Question about 1988 Ford F 150

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I have a 1988 F150 with a 302, the truck has a hard time finding a Idle

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.

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  • 8 Answers

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

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SOURCE: 2004 ford f150 idle goes up and down also when you

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

  • 295 Answers

SOURCE: 1989 ford f150 w/ 5.0 liter..... engine light on

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

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SOURCE: i have a 1988 ford bronco full size xlt it is ideling low when u

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

  • 116 Answers

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

  • 439 Answers

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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2 Answers

I have a 1988 Ford F150 it idles at around 2500. It started this after I broke the pvc vacuum lines and fixed them with rubber hoses. Would this be a cause for the high idle??


sounds like u still have vacum leak to me take a can of carb cleanor an spray around your repares it will idle even higher when u find it good luck

Jan 13, 2011 | 1988 Ford F 150

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Hi i have a 1988 ford f150 it idles up and down and always smells like gas also when you floor it or tap the gas after idling for a while black smoke comes out the tail pipes. i'm so sick of it running...


Check fuel pressure regulator by removing the vacuum hose. If idle does not change or fuel comes out of regulator replace it. Otherwise check your injectors one at a time while car is running. If idle does not change replace it.

Oct 13, 2010 | 1988 Ford F 150

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1988 ford f150 302: heavy hesitation.


Check engine light? Have you checked fuel pressure?

Apr 06, 2010 | 1988 Ford F 150

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1988 ford f150 302/5.0 starts but wont idle


The 02 sensor may have been damaged by the bad converter. If car was running rich it could have caused converter failure also.

Jun 13, 2009 | 1988 Ford F 150

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High idle all the time on a 1988 5.0 litre engine in a f150


lift hood while running and lisen for a vacum leak and check all vacum hoses. if you dont find a vacum leak then replace the idle air cotrol valve. if the check engine light is on then make sure the code is not for the throttle position sensor. if so then replace the throttle position sensor.

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psable intack manifeld gascet leak

Mar 13, 2009 | 1988 Ford F 150

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Too fast idle


what can be happening and is a common issue is that the pedal return spring on the throttle body (linkage) gets weak over the years it happened to mine 2 months ago so u just want to make it tighter by winding it around one more time and lubricate the whole linkage

Jul 25, 2008 | 1988 Ford F 150

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