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If your 1999-2006 GMC Sierra 1500 is showing hard starts, rough idle, or intermittent misfires, the ignition coils are a likely suspect. Choosing the right ignition coil matters because coils must match the Silverado generation's electrical requirements and engine mounting to deliver consistent spark and avoid further ignition system damage. This guide covers the top shortlisted ignition coils that are suitable for the 1999-2006 Sierra 1500, explains the practical reasons to replace a coil, and highlights the evaluation criteria we used.Below you will find our selected options and the testing and fitment factors that matter most for this truck, followed by troubleshooting and DIY guidance to help you decide which coil to install next.
Looking for other parts? See all GMC Sierra 1500 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | ENA Set of 8 Round Ignition Coils (UF262) for 1999–2006 Silverado/Sierra 5.3L & 6.0L |  |
| Best Quality Built to a higher standard if you want something more solid | Delphi GN10165 Ignition Coil |  |
| Best Value The sweet spot between price and what you get | ENA Square D581 Ignition Coils Set (replaces C1208/D581) |  |
| Best Budget The cheapest option that still gets the job done reliably | DRIVESTAR UF271 Ignition Coil Pack (replacement) |  |
| Highest Rated A top-rated pick with lots of positive feedback | ENA 1-Round Ignition Coil Pack for V8 5.3/6.0 |  |
| Most Popular A crowd favorite that many people choose with confidence | DRIVESTAR UF262 Ignition Coil (vehicle-specific fit) |  |
| Best Seller A high-volume bestseller chosen again and again | HQPASFY UF262 Ignition Coils with Iridium Spark Plugs and Wires — Set of 8 (Round Coils) |  |
1. ENA Set of 8 Round Ignition Coils (UF262) for 1999–2006 Silverado/Sierra 5.3L & 6.0L
| Terminal Quantity | 4 |
|---|---|
| Mount Type | Bolt On |
| Mounting Location | Valve Cover |
| Voltage | 12V |
These ENA coils are sold as a full set of eight round UF262-style ignition coils designed to replace worn units on 1999–2006 GM 4.8L, 5.3L and 6.0L V8 engines. Installation is straightforward because they are bolt-on, valve-cover mounted units that match the factory electrical connector and mounting layout for the round type. In use they restore a consistent spark and resolve common misfire symptoms when the original coils are failing, and buyers report easy installation and improved running on older trucks. The kit includes all eight coils and is packaged to protect the parts in transit. Expect the benefit of replacing every coil at once to eliminate intermittent misfires and rough idle without swapping parts to diagnose. Possible downsides are mixed long-term reliability reports from some users and occasional minor fitment/bolt-hole alignment issues on certain model years that may require attention during installation. Overall this is a practical, cost-conscious replacement when you need a complete coil set for the covered GM V8 applications.
Best for: Drivers who want a complete, affordable replacement to fix misfires and restore smooth running on late 1990s to mid-2000s GM V8 trucks and SUVs and prefer replacing all coils at once rather than diagnosing individual units.
Less Ideal for: Those seeking an exact factory-branded or high-end performance coil with extended proven longevity or buyers who only need a single coil for occasional use.
- Full set of eight coils provided so all cylinders can be renewed at once
- Bolt-on design with factory-style connector simplifies installation
- Engine-specific fit for many 1999–2006 GM V8 trucks and SUVs
- Packaging protects components during shipping
- Some buyers report inconsistent long-term durability compared with factory parts
- A few vehicles required minor adjustment for mounting hole alignment
Verdict: A budget-friendly, vehicle-specific eight-coil kit that makes replacing all ignition coils at once a convenient way to eliminate misfires on 1999–2006 GM V8 trucks and SUVs.
2. Delphi GN10165 Ignition Coil
| Brand | Delphi |
|---|---|
| Installation Type | coil pack |
| Position | Front, Rear |
| Model | ignition coil |
| Manufacturer Part Number | GN10165 |
The Delphi GN10165 is a direct-fit ignition coil designed as a vehicle-specific replacement for front or rear cylinder positions. It delivers the high-voltage spark generation that restores proper ignition when a worn coil causes misfires, rough idle, or reduced power. Delphi emphasizes manufacturing controls such as longer winding lengths, epoxy vacuum filling, and durable wire coatings to reduce breakdown and energy punch-through. In practice the coil installs like a factory part and fixes misfire-related drivability problems quickly. Buyers report straightforward installation and consistent performance across street and light-duty truck applications. Limitations to note are that this is a single coil unit sold to match specific fitment rather than a full kit, and longevity depends on installation conditions and engine environment; it does not include spark plugs or boots. For a performance-oriented Sierra, replacing failing coils with a quality factory-replacement like this restores throttle response and smoothness without engine tuning or other upgrades.
