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GMC Jimmy Engine and Performance Problems

12 messages,  Last post on Aug 09, 2009 at 2:48 PM

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What is this discussion about? GMC Jimmy, Auto Repair, SUV

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#3 of 12 Jimmy won't shift by mmeuli Dec 10, 2007 (9:44 am)
My 2000 Jimmy has been hesitating when I accelerate. It has gotten worse. Now it won't shift out of 2nd. Computer says to replace about 6 different things including ERG Valve and Mass Flow Sensor. Now that I have done those 2 things it runs better, but still does not shift out of 2nd. Now the service engine light has gone out and the computer doesn't tell whats wrong anymore. Anyone got any suggestions. Replies to this message: peterock81 (Apr 07, 2009 6:46 am)
#5 of 12 '97 jimmy wiring harness by waltr97 Oct 20, 2007 (9:58 pm)
i have a '97 jimmy 4.3l w/ an auto tranny.... i had a shop do some custom work to the suspension and frame. the ac/heat, abs and cruise control were removed. from the time that i got it back it idled rough, when i accelerate it sounds like it's missing and it runs rich. shortly after getting it back the ses light came on. i got a scanner from autozone to read the code. the code i got was p0300(random misfire). i replaced the plugs, wires, distributer cap and rotor and still getting the same code. i'm by no means a mechanic, i just try to do as much as i can myself. so i take it in to the shop, hoping that they can tell me what is causing this misfire. well i'm told that the wiring coming from the computer is all hacked. before they can even try to diagnos the problem any further i would have to get it rewired. which is something that they do not do. they also told me that most likely that was causing my engine problem. a friend told me to get a new harness and he would help me replace it. now, after this long book that i just wrote, my question is... do i have to get a wiring harness from a '97 jimmy/blazer only? i'm pretty sure that it has to be from a 4.3l w/ an auto tranny. but could it be from a '95-up s10/sonoma or blazer/jimmy? any help would be greatfull.
#6 of 12 85 blazer 2.8 popping through carb by cumminsho Dec 22, 2007 (10:47 am)
I just bought this 85 s10 blazer cheap, and it pops through the carb. It will not go when you push the throttle. It idles alright, just will not go. A tune up was done and the timing chain was replaced by previous owner. My question is has anyone had camshaft problems with these? Also has anybody used the edelbrock camshaft with any success? Was anything else needed when putting the edelbrock in? It's not worth putting a ton of money into it. I just got it for a cheap winter beater. Thanks for the info.
#8 of 12 LOSS OF POWER by denis83 Apr 14, 2008 (7:10 pm)
I HAVE A 83 S-15 JIMMY2.8L W/CALIF EMISSION.ANY KIND OF INLINE OR LOAD AND IT CUTS OUT PUKES AND PUTTERS. IT WILL ONLY GO ABOUT 10 MPH. I HAVE REPLACE THE TPS ANDO2 SENSOR AND HAS NO MORE CODES. IT IS TIMED GOOD NOW AT A LOSS.
#9 of 12 help by jensjimmy Apr 15, 2008 (8:45 am)
hey,   so I have a 1996 gmc jimmy 4x4. my boyfriend just finished taking the engine out and replacing the rear seal. when he put it all together it was starting to have issues starting. I would have to start it 4 times for it to finnally go. so besides that it was working great. now I was driving home from work yesterday and it was stalling like every 2 blocks. and when my boyfriend started it after I got home it was making this crazy knocking sound. he thinks it might be the airflow sensor. I think the starting it was the vacume lines mixed up but I don't know why it's stalling now anybody have any advice for me?
#10 of 12 Re: Jimmy won't shift [mmeuli] by peterock81 Apr 07, 2009 (6:46 am)
Replying to: mmeuli (Dec 10, 2007 9:44 am) I had this problem with my jimmy and found it was the throttle position sensor. i as well had multiple codes including codes saying low input and high input to my map sensor. The truck shifted extremely hard going from 1st to 2nd and 2nd to D. I went to the junk yard and pulled one off a wrecked blazer for my truck 6.50 vs 45 or 50 bucks as a trial and error with the sensors. I tried the TPS first because from what reseach i did online it seemed to be the most common solution for the series of codes being tripped
#11 of 12 1996 GMC Jimmy won't stay running HELP by cproulx May 05, 2009 (3:48 am)
I just changed the fuel filter on my Jimmy - it ran fine for 2-3 days. Now it will start and run in park but when I put it into gear and give it gas it sputters hesitates and stalls out. Anyone have any ideas?
#12 of 12 99 JIMMY SLE WARM ENGINE HARD STARTING by puzzledjimmy Aug 09, 2009 (2:48 pm)
I HAVE A 99 JIMMY SLE. IT STARTS UP NORMALLY FIRST THING BUT WHEN IT GETS WARM AND I STOP TO DO SOMETHING FOR ABOUT 15 - 20 MINUTE, IT TAKES A FEW SECONDS TO TURN OVER. I MAY HAVE TO GIVE IT A LITTLE GAS TO TURN IT OVER. IT RUNS GREAT OTHERWISE. I HAVE REPLACED THE GAS TANK,GAS PUMP AND SENDING UNIT. THE FUEL FILTER. THE MAP SENSOR AND AIR FILTER. I HAVE HAD THE SPIDER INJECTORS CHECKED AND THEY ARE FINE. I GET BETWEEN 16 AND 18 MILES TO A GALLON. TOP PERFORMANCE FOR THIS VEHICLE I WAS TOLD. CAN ANYONE TELL ME WHAT MAY BE WRONG?

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