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SUVs GMC Jimmy GMC Jimmy Misfiring, Backfiring, Spark Plugs
65 messages, Last post on Feb 09, 2009 at 10:25 AM
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My Jimmy drives fine around town. I've just replaced cap and rotor, spark plugs, O2 sensors, and catalytic converter. The problem is every time I try to drive up a steep incline the truck will lose power, then chug and sputter like it's gonna die. If I turn around and go back down the hill, the sputtering and chugging stops and she runs fine again! What is going on? Any suggestions?
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Replying to: daylyn (Apr 16, 2007 8:36 pm) Change the fuel filter and if then check the fuel pressure.
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Replying to: repairdog (Apr 17, 2007 1:32 am)
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Replying to: daylyn (Apr 17, 2007 6:57 am)
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Replying to: repairdog (Apr 17, 2007 7:15 am) How would I find out if the coil was failing? Just replace it? It seems that the truck only behaves this way on one hill, which is at a high altitude. If the MAF sensor was malfunctioning, would it cause the truck to behave this way in high altitudes? Any way of knowing if the MAF or MAP sensors are malfunctioning before spending money to replace? I did lightly clean the MAF last nite, and made it up the hill a little further before truck crapped out......
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Replying to: daylyn (Apr 18, 2007 7:25 am) Have to test the primary and secondary windings and some auto stores can test for you free. |
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Replying to: repairdog (Apr 18, 2007 9:05 am) We replaced every "suspect" part on the damn truck, as follows: Transmission (needed to be done, was slipping badly) Cap & Rotor Spark plugs & wires Distributor Catalytic converter O2 Sensors, MAF sensor, MAP sensor, cam position sensor, ignition control module sensor. Intake manifold gasket Fuel filter, fuel pump Oil filter, air filter Ignition coils Radiator And the problem was that the exhaust valves were burned. One exhaust valve had gotten sooo hot, that it was misshapen, and actually was thinning out. Eventually, the thing got so warped, that the piston came in contact with it, and I lost all compression in that cylinder. This is the only way we would have ever guessed that this was the issue. The valves cost $35.00 each. Lots of labour - 8 hours, but the end result was a fix of $1300. Which is less than 1/4 the amount of money we spent trying to fix the damn thing. We researched this issue for months and months. We never had anyone even guess that it might be exhaust valves. The only issue we had was high emmissions, and a random cylinder misfire code, which was intermittent (P0300). Hope this information helps someone else out. For additional info or input, feel free to send me an e-mail: daylynbc  hotmail.com
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Replying to: daylyn (Jun 29, 2007 12:04 pm) |
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Replying to: daylyn (Jun 29, 2007 12:04 pm)
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Replying to: mtrotter70 (Jul 01, 2007 5:49 am) Not until the valve actually warped and burned, did we find out that was the problem. The original problem was the valve getting too hot. |
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