Question about 1999 Ford Expedition

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Engine stalls New plugs, new fuel filter, all coil packs and injectors check good with the olms test. Starts good and idles good at first then stalls or idles very low rpm. On the highway it has great pick up but as I slow down it stalls. Its at it's best at 65 mph. Better gas mileage now but still has a miss too.

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  • Larry Koprivec
    Larry Koprivec Jun 20, 2009

    Can't get help Paid 20.00 Live dos not work Just Got Riped Off

  • Larry Koprivec
    Larry Koprivec Jun 20, 2009

    Live Help

  • johnny wyatt
    johnny wyatt May 11, 2010

    Even if you replaced the fuel pump it was probably made in china. I had to replace my trucks fuel pump 3 times in a year cause they were made in china and did not do the job.

  • johnny wyatt
    johnny wyatt May 11, 2010

    Did you check fuel pressure at the fuel rail? Should be 30 psi to start. Low fuel pressure will also cause a miss fire at the plugs.

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The throttle position sensor has a small amount of adjustment in it. The plastic case has a slight slot in it. On the opposite side of the TPS on the air horn you will see a throttle stop with a hard to move screw. You need to get some play on that screw to have slack to adjust the TPS. I think it was good for 100+rpm at base idle.
This may help you, but check you EGR for diaphram and carbon buildup.

Posted on Jun 28, 2009

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Check the pcv vale going in to back of intake it may be broke or has a hole in it .this has happend on quite a few i worked on .this is one of fords better ideals .the part at advance auto parts is 18.00

Posted on Mar 01, 2010

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