Hey Guys. I normally hang out in the 67-72 truck section but I'm having trouble with my 2003 Harley F150. It has Diablo programer,s/c power pulleys,12# boost,throttle body,C&L air duct,and Cold air intake. These have all been in it for years. Nothing changed except maybe the gas here in Phoenix Arizona. It does seem to be better with Chevron.
Driving home from work it is normal at first. After maybe about 10 miles it starts spark knocking under load up a grade. The farther I drive it, it spark knocks easier. By the time I get home 30 miles from work it will spark knock even on a level city road if I lug it in overdrive and accelerate like passing a car. The funny thing is that if I stop and get gas it reverts back to normal on the drive home. No codes in PCM. I had a tech here at the Ford dealer I work for read my PCM. It says everything normal and the knock sensors are working. Any Ideas?
Trucks aren't Cool unless the tailgate handle swings..........
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