Question about Ford E-150

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Van bucks going down the road. Have changed plugs, fuel pump, ign coil, gas additive, fixed all vacuum leaks, changed tps, mas, etc, ect. van belonged to a self employed mechanic who has had a shop for almost 30 yrs. also idle speed goes up and down.

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  • Ford Master
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Usually "bucking" is caused by ignition. Timing or faulty spark plug wires. They will ildle fine, but when you start driving , the miss firing starts.
First, try aiming a timing light at the crank and see if the marks are jumping around, or staying in one spot. If they are jumping, the timing belt, or chain, depending on what we're dealing with, has jumped a cog.
If not, then try changing the wires.
As for the up and down idling, i would think you still have a vacuum leak. Try dumping some soapy water along the intake gasket while it's running, and see if it bubbles.

Posted on Oct 03, 2010

  • taguebert622 Oct 04, 2010

    intake gaskets were changed already. they were not leaking. van has good power when floored. will throw you back in the seat. plug wires have been changed. everything simple has been done. pcm has not been changed. most mechanics claim 95% of computers replaced do not fix the problem.

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