Best for: Drivers who want a reliable, factory-quality replacement to eliminate misfires and restore engine response on a street-driven Sierra without modifying ignition timing or engine management.
Less Ideal for: Those seeking a complete ignition overhaul or performance-tuned coils with higher output; also not ideal if you need a multi-pack replacement in a single purchase.
- Factory-quality construction aimed at reducing insulation breakdown
- Epoxy vacuum filling reduces air bubbles for better insulation reliability
- Direct-fit, vehicle-specific design for easy installation
- Reported to resolve misfires and restore smooth engine operation
- Sold as an individual coil so purchasing multiple cylinders requires buying additional units
Verdict: A reliable factory-style replacement coil that fixes misfires and restores smooth performance for a performance-minded Sierra driver.
3. ENA Square D581 Ignition Coils Set (replaces C1208/D581)
| Compatible engines | 4.8L, 5.3L, 6.0L (listed) |
|---|---|
| Installation type | Screw-In |
| Connector gender | male |
| Manufacturer part number | ENAIC350808 |
These ENA square ignition coils are a direct-style replacement for several GM part numbers and are sold as a multi-pack for V8 engines used in full-size trucks and SUVs. They install like factory coils using the screw-in connector and the male electrical plug, so they are typically swapped in during a tune-up or to cure misfires. Customers report the coils eliminate rough idle and misfire codes on 4.8L, 5.3L, and 6.0L engines when the original coils fail. The package includes multiple coils and the units feel solid in hand, which helps when working in tight engine bays. Limitations are that fit depends on matching the square coil shape and part number compatibility, so confirm the vehicle application before buying, and lifetime warranty terms may require proof of installation or purchase channel for a claim. These are a budget-friendly alternative to factory replacements for owners who want a practical, serviceable fix without paying dealer prices.
Best for: Buyers who prioritize a cost-effective, straightforward repair to restore engine smoothness on older GM V8 trucks and want a practical replacement they can fit during a routine tune-up.
Less Ideal for: Do not choose this if you need coils for non-square designs, if you prefer branded dealer parts for warranty convenience, or if you require performance-upgraded ignition components for modified engines.
- Direct-replacement design for common GM V8 coil locations simplifies installation
- Sold as a multi-pack so you can replace all faulty coils at once
- Screw-in installation and standard male connector match factory wiring
- Many buyers report immediate improvement in idle smoothness and elimination of misfires
- Requires verifying square-coil form factor and part number to ensure proper fitment
Verdict: A practical, budget-friendly multi-pack replacement that reliably fixes misfires on late 1990s–mid 2000s GM V8 trucks when the square coil form is required.
4. DRIVESTAR UF271 Ignition Coil Pack (replacement)
| Manufacturer | DRIVESTAR |
|---|---|
| Manufacturer Part Number | UF271 |
| Fitment years/vehicles | 1999–2007 GM trucks and SUVs (listed models) |
This DRIVESTAR UF271 ignition coil pack replaces a single factory coil to restore spark delivery on compatible GM V8 applications. It is used as a direct replacement when a misfire or check engine light points to a failed coil; installation is a straightforward swap at the coil tower and works with existing spark plugs and wiring. The listing highlights high-temperature wire and corrosion-resistant construction, which in practice means the coil should tolerate engine heat and deliver a consistent, strong spark for smoother idle and improved throttle response. Buyers should note this is a single coil pack unit intended to replace one failed coil rather than a multi-coil set, so multiple failed cylinders will require additional units. Fitment is specific to the Chevy/GMC/Tahoe/Suburban/Avalanche/Hummer model years listed, so confirm vehicle match before purchase. Overall the part gives a practical, budget-friendly way to clear misfires and return engine performance without modifying the ignition system.
