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2010 Hummer H3 Questions

Get answers to questions about your 2010 Hummer H3 at RepairPal. Find solutions, diagnose problems and get back on the road.

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Like when you fitting another used engine from another used 3.7L engine, and the starter motor plugs are not the same. THe crank angle sensor the old one is a 2 pin and the new one is a 3pin.

I just purchased this vehicle. Can you share what could be causing it to only be averaging 6-7 mpg?