Autolite AP5144 spark plug for the 1998-2008 Ford F-150 V6 4.2L and other vehicles ignites the air-fuel mixture in the cylinder. Autolite platinum spark plugs are built around a platinum center electrode firing tip.
- Platinum center electrode tip for quicker firing and smoother starts, which supports acceleration
- Platinum firing tip that prevents gap erosion for longer service life
- High alumina ceramic insulator for thermal conductivity and insulation strength
- Multi-rib insulator that prevents flash-over
- Nickel-plated shell that is corrosion resistant
Quick facts
- Part: Autolite AP5144 spark plug
- Fits: 1998-2008 Ford F-150 V6 4.2L and other vehicles
- Condition: New
A worn Autolite spark plug can bring hard starts, rough running or a misfire. These signs alone do not prove the plug is the problem, since a weak ignition coil can cause them too.
Fits
Ford, Mercury and Mazda models take this plug. For Ford Ranger spark plugs, it covers the 2006-2008 V6 4.0L, and it also fits the 2000-2004 Ford Focus 4-cylinder 2.0L, which takes four plugs. The 1998-2008 Ford F-150 V6 4.2L takes six. Find your own model and year in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 4 or 6, depending on the engine
- Thread size: M14 - 1.25 (14 mm diameter)
- Hex size: 5/8 in
- Seat type: Tapered
- Heat range: 9
- Pre-gap: 1.4 mm (0.054 in)
- Center electrode projection: Long Projection; insulator tip projection 4.4 mm (0.172 in)
Build and materials
- Center electrode tip: Platinum
- Ground electrode tip: Nickel
- Insulator: Ceramic
- Resistor: Yes
- Terminal: Non-removable nut
- Condition: New
- Warranty: Autolite 4 year limited warranty
- Country of origin: Mexico
In the box
Spark plug only; washers are not included.
Interchange: HR9HP0+ · HR9LPX+
HR8JPP302V · 407 · RS14ZPYC5 · 2U7E12405EA · 6L3E12405AA · AGSF34FP · AWSF24C · AWSF34 · AWSF34C · AWSF34PP · 4104 · 6104 · AGSF34N · AWSF34P · SP440 · SP444 · SP504 · SP506 · PP254D · PP514D
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
HR8JPP302V, HR9HP0+, HR9HP0, HR9LPX+, 407, RS14ZPYC5, 2U7E12405EA, 6L3E12405AA, AGSF34FP, AWSF24C, AWSF34, AWSF34C, AWSF34PP, 4104, 6104, AGSF34N, AWSF34P, SP440, SP444, SP504, SP506, PP254D, PP514D
Frequently Asked Questions
Is the Autolite AP5144 a Ford F-150 spark plug for the 1998-2008 V6 4.2L?
Yes. Autolite AP5144 is listed for the 1998-2008 Ford F-150 V6 4.2L, which takes six plugs. Other vehicles are in the "Vehicles it fits" section.
Is this a Ford Focus spark plug for the 2000-2004 model with the 4-cylinder 2.0L?
Yes. Autolite AP5144 fits the 2000-2004 Ford Focus 4-cylinder 2.0L, and that engine takes four plugs.
What thread size and gap does the Autolite AP5144 have?
The thread is M14 - 1.25 with a 5/8 inch hex and a tapered seat. The plug comes pre-gapped at 1.4 mm (0.054 in).
How can I tell if a platinum plug like this one is worn?
On a plug removed during service with the engine cool, look for a worn-down or damaged tip, cracked ceramic or heavy deposits. Hard starts, rough running or a misfire can also be signs of wear.
Is the AP5144 a resistor plug with a platinum tip?
Yes. Autolite AP5144 is a resistor plug with a platinum center electrode tip and a nickel ground electrode tip.
