Question about 1995 GMC Jimmy

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95 jimmy has rough idle and no communication from the computer to the data connector i have replaced the computer and no difference....

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as you already replaced the computer please check the data connectors. the wires in it might have damaged and the signals are intrepted. so please check

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Posted on Jul 11, 2010


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1 Answer

01licoln navigator missing

Check the fuses. Usually the data link connector is powered of an accessory fuse or the cigar fuse. If the fuse is blown than there will be no communication with the computer. Once the fuses are checked and any blown ones are replaced bring it back to have it scanned.

I agree that it sounds like a coil.

I’m happy to assist further over the phone at

Jul 25, 2012 | Cars & Trucks

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My 95 jimmy is running rough, shaky at idle. I had a guy hook up the scanner and my computer could not hook up. Could not find problem that way. Could it be a sensor?

Common for the EGR valve to get dirty with carbon and causing it to stick open. Start with the simple and clean your EGR valve and throttle body, if the EGR valve is to far gone to be cleaned. Your going to have to replace it,you can use Deep Dreep made by Seafome and would be a good idea also to give your Jimmy a Seafome treatment.
Use two cans and follow the instructions on the can and thins should bring life back to your engine.
Thank you for using fixya, and be safe.

Jul 09, 2010 | 1995 GMC Jimmy

1 Answer

95 gmc jimmy rough idle fuel in exhaust drives

Purchase new egr valve gasket with screen on it. The motor as it get older produces more carbon it then begins to break off and when the valve opens it get caught in there. i have cleaned mine several times and finally found the gasket at napa for around 22 bucks. All you need it 10mm wrech and 10mm socket with ext. takes around 10 min to do.

Jan 10, 2010 | 1993 GMC Jimmy

1 Answer

How do I get the trouble codes from a 1995 GMc Jimmy? I has the obdII connector but my code reader wont communicate.

some code readers have problems reading the 94 -95 vehicles wasnt till 96 that it was required to have the 16 pin obdll system -but check the connection and try again if it still tells u cant communicate take truck to an auto store for a scan some such as auto zone/ advanced auto do it for free and also have ur scanner checked could have a bad wire connector

Nov 14, 2009 | 1995 GMC Jimmy

2 Answers

1995 gmc jimmy 4x4 rough idle smell gas from tail pipe

To check EGR valve, plug the vacuum hose to it, and it should not get hot anymore. It if does, it is leaking.
But gas smell is usually bad plug wire or plug.
With good insulation, remove one sparkplug wire at a time, to see if one has no effect. That is the target.

Jul 25, 2009 | 1995 GMC Jimmy

1 Answer

My 95 jimmy sputters when taking off.

Plugs, wires, fuel filter, vacuum leaks

Jul 21, 2009 | 1995 GMC Jimmy

1 Answer

Engine running rough, hard starting

Try cleaning the EGR, there common to carbon build up on the 95 JImmy's.

Mar 20, 2009 | 1995 GMC Jimmy

1 Answer

1995 Jimmy Rough Idle

w/o much more info it sounds like it needs a good tune up plugs wires fuel filter pcv vave throttle bore clean and injecter clean,try to do most of this your self it is costly

Jan 16, 2009 | 1995 GMC Jimmy

3 Answers

OBD 1 and 2 will not communicate with PCM.

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Nov 12, 2008 | 1994 Pontiac Bonneville

1 Answer

My 95 cougar with 3.8 has rough idle

Your car has serious issues, far above a simple forum like this one. My guess is that your throttle body assembly is clogged with soot. It will have to be be removed and the TPS and Idle control valve removed. The Throttle Position Sensor could be your problem, if the spring is broken... this is uncommon but possible. The throttle body will have to be cleaned, soaked over night in gallon container of choke and throttle body cleaner. It is easy to remove, just be careful with the electrical connectors to the sensors. A simple 3/8 in racket set is all you will need. (Go to an Autozone and have them run a free diagnostic on your car's computer and they will give you a free print-out and tell you which parts are faulty, first thing.) A faulty Idle control valve with cause the rough idling, don't try to clean it... just get a new one, if it's sooted up.

Sep 02, 2017 | 1995 Mercury Cougar

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