Question about 2009 Hummer H2

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My 2009 H2 is idling rough for 2-5 min with a cool start, after 2 weeks of doing this, its now blowing white smoke on the first start of the day for 2-5 mins, after that it runs normally, I have NO Engine error codes , No visible oil leaks... This started more or less a few days after the cars 5000km oil change. Engines hrs is around 230. correct oil was used.

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My guess would be a leaking intake or head gasket. Water in the cylinder(s) is shorting the spark plug until the temp comes up on the engine. The white smoke is the coolant being burnt off. check your coolant level it may be low.

Posted on Nov 07, 2010

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