Question about 1994 Chevrolet C1500

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Trucks starts at a rough idle. After a few minutes idles smoothly then engine check light comes on. Does not come on when first started and when idles rough.. Scratching head here..Any help will be all appreciated and thanks in advance.

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I would check the egr valve first and then the fuel pressure regulator or the idle air control valve

Posted on Nov 19, 2009

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It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

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http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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These details will help.

Thanks.

Feb 04, 2013 | Buick LeSabre Cars & Trucks

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Hi i have a 95 explorer and it will idle fine for awhile then it starts idling rough but if i hit the gas a few times alittle hard it will idle good again but after a minute it will idle rough again p


Check over your work--- you put the problem in it

Did you not make a diagram of the wires before you
removed them & mark the ends of the new ones?

Have to also know the firing order before you start
any job.

Did you gap the plugs correctly

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Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

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