Common Engine Problems

H3 Leaking Valve Seats

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The H3's 3.7L engine has an issue with worn, leaky valve seats that cause the engine to misfire. Usually the only way to stop the problem is to replace the cylinder head.

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Where Engine Complaints Happen

Sometimes it helps just to tally up the complaints and see where the biggest stacks are. Use this information to learn about troublespots or to run for the hills.

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    DeMuro of Jalopnik.com bought a Hummer, and while it's "a ton of fun to drive" he also says it "the most unreliable piece of crap I've ever owned."

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