1990 f150 4x4 problem

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Jun 26, 2004 | 12:01 PM

ilbigmike

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Joined: Apr 2001

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From: Buffalo Grove,il

1990 f150 4x4 problem

I have a 302 with 107,000 on it and I am having a problem.... it has been idling rough for awhile and I have just replaced the idle air motor assy...it had been idling at either 500 or 2500-3000 ..now idles okay, rough running in gear at around 2500 rpm...it seems to surge a little the the rpm fluctuates and the check engine light comes on....could it be the tps? it seems to not blow black sooty smoke out,so I do not think it is the o2 sensor...Any help would definitely be appreciated......mike, illinois

Jun 26, 2004 | 12:46 PM

prcrboy

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Joined: Feb 2004

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if it throws the light, have you pulled the codes to see what it says? If you can't do it yourself, have autozone do it for you.

O2 sensor wouldnt cause that, and yes very well could be tps.

Jun 26, 2004 | 02:20 PM

ilbigmike

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Joined: Apr 2001

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From: Buffalo Grove,il

Unfortunately,I do not have a reader...I am going to ask around to see if any of my neighbors or friend has one... thanks for the input!!!

Jun 26, 2004 | 02:36 PM

prcrboy

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That model you dont need the reader. YOu can short the dianostic connector and read the idiot light. Look under the technical sticky on the ranger forum. It has a great description on how to pull with meter or light. it also lists most of the codes. ITs under the emmsions heading of the techincal posts.

https://www.ford-trucks.com/forums/s...d.php?t=107538