1991 Ford F-150 help

MARYZMAN

MEMBER
1991 FORD F-150
V8
2WD
AUTOMATIC
83,000 MILES

Every time I crank my truck it will die. I can rev in up and quickly pull it in drive to make it drive but for any reason I stop it dies. Before it started dying so much it had a high idling problem but now it wont even idle for running dead. What can I do to fix it?

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
Is the check engine light on?

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Friday, February 5th, 2010 AT 8:14 PM

MARYZMAN

MEMBER
4 POSTS

Yes the check engine light stays on. My girlfriends brother looked at it and he thinks it could be the intake gasget out. He said their is water in the oil and oil in the radiator.

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Sunday, February 7th, 2010 AT 3:19 PM

MERLIN2021

MECHANIC
17,250 POSTS

Jump the two termnals shown together and turn key to "ON" and count the flashes... a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 11 or 111. Write them down and post here. First do this with the key on engine off, then again with it running.
As for the oil abnd antifreeze mixing, this can be either a blown head gasket, cracked head, or cracked block, compression test the engine...
https://www.2carpros.com/dia/how_to_check_compression.htm

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Sunday, February 7th, 2010 AT 7:36 PM