GMC Jimmy problem


Asked by Jun 05, 2011 at 09:09 PM about the 1991 GMC Jimmy

Question type: Maintenance & Repair

I have a 1991 2WD 2 door GMC Jimmy with a vortec. it runs really rough at an idle and cant
figure out why. once you give it a little gas is smooths right out. i did a full tune up, replaced all
the vacuum lines, changes a bunch of sensors, and it still is doing the same thing. everything on
it is now new, but yet it still runs like crap and chokes itself out at an idle unless like i said you
give it a little gas then it smooths right out and runs like a champ. any ideas?

2 Answers


look for a vacume leak. buy a can of carb cleaner and start sprating vacume lines and then the intake where it bolts to the head on both sides. if you hear a stumble theres your leak. also when you do a tune up you should always do a compression check. how did the plugs look? were they all burning equal, hot, or fouled

1 out of 1 people think this is helpful.

yeah we did that there were no leaks in the vacuum lines when we did the tune up. the spark plugs werent even all the way in i think my boyfriend said it was only running off of 2 or 3. he used to be a mechanic so he could tell you way more than i could. we replaced some sensors, the computer, and the distributor and none of that seemed to help it a ton. it did help a little and after we replaced those it quit throwin 4 codes and is not only throwin 1 which is code 42. when we replaced the distributor we found a part that was put in upside down from the previous owners lack of knowledge of mechanics. we started to recheck things today and there seemed to be a leak coming from the egr valve so we took it off and it was actually plugged so bad that i didnt even know the square hole was square until i touched it and crap just crumbled off then my boyfriend started scraping and cleaning it out. so now he has that all cleaned out, he said it seems to be running a lot better, we dont have to wood it to the moon to get the damn thing started and it is actually staying running so far. but when i get more information i will post again and let you know what Gods Mechanical Curse is doing. thank you for your help!!! :)

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Rear seat/belts in99 GMC Jimmy 3 answers

    My husband recently purchased a used 99 GMC Jimmy. We have 3 children, however the rear seat only has 2 seat belts. How do we go about either changing out the seat or adding a 3rd seatbelt

    1999 GMC Jimmy 2 Dr SL SUV


    Maintenance & Repair

  • 1999 jimmy hard start 4 answers

    I have a 99 gmc jimmy that is hard to start I turn the key and give it a little gas and starts up every time. My coolent temp sensor is broken could that be the problem

    1999 GMC Jimmy


    Maintenance & Repair

  • 1998 gmc jimmy 8 answers

    why does my jimmy start and shut off after about 3 seconds?Had jimmy running fine but the starter give out i put another one on but wouldnt start.accendently took out security bypass for the remote ...

    1998 GMC Jimmy 4 Dr SLT 4WD SUV


    Maintenance & Repair

  • my gmc jimmy has been nothing but a problem since it hit 34,000 miles....anyone else have problems with theirs? 4 answers

    - the gas line broke - a hole rotted through the gas tank as well (vehicle was 4 years old) - when the wheels were taken off for a brake change, the backer plates - crumbled and fell off ( vehicle...

    GMC Jimmy


    Maintenance & Repair

  • my jimmy starts once in a while 2 answers

    Tried to star the jimmy and no can do, plugged the jimmy in and started right away. the jimmy plugged in again started after several tries. hooked up a test and no codes show up. The jimmy plugged in ...

    2001 GMC Jimmy



Search GMC Jimmy Questions

GMC Jimmy Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 280
#2 tennisshoes
Reputation 240
#3 1oldman
Reputation 220
View All

Related Models For Sale

Used Chevrolet Blazer
1,152 listings starting at $700
Used GMC Sierra 1500
802 Great Deals out of 67,044 listings starting at $1,499
Used GMC Yukon
370 Great Deals out of 17,282 listings starting at $2,500
Used Ford Bronco
166 listings
Used Chevrolet S-10
11 Great Deals out of 1,360 listings starting at $1,595
Used GMC Sonoma
8 Great Deals out of 483 listings starting at $1,995
Used GMC Suburban
132 listings starting at $3,500
Used Ford Explorer
832 Great Deals out of 75,017 listings starting at $1,200
Used Jeep Wrangler
288 Great Deals out of 18,693 listings starting at $2,995
Used Ford F-150
2,264 Great Deals out of 209,447 listings starting at $1,499

Used Cars For Sale

2001 GMC Jimmy For Sale
54 listings starting at $2,495