Best Answer

Mid 90's Jimmy's have issues with cracked blocks, at transmissions, the front differencial, as well as the oil: pan, filter, pump, and gasket. It is very possible that the block is cracked.

AnswerIt could also be carbon in the EGR valve... AnswerEarly 90's Jimmys has a multiport fuel injection system which used a fuel regulator and delivery system inside the intake maniford. The Central Port Injector(CPI or Spider) has had a tendency to leak from the regulator putting excess fuel into one side of the intake manifold. The single O2 sensor reading the combined exhaust trys to lean the mixture by shortening up the "on" time for all of the injectors which leans out the other bank of cylinders. In essence you have three cylinders running rich, three running lean. Not the best situation for a stable idle.The indication of this is that one side of the intake manifold will be relatively clean(usually a yellowish brown)from being cleaned by the gasolene, and the other side dirty from the blow-by products from the crankcase vent. Check out: a expert diagnosis from an ASE Certified Tech with lots of pictures of what I was trying to explain. Look for "Jimmy CPI Unit" on EBay, they have some of the newer modified units for fairly cheap ($200), their not hard to change, just be careful not to get any dirt into the injectors when you remove the poppet valves at the end of each feed tube. That's about it if it's the CPI, hope it helps.94 AnswerI have gone through 2 EGR ValvesA few times a friend even cleaned one to get it going, It worked for a while but eventually failed. Answerits prolly the egr valve a piece of carbon is prolly holdin it open mine used to do that but i got a gasket made by timeco an it has a screen that stops the carbon from buildin up AnswerIf the check engine light is on, get an obd2 scanner and check out what code is stored in the computer. The scanner will tell you what codes showed up even if the light is now off. The code should tell you exactly what is wrong without guessing.
User Avatar

Wiki User

โˆ™ 2011-09-13 17:52:07
This answer is:
User Avatar
Study guides

Add your answer:

Earn +20 pts
Q: What would cause a 1995 GMC Jimmy to idle and run rough and the check engine light come on?
Write your answer...
Still have questions?
magnify glass
Related questions

Is the check engine oil light the same as the check engine light?

No, oil level does not cause the check engine light.

Can unplugged mas cause check engine light?

Yes, an unplugged sensor can cause a check engine light.

Can water in the gas tank cause check engine light to flash?

Yes, water can cause a misfire, which will cause the check engine light to flash.

What causes the check engine light to go on a 2001 GMC Jimmy?

Check your gas cap.....My check Engine light always comes on if it is loose or not on at all.

Is car safe to drive with check engine light on?

It really depends on what the cause of the check engine light is.

Can low gas cause a check engine LIGHT?

No, low gas cannot cause a Check Engine light to turn on. There would have to be a problem within the engine or the engine wiring for that light to come on.

How do you reset the check engine light on a 2008 Chrysler Sebring?

The check engine light is reset with a scan tool after repairing the cause of the fault.The check engine light is reset with a scan tool after repairing the cause of the fault.

Will a burnt out head lite cause check engine lite to come on?

no a burnt out headlight will not cause a check engine light but if you go to most of the part places they will check the check engine light for free

Can service light cause uneven idling?

No, but something that could cause uneven idle could cause the check engine light to turn on.No, but something that could cause uneven idle could cause the check engine light to turn on.

Does a burned out tail light cause check engine light to stay on?


Will low coolant cause check engine light to light?


How to pass inspection with a check engine light on in a 2001 dodge neon?

You will need to get the cause of the check engine light repaired.

People also asked