Put platinum on both sides of the spark gap with the AUTOLITE spark plug APP26, a Double Platinum plug designed to resist gap erosion for a longer service life. It fits many vehicles, among them the 1980 Ford F-150 with the V8-5.8L, the 1984-1985 Ford Mustang with the V8-5.0L and the 1973-1974 Ford F-250 with the V8-7.5L. See the "Vehicles it fits" section for the full list.
- Platinum-to-platinum design: Platinum tips on both the center and ground electrodes are designed to decrease gap erosion and reduce misfires. Autolite says this gives improved durability and a longer service life.
- Yttrium-enhanced ground electrode: Delivers heat transfer intended to add durability under high temperatures and pressure.
- High alumina ceramic insulator: Provides thermal conductivity and dielectric strength. The multi-rib insulator helps prevent flash-over.
- Warranty: Backed by Autolite's 5-year limited warranty.
Specifications: The plug has an M14 - 1.25 metric thread (14 mm), a tapered seat and a 5/8 in hex. It has manufacturer heat range 7 and mid projection. It is a resistor type rated at 4000 ohm resistance, with a non-removable nut terminal. It has a single ground electrode, a copper center electrode core and a nickel ground electrode core. Insulator height is 2.47 in (62.7 mm). It is performance grade, and no washer is included. Country of origin: Mexico.
Sold individually. The number of plugs needed varies by engine, and the "Vehicles it fits" section lists the quantity for each application.
Interchange: 41-905
41905 · CR45TS · R45TS · 19158031 · 88901029
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
41-905, CR45TS, R45TS, 19158031, 88901029
Frequently Asked Questions
Is this the right 1980 Ford F-150 spark plug for the V8-5.8L?
APP26 is listed for the 1980 Ford F-150 with the V8-5.8L engine, which uses eight plugs. Check the "Vehicles it fits" section to confirm your year and engine.
Does the APP26 fit the 1984-1985 Ford Mustang V8-5.0L or the 1973-1974 Ford F-250 V8-7.5L?
It is listed for the 1984-1985 Ford Mustang with the V8-5.0L and the 1973-1974 Ford F-250 with the V8-7.5L. See the "Vehicles it fits" section for other applications.
What does the Double Platinum design do?
Both the center and ground electrodes carry platinum tips. This platinum-to-platinum design is intended to decrease gap erosion and reduce misfires for a longer service life.
What are the key specs of the Autolite APP26?
It has an M14 - 1.25 thread, a tapered seat, a 5/8 in hex, heat range 7, mid projection, a 4000 ohm resistor and a non-removable nut terminal. No washer is included.
What are the signs a spark plug may need replacing?
Common signs include misfires, rough idle, hard starting, hesitation and lower fuel economy. Other ignition or fuel faults can cause these too, so diagnose the cause before replacing plugs.
