Question about 1988 Ford F 150
I have a 1988 ford f150 with a 302. The truck will start and run, but the idle goes up and down when parked. While drving it run ok but when you come to a stop it might still because it doesn't idle correctly.
Many idling problems such as yours can be resolved by simply having the car tuned up ie , new air filter, change all spark plugs, oil change, etc... you'd be surprised by the outcome! Good luck.
Posted on Jul 11, 2013
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Posted on Jan 02, 2017
hi, i would venture to say that you have an air leak somewhere, ie; a split in a vacumn hose or the like check all your hoses on the intake side for bad fit or splits. hope this helps, thanks for useing fixya!
Posted on Feb 21, 2009
I would check the oil pressure of the engine. The reason is the timing chain tensioners are run with oil pressrue. I think your timing chain tensioners are leaking down when engine is getting to operating tempature . The oil is thinning down as warms up , as it should to lubercate . I would check compression and do a cylinder leak down test on all the cylinders. Then if the compression is good and the cylinder leak down is good. I would change all the timing components, ( chain, timing gears, timing chain tensioners )
Good Luck , I hope this helps.
Posted on Apr 18, 2009
I just had the same issue with my 88 xlt w/351 W it wound up being the MAP sensor and the timing. I would check both of these and see if it solves your issue.
Posted on Apr 23, 2009
SOURCE: 87 Ford F150 idles too fast
either a vacuum leak or an idle air control valve problem most likely.the iac is on the side of the throttle body.cylinder shaped with a small harness.
Posted on Jun 12, 2009
SOURCE: 1988 Ford Crown Vic Strange Idle
When you turn the key on does the check engine light come on? If not it may be burned out. It sounds like a MAP sensor or an O2 sensor is bad. I would suggest taking it to autozone as they do free diagnostic and seeing if a code comes up. If it is a sensor it should, if not it may be the idle sensor not reading right in the ECU. More than likely it is one of the sensors though.
Posted on Jun 23, 2009
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