Best for: Drivers repairing a single misfiring cylinder on older GM trucks who want an affordable, direct replacement that reinstates factory-style ignition performance without extra tuning or upgrades.
Less Ideal for: People needing a full multi-coil replacement kit or those looking for performance aftermarket coils designed for increased output or racing use.
- Direct one-to-one replacement for listed GM V8 vehicles
- High-temperature tolerant internal wiring for reliable spark under heat
- Corrosion-resistant construction helps longevity in engine bay conditions
- Sold as a single coil so replacing multiple failed coils requires multiple purchases
Verdict: A cost-effective single-coil direct replacement that reliably restores spark and clears misfires on the specified GM V8 trucks and SUVs.
5. ENA 1-Round Ignition Coil Pack for V8 5.3/6.0
| Automotive Fit Type | Vehicle Specific Fit |
|---|---|
| Connector Gender | female |
| Installation Type | Plug In |
| Part Interchange Info | Replaces C1251, D585, UF-262 and other equivalents |
This ENA single round ignition coil is a direct plug-in replacement built for V8 GM applications and intended to clear misfires and restore normal starting and running. Installation is straightforward since it uses the factory-style connector and two-bolt mounting so most mechanically inclined owners can swap a bad coil in minutes. The listing notes copper windings and a design targeted at low emissions and high energy output, which translates to consistent spark delivery, fewer hard-starts, and improved throttle response on affected cylinders. Buyers report it fits the specified model years and engine sizes with no modification required. Limitations are typical of aftermarket coils: longevity can vary with operating conditions and it replaces only one coil so multiple failures may require buying extras; for persistent electrical or fuel-system faults a coil swap will not resolve underlying issues. If you need a simple, vehicle-specific coil to eliminate a cylinder misfire and get a truck back to reliable running, this part performs that role effectively.
Best for: Owners who prioritize restoring dependable engine performance quickly and want a straightforward replacement coil that fits directly into specified GM V8 trucks without extra modification.
Less Ideal for: Buyers seeking a lifetime performance upgrade or hardened racing ignition components should consider performance-grade coils or professional diagnostic services for non-ignition faults.
- Vehicle-specific plug-in design for an easy, no-modification installation
- Factory-style connector and two-bolt mount for secure fitment
- Copper windings and high-energy output aimed at restoring consistent spark
- Targets common symptoms like misfires, hard starts, and poor fuel economy
- Aftermarket durability can vary and may not match higher-end factory replacement lifespan
- Sold as a single coil so replacing multiple failing coils requires additional purchases
Verdict: A simple, vehicle-specific coil replacement that reliably restores spark and clears common misfire symptoms on affected 1999–2006 GM V8 trucks.
6. DRIVESTAR UF262 Ignition Coil (vehicle-specific fit)
| Manufacturer Part Number | UF262 |
|---|---|
| Connector Gender | Male |
| Automotive Fit Type | Vehicle Specific Fit |
| Installation Type | Bolt-On |
The DRIVESTAR UF262 is a single replacement ignition coil intended as a direct bolt-on for many GM V8 applications from the 1999–2006 era. It delivers the ignition spark control needed to correct misfires, hard starts, rough idle, and hesitation caused by a weak coil. Installation is straightforward for anyone comfortable with basic engine work since it uses the factory-style connector and bolts into place. The part is built with heat- and vibration-resistant insulation and a flexible shaft to ease fitment in tight engine bays. In real-world use buyers report immediate improvement in smoothness and drivability after swapping faulty coils, and many users highlight easy fit and solid value compared with dealer parts. Keep in mind this is an aftermarket single-coil replacement rather than a factory module; longevity can vary with driving conditions and maintenance, so expect typical aftermarket variability versus higher-cost factory-quality units.
Best for: Buyers who want a straightforward, budget-conscious replacement to fix misfires and restore drivability on compatible late 1990s–2006 GM V8 trucks and SUVs, and who value proven user feedback when choosing parts.
Less Ideal for: If you prioritize factory-brand longevity or need a multi-coil assembly rather than a single replacement coil, consider dealer or premium-brand alternatives or a full coil pack service.
