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Cranks but slow to start
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Question
alvocado
2011 GMC Yukon 5.3l, 194k miles. Recently started exhibiting long crank time and slow to start. The engine is cranking indicating the starter is working and the battery is charged. If I back off the key then try again, the engine starts and runs fine. I did notice that the starter continued to crank without rotating the key past ON and I had to return the key to off for it to stop.
it’s either air, fuel or spark. I don’t have a fuel guage to check pressure at the rail but will pick one up if that’s an appropriate troubleshooting step. Does this sound like a fuel pump that is going out based on the mileage? I’m not aware of a fuel filter on this gen Yukon.
Any advice on troubleshooting sequence would be appreciated.
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