20 Most Recent 1995 GMC Jimmy Questions & Answers

Get this manual online at www.reliable-store.com and get complete guide on whether to repair or not, service it, and how to repair etc, along with wiring diagrams, electrical diagrams, torque specs, error codes, everything.

Use a gage and check proper fuel pressure. My info for the 7.4L engine says, 26--32 psi, so if it is right in the middle somewhere, should be ok. If pressure too high, check out the return side of the fuel system. If you have a leaking fuel injector, fix it.

Change your motor fan and change your temperature sensor.

Some of the older GMC ECM's keep the error code for some time. You may have to have it reset and see if the code comes back. I had a Yukon that had a check engine lite on for about 6 months and it finally went off last week!

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If something is draining the battery you have a parasitic draw on the electrical system . There are a couple ways of testing for this . GM insturment clusters can cause this problem as well as a module not powering down . Really don't think electrical wire burnt problem . The car would catch fire an burn up. The BEST Way TO Perform Parasitic Draw Test How To Perform Parasitic Draw Test EricTheCarGuy The Trainer 27 3 Ways Of Finding The Cause Of Key Off Battery Drain...

bad switch?

Mine does the same thing, Have not found a fix.

Replacing internal parts on that old a transmission is a waste of money. I would replace it with a certified rrebuilt.

Brake lights run through the hazzard switch. There are known problems with this, and the multifunction switch. You may need to buy a new hazzard switch and OR the multifunction switch. Before you do that, check the pigtail that goes into the brake switch up by the fender, make sure it's not shorting out up there. Happened to me!

Replace the ignition lock cylinder with a new one that you do have a key for or go to the dealer prove to them that you do own the car and they will contact GM and make a new key to fit your vehicle.

Nope.

I am old school and do not know if vacum modulator still used , check if hose still ok . Modulators used to be cheap . Hugh

It sounds like you have a fuel problem (too lean). This problem is probably with the injector spider assembly, a common problem with high mileage Jimmys. Early versions of this spider do not use individually controlled poppets - just one injector that feeds each of the six cylinders in sequence under control of the ECM. If you can get it started, try a high strength injector cleaner in the gas tank. Also, the fuel pressure reading must be within normal range when you turn ignition on and then while trying to start the engine, and if not, the fuel regulator is faulty. You could also have a malfunctioning injector. In either case, you should try replacing the entire spider assembly. Replacing the faulty O2 sensor is also a good idea. This engine starts in open loop mode, and after it warms up it tries to go to closed loop and the ECM will attempt to use the O2 sensors in it's calculation for fuel delivery. If one or more of the sensors are contaminated, this will drive the ECM crazy.

There is no timing sensor - what you are looking for is the crank sensor located on the timing chain cover (front of engine).

Check fuses and relays.