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by myizdilly on January 31st, 2007

myizdilly

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I have a 2001 ford f150,4.2l,v6 with 100000 miles.Tuned up and still has a spark knock which will go away with hi test gas. can't adj. timing so what to do? Should run on reg. gas.

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Answers. 4 helpful answers below.

  • by 8 Jan 2004-10 Dec 2009 on February 13th, 2007

    8 Jan 2004-10 Dec 2009

    One other thing that sometimes works is just resetting the ECU. This can be as simple as pulling the fuse for a few minutes. On many cars, this resets the spark timing to a conservative setting which may be just enough to solve your problem.

    Be warned that this doesn't always work though.

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  • by lizard_king_21 on February 12th, 2007

    lizard_king_21

    you could try a motorvac. cleans the fuel system and cleans all carbon deposits from the engine.
    carbon buildup can cause pinch points in the cylinders which will ignite the fuel before its supposed to which can cause piston slap. gasoline can ignite without spark if compressed enough. low octane gas is more prone to this than higher octane. so switching to a higher octane solves your problems.

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  • by hotrodadam on September 11th, 2011

    hotrodadam

    The problem is a broken clip on the intake manifold runner control, I'd bet money. The intake is designed like many others with a long runner (for low-end torque) and a short runner (for increased top end performance) so that the engine benefits from both runner designs. There is a "butterfly" (flap) in each runner that opens at a predetermined rpm and the air takes the short runner. the problem is the pcv system is so poor on these engines that the intake runners become contaminated from oil mist that is redirected into the engine and causes a buildup that limits the movement of these valves. The linkage attemps moving the valve against the resistance of this buildup and eventually the weak link (which is the plastic bushing holding the linkage into the valve actuator) breaks from force and being brittle from heat. The engine then operates on the long runner but is designated a fuel parameter by the pcm designed for the short runner and will cause detonation that can potentially cause severe engine damage. The oil buildup in the the runner also causes the port to reduce its size which causes a bottleneck effect of the incoming air and causes a rich condition, which is quickly offset by the pcm with a fuel reduction, thus causing a lean condition. Also the oil mist entering the cylinder will cause a preignition condition, so there are many factors that contribute.

    Solution? Remove the intake (upper, middle, and lower), clean the intake(s), clean cylinder head ports, replace imrc linkage bushings, and replace pcv valve!

    TIP: Do NOT buy the ford pcv valve that costs $70! Remove the clip that holds the coolant tube to the pcv valve, go to the part store and match it up (standard pcv valve w/90* fitting) and reinstall coolant tube on it. It'll save you about $67..

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  • by hotrodadam on September 11th, 2011

    hotrodadam

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