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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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#36 of 65 service engine soon light by unicorn747 Apr 13, 2007 (7:23 am)
ONE MORE QUICK QUESTION- COULD THE SERVICE ENGINE LIGHT STAYING ON NOW BE CAUSED FROM THE STICKY LIFTER??? LAST TIME IT HAD COME ON WAS BECAUSE THE GAS CAP WASN'T ON CORRECTLY & I ALREADY TRIED THAT AGAIN. Replies to this message: repairdog (Apr 13, 2007 3:16 pm) unicorn747 (Apr 14, 2007 12:38 pm) repairdog (Apr 14, 2007 4:21 pm)
#37 of 65 Re: service engine soon light [unicorn747] by repairdog Apr 13, 2007 (3:16 pm)
Replying to: unicorn747 (Apr 13, 2007 7:23 am) Get the code read out at any Advance or AutoZone for free to know. Read the instructuions on the lifter bottle as some require a change sooner, some don't. I do all mine every 3000 and only use the Valoline MaxLife 10w-40 now as my 4 are all over 100k miles. Do not use the $2 oil filters either - I have used the mid grade Fram Toughguard ones for years or best is WIX or NAPA Gold - forget the ones with Teflon in them. Hope all works out noise free! Replies to this message: unicorn747 (Apr 14, 2007 12:38 pm) repairdog (Apr 14, 2007 4:21 pm)
#38 of 65 Re: service engine soon light [repairdog] by unicorn747 Apr 14, 2007 (12:38 pm)
Replying to: repairdog (Apr 13, 2007 3:16 pm) YOU SAID THAT 4 ALL WITH OVER 100K MILES- WHAT KIND OF VEHICLES ARE THEY?? ALSO THE BOOK THAT CAME WITH MY JIMMY SAY'S TO USE 5W-30 OIL IN IT. MY JIMMY ALSO HAS A LITTLE OVER 100K MILES NOW. AS FAR AS THE NOISE- WHEN I STARTED IT THIS A.M. (COLD) THERE WAS NO NOISE. I DIDN'T EVEN PUT THE LIFTER STUFF IN YET. I JUST DROVE IT YESTERDAY ABOUT 45 MILES AFTER THE ENGINE WARMED UP SO THE NOISE WAS GONE, BUT THE LIGHT WENT OUT FOR MOST OF THAT TIME & THEN IT CAME BACK ON. I'LL LET YOU KNOW WHAT HAPPENS THOUGH! THANKS AGAIN!! Replies to this message: repairdog (Apr 14, 2007 4:21 pm)
#39 of 65 Re: service engine soon light [unicorn747] by repairdog Apr 14, 2007 (4:21 pm)
Replying to: unicorn747 (Apr 14, 2007 12:38 pm) All Blazers and after 100k I switched to 10w-40 MaxLife as all the bearings and seals have worn and I'm in FL so always hot! Great if the lifters already are quiet - new oil must have flushed the sludge stuff off.
#42 of 65 Misfire Issue by vicedetective Jul 13, 2007 (11:16 am)
So here is the lay out. I have 1996' GMC Jimmy that has a misfire problem, its the #6 cylinder. I stared with the simple things. I changed my plugs and plug wires, changed my o2 sensors, changed my fuel filter and now just at a loss. I dont really have to much loss of power at the gas petal, sometimes a small delay when hitting the gas at a red light and also when starting I have to give the truck alot of gas. I started to worry maybe I have a blown head gasket but I dont have any real symptoms of it. My truck is not over heating, I have no white smoke out my tail pipe nothing. Thanks for any help that can be givin in advanced. Replies to this message: repairdog (Jul 13, 2007 2:53 pm)
#43 of 65 Re: Misfire Issue [vicedetective] by repairdog Jul 13, 2007 (2:53 pm)
Replying to: vicedetective (Jul 13, 2007 11:16 am) New cap and rotor to rule out and do not use cheapos like Wells. Misfires can also be caused by a bad or clogged injector, burned valve, or leaking head gasket as you said.
#44 of 65 98 Jimmy Dies by 98jimmy Jul 21, 2007 (10:07 am)
#45 of 65 98 jimmy dies by 98jimmy Jul 18, 2007 (8:00 am)
I have a 98 jimmy 4.3 liter 106,000 miles. The problem started 3 years ago when moving from Alaska to nevada. In hot weather only, driving fast or slow or idling, the engine will intermittently die after getting warmed up. No problem with restart--I am use to popping it into nuetral and restarting on the fly. The engine is smooth as pie before/after this happens. my gas mileage is normal. No error codes, no other symptoms--headlights fine, music keeps playing during these events. This might happen 3-4 times in a row ,once in a while or not at all when the GM mech is driving it. This is only a maybe but it seems like just pulling over , turn the ignition off/on maybe helps a little. I tried new ignition switch and fuel filter. local GM folks got nothin' I don't mind shotgunning the problem is I had a likely list of culprits. Help! Replies to this message: repairdog (Jul 18, 2007 2:11 pm) 98jimmy (Jul 19, 2007 8:02 am) repairdog (Jul 21, 2007 4:03 am) and 1 more...

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