- Vehicle-specific bolt-on design for direct replacement on listed GM V8 engines
- Factory-style male connector for plug-and-play installation
- Insulation and materials rated for high heat and vibration to resist common failure modes
- Many buyers report immediate reduction in misfires and smoother running after installation
- Aftermarket unit so long-term durability may be less consistent than higher-cost factory-quality coils
Verdict: A practical, user-validated bolt-on replacement coil that reliably clears misfires and restores daily drivability on compatible 1999–2006 GM V8 trucks and SUVs.
7. HQPASFY UF262 Ignition Coils with Iridium Spark Plugs and Wires — Set of 8 (Round Coils)
| Part Interchange Info | UF262 |
|---|---|
| Installation Type | Coil-near-plug |
| Compatible with Vehicle Type | Truck, Van |
| Connector Gender | male |
This HQPASFY kit combines eight coil-near-plug ignition coils with iridium spark plugs and plug wires to provide a one-stop tune-up for compatible GM V8 trucks and vans. It is intended for vehicles that use the round Delphi-style coil (UF262 interchange) and arrives as a vehicle-specific replacement set. In typical use the kit replaces aging or failed coils and worn plugs/wires to restore smooth idle, eliminate misfires, and improve starting and throttle response. Notable features include factory-style coil fitment, iridium plugs for longer life and better spark consistency, and plug wires included so you can replace the whole ignition circuit at once. Practical benefits are reduced troubleshooting time, a coordinated parts match, and a relatively simple install for anyone comfortable with basic engine work. Limitations: the listing warns it does not fit square Mitsubishi-style coils and fitment must be confirmed by part number, and a few buyers reported missing components in some orders so check the package on arrival.
Best for: Buyers who prioritize a low-risk, complete ignition tune-up and want a factory-style replacement set that restores smooth running without sourcing individual components.
Less Ideal for: Those who prefer branded OEM parts, need coils for Mitsubishi-style square coils, or want to replace only a single failed coil rather than the entire set.
- Complete tune-up kit includes coils, iridium spark plugs, and plug wires for a coordinated replacement
- Designed to match UF262 round Delphi-style coil fitment for direct installation
- Iridium spark plugs offer longer service life and more consistent spark than standard plugs
- Coil-near-plug design simplifies installation and reduces need for additional adapters
- Does not fit vehicles with square Mitsubishi-style coils, so cross-check part number before buying
- Some customers reported receiving coils without the listed plugs or wires indicating occasional packaging issues
Verdict: A convenient, vehicle-specific full ignition tune-up kit that restores smooth running for GM V8 trucks using round Delphi-style coils.
Choosing the Right 1999-2006 GMC Sierra 1500 Ignition Coil: Key Factors to Consider
Electrical Compatibility and Resistance Specs
Matching the coil's primary and secondary resistance ranges to the factory specifications is crucial because incorrect resistance affects spark intensity and can trigger misfires. For the 1999-2006 Sierra 1500, coils must operate within the ignition module's expected electrical load so the module does not overwork or shut down under thermal stress.
When assessing replacement coils, confirm the published ohm values for primary and secondary windings and compare them to the OEM service information. Also check the coil's spark energy rating or voltage handling if available, since higher-heat or high-mileage engines often benefit from coils that tolerate higher secondary voltages without breakdown.
Physical Fitment and Mounting
Proper physical fitment prevents installation headaches and ensures the coil seats securely on the engine and spark plug or bolt-on wire connections. On the Sierra 1500, mounting locations are tight and connectors vary by engine and ignition pack style, so a replacement must match bolt patterns, connector types, and boot lengths.
Incorrect boot length or misaligned mounting can cause poor contact, arcing, or oil contamination of the coil interface. Verify the replacement's mounting hardware, electrical connector orientation, and clearance around nearby components, especially on V8 and V6 engine variants within the 1999-2006 model years.
Thermal Durability and Materials
Under-hood temperatures in the Sierra 1500 can be high, particularly during towing or extended idling. Coils built with robust housings, high-temperature potting compound, and heat-resistant boots resist cracking and internal insulation breakdown. Thermal durability directly affects longevity and lowers the chance of heat-related intermittent failures.
Look for materials and construction details that indicate resistance to oil, road grime, and heat cycling. Durable boots and reinforced terminals reduce service calls and prevent ignition coil troubleshooting that stems from deteriorated external components rather than internal windings.
