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SUVs GMC Jimmy GMC Jimmy Starting and Stalling Problems
231 messages, Last post on Nov 13, 2009 at 1:49 PM
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Replying to: kenneyg (Jun 30, 2009 2:29 pm) One thing I replaced once was the temp. sender to the COMPUTER.... NOT the sender to the temp. gauge/light. It was inexpensive ($10-$12?  Autozone). Once the truck was up to temperature..the Computer temp. sensor/sender was telling the computer to not let the truck re-start. That solved my problem when the truck would not restart after getting up to temp. |
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Hey johnyring, Just wanted to thank you for letting me know this. I have forwarded it back home and maybe that will solve the mistery. thanks again. kenneyg. |
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Ok, I got my 1994 Jimmy a few months ago and I don't know what the guy did to it, but here is the situation............ The truck would sputter, like it was outta gas, and would slowly die. So we replaced the fuel pump, but found the gas tank had a crack.....haven't fixed that just yet. The new fuel pump and lines didn't help the issue, seemed to make it worse. Then we discovered that if you open the driver's side door when it starts to "die", and the domelight comes on, it kicks back-up and runs fine. Obviously I can't ride around with the door hanging open.........ANY suggestions would be GREATLY APPRECIATED Thanks Everyone!!
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Replying to: kellybell28 (Jul 14, 2009 12:45 pm) We had to replace the central port fuel injectors. Twice. Once last month, and once about 5 years ago. It runs good now, we shall see! |
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Replying to: nickjax (Jun 26, 2009 10:00 am)
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Replying to: steelerfan67 (Jul 29, 2009 8:50 pm) Two things I can think of at little to no extra costs... 1)Replace Temp. sensor/sender to the computer...NOT the sender to the guage. Inexpensive part to replace. Shop around...NAPA, Advance, etc., for best price. 2)Idle Control Valve (ICV). Clean it...may be sticking or STUCK in the "cold" position?? I hate throwing parts at a car hoping to solve the problem. Hope I helped? jonny |
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My jimmy bogs down if i step on the gas and when i let up it smooths out. I had the fuel pump replaced feb 09 and that now has a high pitched whine. Does anybody know what could be wrong? Are both problems related?
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Replying to: rockclimber2 (Aug 01, 2009 1:42 pm) A??: I'm no fuel injection expert, but when you step on the gas pedal, you are actually opening the throttle plate (the butterfly valve directly attached to your gas pedal via a cable)....which let's in a large amount of air (oxygen). So when you "step on it" and it "bogs"...it appears that it is not getting the increased fuel necessary to mix with the increased air you are letting in? So why is it not getting the increased fuel needed? First check your fuel pressure at the fuel rail (I covered that with photos in an earlier post). If the fuel pressure is good (60lbs?? I forget..look at the photo) then it sounds like an electronic problem. Attached to the side of the throttle body (right next to the butterfly throttle plate) is a little electronic box called the Throttle Position Sensor (TPS). It has some wires that run from it....into the engine wiring harness and ultimately to the Engine's computer/brain/Electronic Control Unit (ECU). This friggin' TPS thingy is supposed to tell the computer the position of the throttle plate and regulate (tell the computer/brain/ECU) the added fuel needed for the increased air added? This TPS might be the problem? It may be bad? ( Lightly rap/tap on the TPS with the handle of a screwdriver to see if it "jars" it back into working order?) Or, the TPS may be good and the area in computer/brain/ ECU linked to the TPS bad? (That would require a NEW or Used "Junkyard" ECU). I'm sure the TPS is less expensive than the ECU. As I stated, I'm no expert, but do know a little bit and this makes sense to me. Or I may be the blind leading the blind? Let me/us know how you make out jon 8-) God I strongly dislike Fuel Injection when it malfunctions and you need to have equipment to pull codes and what not! Nothin' better than a good ol' simple carburetor , IMO.
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Replying to: jonnyring (Aug 01, 2009 9:49 pm)
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Replying to: rockclimber2 (Aug 02, 2009 4:01 am) Oh, I didn't know it was an intermittent problem...I thought it was permanent and wouldn't drive...just idle. This "high pitch" sound...is this all the time or just when it "bogs"? Sure, change the filter..can't hurt. Still it could be "intermittent" as far as the TPS/ECU are concerned. Change filter and see if it cure's it. Filter should be located inside frame rail, drivers side, forward of tank= simple and quick change. If that doesn't do it...check fuel pressure= that'll determine the pumps' status. If all that is good.. look into TPS "tapping on it" and/or replacing it. _____________________________________________________________ "another problem is starting after driving it and shutting it off after about 15 minutes it starts hard it turns over about 7 times and starts but, in the morning after sitting it starts right up. whats your thoughts on this ?" Fuel system VAPOR LOCK. I don't know how to fix this yet..google it. I have the identical problem on an '86 BMW 535i Dirt Ralleye car. When I beat on it hard....it doesn't wanna start until it cools down. Haven't researched it yet. jon
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