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2005 GMC Yukon 1500 truck runs like it has a few dead cylinders and won't do more than 40mph. When it gets to normal operating temperature it gets worse and quickly dies and doesn't want to crank again until engine has cooled off completely. Just put on new coils, wires, and plugs and the problem is still there please help!
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@bobby1030 Is the truck throwing any codes how many new coil packs did you install . How long did you run the truck when it was misfiring ? What it sounds like is that you may have plugged your cat . If you ran the truck for any length of time with raw unburnt fuel running into the catalytic convertor you run the risk of plugging it . If that happens it puts a lot of strain on the engine leading to misfires and no power causing overheating and stalling . If your getting an engine code of P0420 or P0430 . you may need to change the convertor. You can also test the convertor by measuring the temp on both ends of the convertor if the temp is the same or less after the convertor then its not working it should be considerably hotter after the convertor
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Last time you replaced fuel filter?
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Its been about a year. How would a fuel filter cause it to shut of when it reaches normal operating temperature and not start again until engine has cooled off?
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It sounds like the engine or transmission is in "limp in" mode. This is to protect the powertrain in case of an potentially damaging problem.
When the engine gets to operating temperature, the computer enters closed loop where the sensors tell the PCM how to control the operation of the engine.
Before operating temperature, the PCM runs on programmed tables.
"Limp In" mode has its own set of tables to control the engine.
You will need to check all the codes and determine the problem. Most likely an emissions issue.
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