Moisture and Contamination Resistance
Oil leaks, road splash, and condensation can degrade a coil's insulation or cause tracking that leads to misfire. For a working truck like the Sierra 1500, choose coils with well-sealed housings and sealed boots that keep moisture and contaminants away from high-voltage paths.
Seals and protective boot designs also affect long-term reliability. Coils that are easier to clean or that use vapour-tight molding reduce the likelihood of ignition coil symptoms misfire caused by external contamination rather than internal failure.
Ease Of Installation and Serviceability
Many Sierra 1500 owners will tackle ignition coil replacement themselves. Coils that use factory-style connectors, clear mounting points, and standard torque specifications keep a DIY replacement straightforward. Installation ease reduces the chance of installation-induced issues such as over-tightening, misrouting wires, or using incorrect fasteners.
Also consider whether the coil allows for individual replacement or requires replacing a pack assembly. The ability to replace only the failed unit lowers repair time and simplifies ignition coil replacement on the vehicle.
Reliability, Warranty, and Support
Reliability history and warranty terms provide a safety net for parts that must withstand daily driving and towing. Coils with visible quality control, longer warranty periods, and accessible technical support can reduce downtime for Sierra 1500 owners who rely on the truck for work or recreation.
Check whether the supplier provides installation guidance or part number cross references and whether technical documentation includes basic ignition coil troubleshooting steps. These support elements help owners identify the real cause of symptoms and ensure replacement coils last as expected.
Common Symptoms and How They Present on Your Sierra 1500
Ignition coil issues on a 1999-2006 GMC Sierra 1500 commonly show up as intermittent misfires, rough idle, hesitation on acceleration, or a noticeable drop in fuel economy. Symptoms often appear under load or when the engine is hot because heat accelerates insulation breakdown inside the coil.
In some cases the truck may start normally but then run unevenly after warming up. Owners may also see a check engine light with codes that point to cylinder misfire or coil primary/secondary circuit faults. Recognizing these symptoms early can help avoid secondary damage to ignition wires, spark plugs, and catalytic converters.
- Hard starts or no-start conditions intermittently when hot
- Rough idle or engine surging at low speeds
- Single-cylinder misfire codes and uneven power delivery
- Degraded fuel economy and inconsistent throttle response
Basic Troubleshooting Steps Before You Replace a Coil
Start with a visual inspection of coil boots, connectors, and wiring. Look for cracked boots, oil contamination, loose connectors, or corroded terminals that can mimic internal coil failure. Cleaning or reseating connectors sometimes resolves intermittent faults.
Next, swap suspected coils between cylinders when feasible to see if the misfire follows the coil. This helps determine whether the problem is the coil or another component such as the spark plug or injector. Always follow safe engine-off procedures and label any parts you remove to ensure correct reinstallation.
- Inspect boots and connectors for cracks or oil
- Swap coils between cylinders to check if misfire follows
- Check spark plugs and ignition wires for wear
- Scan trouble codes and record patterns before replacing parts
How To Test Ignition Coils on a Sierra 1500
A multimeter can verify basic coil resistance values, which is a practical first test. Measure primary and secondary resistance on the removed coil and compare the readings to the vehicle-specific ranges listed in service documentation. Keep in mind that a coil can pass a static resistance test yet fail under load, so resistance checks are a screening tool rather than a definitive test.
For a more conclusive check, a dynamic test using a spark tester or oscilloscope shows how the coil performs under load. Observe the spark pattern and strength while the engine is cranking or running. If you do not have specialized tools, documented swap tests combined with resistance readings provide strong diagnostic value for most DIYers.
- Use a multimeter to measure primary and secondary ohms
- Perform a swap test to see if misfire follows the coil
- Use a spark tester for dynamic load checks when possible
- Document every test result to avoid repeated troubleshooting
Plug and Maintenance Tips to Extend Coil Life
Regular spark plug inspection and replacement at the recommended intervals reduces the electrical load on coils. Worn or incorrectly gapped plugs increase the voltage required for a stable spark and accelerate coil wear. Use the correct plug type and gap setting for your engine to maintain efficient ignition performance.
Keep the engine bay free of oil and coolant leaks that can contaminate coil boots and housings. Address valve cover gasket leaks, excessive PCV issues, and any sources of fluid ingress promptly. Clean connectors and apply dielectric grease sparingly to improve moisture resistance and maintain a reliable electrical connection.
