Question about 1995 GMC Jimmy

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Rough idle when warm and hard to start - 1995 GMC Jimmy

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  • kmoutzouris Nov 25, 2008

    The problem was fixed by replacing the injecters

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  • 231 Answers

Check the following fuel tanl vent,engine ground,and your coil a it could be weak when it gets hot.

Posted on Oct 10, 2008

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99 ford ranger, idles rough till it warms up,then runs good. Hard to start after it gets hot, it acts as if it is starved for fuel. Once it does crank it runs fine.


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Hard starting, rough idle when cold, then smooth running when warm


Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

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Hard starting and rough idle


The idle valve is the most common problem for hard starting in cold weather. I would recommend having it removed and inspected for contamination. Sometimes they can be cleaned out. If it has heavy carbon buildup, you may have to replace it. (if the idle valve is removed, the shutter inside should easily move when you rotate it from side to side and you can also look at it with a flashlight for a visual inspection.

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At first the truck idles extremely rough when cold cranked. This went on for a couple of days, now the truck will not start at all. It hits every once in a while while repeated cranking on cold start. ...


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if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change it!

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Computer reads multiple misfires rough idle trouble starting


The air fuel mixture sensor is probably starting to fail. You need to have a simple diagnosis done at the shop and then have it replaced - they are usually not much a reputable mechanical shops. When the motor warms up your air/fuel mixture changes hence the rough idle etc. Hope this helps.

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