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1995 GMC Jimmy Questions & Answers
1995 gm tuck 7.4L o2 sensor contantly reads over
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.
1995 GMC Jimmy brake lights not working
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!
How to start my 95 gmc jimmy without a key for it.
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.
1995 GMC Jimmy will not start.
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.
Has hot air coming from under dash with nothing on
Harold, one of the vent door actuators is probably stuck holding heater doors open, or the duct work may have come apart under dash.
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