Question about 2005 Cadillac STS

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Engine problem Randome misfire, misfire on number 7 cylinder. I beleave I am loosing coolant but there is no external leak.I have changed spark plugs, number 1 coil bank. engine runs ruff when first started like it is getting to much fuel.it will run this way until I drive for about 15 miles then I will pull off the road turn the engine off and set for aprox. 20 to 30 min. and thin start the car and it will run wright some times. if I give it to much gas it will run ruff again. there is a strong oder coming from the exhaust. I have changed the spark plugs and the number one coil bank

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Probably a head gasket problem,once again. It's burning the coolant off the plug . To make sure ,use a "block tester" from NAPA ,it is a liquid that changes color with the presence of exhaust gas in the coolant.

Posted on Apr 14, 2014

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