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Q: shuts off after driving

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When I drive my Hummer H2 over 17 miles it shuts off after I get off of the freeway. When the rpms drop down to idle it shuts off. I brought my car to the dealer, and they are telling me I might need a new engine. The engine has no noise or any smoke coming from it. The dealer is clueless. Can you shed some light on my car issues?

A: If I was diagnosing your Hummer, I would wa...

If I was diagnosing your Hummer, I would want to know if there were any diagnostic trouble codes (DTCs) stored in any of the computer modules. I would see if the Check Engine light was on and use my scan tool to find out. I would then do a thorough visual inspection under the hood. I would test the battery and check cables for clean and tight connections. Then I would drive the H2 and attempt to get it to stall on me and see if it would restart. From there, I could feel whether it seemed like a fuel-related problem or a spark-related problem.

I would then want to have a look at the operation of the camshaft position actuator and also know if your engine has enough oil pressure to allow that system to function correctly. A technician with a scan tool on a test drive can do this for you. Low oil pressure when hot could be the reason you were told to get a new engine. However, I would recommend having a trained professional, such as one from YourMechanic, inspect the vehicle’s stalling issue to determine what repairs are necessary.

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