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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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#1 of 65 93 Carbon Problem and Then Plug Problem by daytripper540 Mar 26, 2007 (3:04 pm)
Our 1993 GMC Jimmy started building up carbon in the EGR Valve. We Seafoamed it, but that didn't seem to help. We later put a new gasket on the EGR that has a screen on it. That has seemed to fix the carbon problem.   As of right now, it keeps fouling spark plugs. It sounds like it has a huge cam in it, which I'm taking as it not running on all its cylinders. When I take the plugs out, they seem to have gas on them. Any idea on what's causing it and how to fix it? Replies to this message: repairdog (Mar 28, 2007 1:58 am)
#2 of 65 04 Chevy Blazer by frschevy Mar 27, 2007 (12:50 pm)
I have a 04 chevy blazer 6 cyl 4 wheel drive. I purchased in Jan 07. (39,000 miles) Its been back to the dealer 4 times for stalling. I'm just driving down the road and its shuts off. I still have power but the engine quits. so for all that has been done is (replaced) the distributer cap and roater,the coil and something attached to it. They can't figure it out. I don't get any check engine lites. Im pritty sure the problem is electrical,but who knows. Can anyone help this is driving me crazy.
#3 of 65 Re: 93 Carbon Problem and Then Plug Problem [daytripper540] by repairdog Mar 28, 2007 (1:58 am)
Replying to: daytripper540 (Mar 26, 2007 3:04 pm) Running too rich so look at the CPI and nut kit (injection and hoses) under the upper intake. Posts on that and how to look at can be found by a search in the forum. Do you smell gas also? Hows the oil consumption - if high look at clogged PCV or worn valve seals - never stated the mileage. Then air filter should be clean also and vent to other valve cover attached and good.
#4 of 65 Re:Re: 93 Carbon Problem and Then Plug Problem by daytripper540 Mar 28, 2007 (8:50 pm)
It has 175,000 miles on it. And yes, I do smell gas when I run it. I replaced all the spark plugs and it still seems like it is misfiring. Thanks for the information. I will look into it.
#5 of 65 tricky sparkplug change by quickfox Apr 09, 2007 (9:50 am)
#6 of 65 tricky sparkplug change by quickfox Apr 08, 2007 (5:21 pm)
How to change middle sparkplug on driver"s side of 1996 Jimmy with 4.3 V6- problem is steering shaft blocking acess Replies to this message: repairdog (Apr 09, 2007 3:04 am) jlflemmons (Apr 09, 2007 9:50 am) nljewell (Dec 04, 2008 9:55 am)
#7 of 65 Re: tricky sparkplug change [quickfox] by repairdog Apr 09, 2007 (3:04 am)
Replying to: quickfox (Apr 08, 2007 5:21 pm) 2 ways used and 1 is short plug socket and open end wrench thru the wheel well or 2 is unbolt the steereing shaft at the flex and move the shaft - change plug and reinstall shaft.
#8 of 65 Re: tricky sparkplug change [quickfox] by jlflemmons Apr 09, 2007 (9:50 am)
Replying to: quickfox (Apr 08, 2007 5:21 pm) You can also use a 3/8 socket, an adapter from 3/8 down to 1/4, use a 1/4 extension, and come in through the wheel well. Using the adapters and thinner extention gives enough play to get around the shaft. Just barely, but enough.
#9 of 65 1998 GMC Jimmy stalling , losing power , backfiring through carburetor . by nevrbyajimmy May 06, 2007 (11:27 am)
#10 of 65 1998 GMC Jimmy stalling , losing power , backfiring through carberator . by nevrbyajimmy May 01, 2007 (11:11 am)
This 4.3 liter starts up easily like nothing is wrong , start heading down the road and after about 10 minutes of driving the engine loses power, { the more you push the gas pedal the slower you'll go } untill it then stalls , while still coasting I can put it in neutral , and restart the engine like nothing happened and go down the road , { engine runs fine } Then after a few miles it starts acting up again . And when it is acting up if you floor it it will backfire under the hood { carberator ? } Replies to this message: nevrbyajimmy (May 01, 2007 11:18 am) repairdog (May 02, 2007 11:25 am) nevrbyajimmy (May 05, 2007 11:40 am) repairdog (May 06, 2007 3:04 am)

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