Question about Ford E-150

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High idle or shut down when at red light

My 87 van will idle real high when at a stop, then as we are going down the road it will buck. then we have days that it works perfect.

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  • Mike Butler
    Mike Butler May 11, 2010

    Engine, & whether carburetor or fuel injected please?

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  • 24 Answers

Check the exhaust compression. Remove the O2 sensors before the cataylic converts and see if it improves. If it does that means your cats are cloged and need to be replaced.

Posted on Feb 21, 2009

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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.

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