won't idle on 1999 Ford Expedition

Won't idle after it gets warm.Will crank but won't keep running.

by in Prattsville, AR on May 30, 2011
2 answers 2 comments
ANSWER by on May 30, 2011
Is the Check Engine Light on? If so codes will be stored in the computer of your car and these codes will indicate where the problem most likely lye, (a scan tool will be needed to retrieve the codes using the diagnostic socket under the dash). Vacuum leaks or idle speed control motor are the most likely problem or something that fails because it absorbs engine heat.
COMMENT by on May 31, 2011
yes check engine light is on,it will crank and if i let off the gas it dies.
COMMENT by on May 31, 2011
The check engine light is continually on while the engine is running? Like Patrick said, there will be codes to pull if this is the case. Have a diagnosis performed.
ANSWER by on May 30, 2011
To supplement Patrick - if there is not a check engine light on and there are no codes, a good fuel pressure and volume test should be performed. I have seen several of these trucks that have fuel pump issues. Low fuel pressure usually does not set any codes on this one.
Related Items:
Started out rough idle w/shaking when accelorating then would cut off after I stopped and parked..changed plugs,new IAC value, new temp.censor...now when we crank her up she doesn't stay running lo...
If I try to start the car without pushing the excelerator it won't turn over. I have had the battery checked and it does hold a charge.

Related Content