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GMC Jimmy Misfiring, Backfiring, Spark Plugs

65 messages,  Last post on Feb 09, 2009 at 10:25 AM

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#26 of 65 2000 Jimmy wont accelerate by brammermj Jul 11, 2007 (10:29 am)
#27 of 65 2000 Jimmy wont accelerate by brammermj Jul 11, 2007 (10:29 am)
Have a 2000 Jimmy, 114,000 miles. When taking off after starting vehicle, get tach around 2grand and while pushing accelerator the vehicle wont accelerate. Can push to the floor but nothing, tach will stay steady. Does not miss, bog down, nothing else unusual. After a couple of seconds it will take off. Is now at GM shop but they 2 hours in it and cant find anything. No codes, fuel pressure good, checked cap and rotor, nothing wrong can be found. He did say that in park and while pushing accelerator it doesnt seem like it picks up the RPMs like it should.
#28 of 65 Jimmy Misfiring by lynderae Jul 13, 2007 (2:53 pm)
#29 of 65 Jimmy Misfiring by lynderae Mar 01, 2007 (9:45 am)
First off let me say thank you for youre help with camshaft position sensor in distributor. I have also replaced the coil, the truck ran like a champ yesterday. Today however, I didnt get out of the driveway and it started misfiring. It is rainy today, but it was wet out yesterday. I cant figure this out, any help would be appreciated. Replies to this message: repairdog (Mar 03, 2007 5:54 pm)
#30 of 65 Re: Jimmy Misfiring [lynderae] by repairdog Mar 03, 2007 (5:54 pm)
Replying to: lynderae (Mar 01, 2007 9:45 am) Did you change the cap/rotor to rule them out? Crank sensor is under the front of the motor and they can act up without a code or the connector can get wet/dirty. Any SES light and codes?
#31 of 65 2001 gmc jimmy lifter noise by unicorn747 Apr 12, 2007 (7:59 am)
after replacing the thermostat because of it overheating now there's a noisy lifter- could this be caused from the engine getting too hot? it also due for an oil change. Replies to this message: repairdog (Apr 12, 2007 1:21 pm) unicorn747 (Apr 12, 2007 8:21 pm) repairdog (Apr 13, 2007 3:14 am) and 1 more...
#32 of 65 Re: 2001 gmc jimmy lifter noise [unicorn747] by repairdog Apr 12, 2007 (1:21 pm)
Replying to: unicorn747 (Apr 12, 2007 7:59 am) Oil and filter and hope the lower intake gasket isn't leaking into the valley. Keep a close watch on the reservior - fill it to the hot line when cold and look at each day and make sure its not dropping. No leaks either so look around. Replace the radiator cap with a new one now also. Hope you flushed the system out with that new thermostat and refilled with 50/50 Dex cool mix. Replies to this message: unicorn747 (Apr 12, 2007 8:21 pm) repairdog (Apr 13, 2007 3:14 am) unicorn747 (Apr 13, 2007 6:46 am)
#33 of 65 Re: 2001 gmc jimmy lifter noise [repairdog] by unicorn747 Apr 12, 2007 (8:21 pm)
Replying to: repairdog (Apr 12, 2007 1:21 pm) WELL WE CHANGED THE OIL AND THE FILTER- BUT THE LIFTER NOISE IS STILL THERE! WHAT DO I CHECK FOR NEXT? Replies to this message: repairdog (Apr 13, 2007 3:14 am) unicorn747 (Apr 13, 2007 6:46 am)
#34 of 65 Re: 2001 gmc jimmy lifter noise [unicorn747] by repairdog Apr 13, 2007 (3:14 am)
Replying to: unicorn747 (Apr 12, 2007 8:21 pm) Look for water dropping - #1 cause on 4.3 is the lower intake sprays a fine mist into the valley and the lifters make noise. You will normally NOT see any water in the oil when this occurs only the res dropping and morning lifter noise. Then if thats stable you got the engine so hot that you cooked some oil on or in a lifer or two so go buy some lifter cleaner that gets added to the oil and follow the instructions. Often takes 100 plus miles to quiet down, assuming no water getting in. Replies to this message: unicorn747 (Apr 13, 2007 6:46 am)
#35 of 65 Re: 2001 gmc jimmy lifter noise [repairdog] by unicorn747 Apr 13, 2007 (6:46 am)
Replying to: repairdog (Apr 13, 2007 3:14 am) GOOD NEWS IS THERE ISN'T ANY WATER GETTING IN!YOU WERE RIGHT ABOUT IT BEING BETTER ONCE THE ENGINE GET WARMED UP! I'LL PUT SOME OF THAT LIFTER CLEANER IN IT TODAY & I'LL LET YOU KNOW IN A COUPLE OF DAYS OR SO THE RESULTS! I'M PRETTY CONFIDENT THAT THE RESULT'S WILL BE "GREAT"! WHEN SHOULD THE OIL BE CHANGED AGAIN (3,000 MILES)? THANKS FOR ALL OF YOUR HELPFUL INFORMATION!!

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