Question about 1992 GMC Jimmy

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1992 Jimmy is lacking in Power.

So My Jimmy is running with a serious lack of power. It accelerates well, but under heavy load - and especially up hills - it just seems that the motor is revving higher and eating a lot more gas than it should for how little power there seems to be at the wheels.

My timing, Plug/Wires/ect./oil and fluids/filters are all good. I recently ran fuel system cleaner to clean the TBI injectors and such. The motor (4.3l TBI V-6) doesn't leak or smoke or make any weird noises aside from it's being 240,000 miles old and a little grumpy in the morning.

Any suggestions on where to go next? I have heard it could be my torque converter going out, but I don't know for sure how to check that without pulling my transmission, something I don't want to to, obviously, unless I am sure I'm going to replace it. I have also heard that it could be a compression issue, but there is nothing in my oil when I change it and it doesn't smoke or anything to make me think that anything is getting past the head-gasket. Could it just be that the motor is old and needs rebuilding?

Any help would be appreciated. Thanks!

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  • jrmy_mlls Apr 22, 2010

    Thanks. I am going to do a compression test this sunday. I'm not super knowledgeable about transmissions, especially automatic ones. They have a clutch as well that could be going out? I know how to pull and replace a tranny, but I'm not super sure about how they are configured.



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The first thing I would do is check the compression. a gauge is $30 or do the loan a tool thing from autozone. all you do is pull each spark plug and put the gauge in and then have someone crank the motor. Disconnect the coil so it doesnt try to start. If all is good there then I would check into a clutch. If it is worn it could be slipping this does require pulling the transmision.

Posted on Apr 22, 2010

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You should have also posted your engine code. I'm going to hazard a guess at you having a W engine code. All it means is that you have the 1st gen of the Spider Injector. The little plastic tubes, over time, will develop cracks and leak out. I had a similar problem that slowly over time escalated me only being able to go 20 mph on an even surface, to not even wanting to start and stalling out unless it was given constant gas. When I pulled off my upper plennum and looked I could physically see the cracks. I had a friend turn the key into the on position while I was starting at the injector and fuel sprayed everywhere.

Posted on Jul 16, 2010


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