DENSO Auto Parts 5026 spark plug for the 1975-1979 Ford F-150 V8 7.5L, the 1975-1984 F-150 V8 5.0L, the 1977-1979 F-150 V8 6.6L, the 1977-1983 F-150 V8 5.8L and other vehicles ignites the air-fuel mixture in the combustion chamber. It is an OE-grade plug.
- Patented U-Groove ground electrode gives a larger flame front and improved ignitability
- Copper core center electrode for thermal conductivity
- Nickel tip on the center electrode and a nickel ground electrode core
- Tapered seat with a 14 mm thread diameter and 11.6 mm reach
Quick facts
- Part: DENSO Auto Parts 5026 spark plug
- Fits: the 1975-1979 Ford F-150 V8 7.5L, the 1975-1984 F-150 V8 5.0L, the 1977-1979 F-150 V8 6.6L, the 1977-1983 F-150 V8 5.8L and other vehicles
Hard starting, a rough idle or a misfire can mean the plugs are worn. Ignition wires, a weak coil or a fuel delivery fault can be behind those signs as well, so find the cause before you buy plugs.
Fits
A wide range of V6 and V8 engines take this plug. It also fits as spark plugs for the 1975-1979 Ford F-250 V8 7.5L and the 1984 Ford Mustang V8 5.0L, and each of those V8s takes eight. If your vehicle is not named here, look up its year, model and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Thread diameter: 14 mm
- Reach: 11.6 mm
- Hex size: 16 mm
- Seat type: Tapered
- Heat range: 16
- Pre-gap: 1.1 mm
- Quantity per vehicle: 8 on V8 engines, 6 on V6 engines
Build and materials
- Ground electrode tip design: U-Groove
- Center electrode: copper core, nickel tip
- Ground electrode core: nickel
- Resistance: 5000 ohms
- Country of origin: China
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Does the DENSO Auto Parts 5026 spark plug fit the 1977-1983 Ford F-150 V8 5.8L?
Yes. DENSO Auto Parts 5026 is listed for the 1977-1983 Ford F-150 V8 5.8L, which takes eight plugs. Other vehicles are in the "Vehicles it fits" section.
Is this a spark plug for the 1984 Ford Mustang V8 5.0L?
Yes. DENSO Auto Parts 5026 fits the 1984 Ford Mustang V8 5.0L, and that engine takes eight plugs.
What thread size and reach does the DENSO Auto Parts 5026 spark plug have?
DENSO Auto Parts 5026 has a 14 mm thread diameter, 11.6 mm reach, 16 mm hex and a tapered seat. It comes pre-gapped to 1.1 mm.
Can a worn spark plug lead to hard starting or a rough idle?
Yes, a worn plug can be one source of hard starting, a rough idle or a misfire. A shop can test the ignition system if the signs continue after new plugs.
What materials are used in this DENSO Auto Parts spark plug?
The center electrode has a copper core with a nickel tip. The ground electrode has a nickel core and the U-Groove design.