- Replace spark plugs to factory intervals and correct gap
- Repair oil or coolant leaks that can contaminate coils
- Clean electrical connectors and apply dielectric grease
- Avoid prolonged high-idle and overheating conditions
Part Number Cross-Referencing and Documentation
When sourcing a replacement ignition coil for the 1999-2006 Sierra 1500, confirm part numbers and cross-references to ensure correct fitment. Service manuals and parts catalogs list OEM part numbers along with compatible aftermarket references. Using accurate documentation reduces the chance of purchasing a coil with mismatched electrical or mounting characteristics.
Keep copies of service specifications, resistance ranges, and connector diagrams on hand during the selection and installation process. Clear documentation accelerates troubleshooting and ensures any replacement coil meets the truck's original equipment requirements.
- Verify OEM part numbers and aftermarket cross-references
- Check connector types and boot orientation in diagrams
- Keep resistance specs to compare with measured values
- Record installed part numbers for future reference
Still looking for the perfect fit?
Select your GMC Sierra 1500 configuration to see the most relevant Ignition Coils recommendations
How We Chose the Best 1999-2006 GMC Sierra 1500 Ignition Coil
We focused on criteria that matter specifically for the 1999-2006 GMC Sierra 1500 platform and its common ignition system failures. Primary evaluation factors included electrical compatibility with the truck's ignition module and recommended primary/secondary resistance ranges, physical fitment and mounting alignment for the factory coil locations, build quality of the coil housing and high-voltage boots to resist heat and oil exposure, and reliability indicators such as reported lifespan and warranty terms. We also considered ease of installation for owners who want a straightforward replace ignition coil DIY experience, and documented troubleshooting support such as clear wiring diagrams or part number cross-reference information.Products were excluded if they lacked explicit fitment data for 1999-2006 Sierra 1500 applications, provided incomplete electrical specifications, or used nonstandard mounting designs that require modification. We prioritized coils that balance durability and straightforward fitment without requiring additional harness adapters or control module changes. Final choices reflect a balance between correct electrical performance, robust physical construction, and practical serviceability for this truck.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the most common signs that an ignition coil is failing on my Sierra 1500?
Common signs include intermittent misfires, rough idle, hesitation during acceleration, and a check engine light with misfire-related codes. Symptoms often worsen when the engine is hot because heat accelerates coil degradation.
Can I test an ignition coil with a multimeter at home?
Yes, a multimeter can check primary and secondary resistance to screen for obvious faults. However, a coil can pass a resistance test and still fail under load, so consider swap tests or dynamic spark testing for a more conclusive diagnosis.
Is it necessary to replace spark plugs when replacing an ignition coil?
It is often recommended to inspect and, if worn, replace spark plugs when changing a coil. Worn or improperly gapped plugs increase the electrical demand on coils and can shorten their service life.
How do I know if the misfire is caused by the coil and not the spark plug or injector?
A useful approach is to swap the suspect coil with a coil from another cylinder and see if the misfire follows the coil. Also check spark plugs and injector function. Patterns in diagnostic trouble codes and consistent swap test results indicate the likely culprit.
Are there maintenance steps that help prevent coil failure on the Sierra 1500?
Yes. Keep spark plugs serviced to correct intervals, address oil or coolant leaks promptly, clean and protect electrical connectors, and avoid extended high-heat operating conditions. These steps reduce stress on coils and extend service life.
What should I do if a replacement coil still causes a misfire after installation?
Re-check fitment, wiring, and connector seating first. Confirm the replacement matches the truck's part number and resistance specs. If problems persist, inspect related components such as spark plugs, ignition wires, and the ignition control module for faults.
Final Verdict
Prioritize correct electrical compatibility and secure physical fitment when selecting an ignition coil for your 1999-2006 GMC Sierra 1500. Thermal durability, sealed boots, and documented resistance values reduce the risk of repeat failures and make installation more reliable. Balance ease of installation with materials and support so you can address symptoms efficiently.When in doubt, choose the option that best matches the truck's original specifications and offers clear documentation. That approach minimizes troubleshooting time and helps you get back on the road with confident starting and smooth running.
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