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What are the different symptoms between a cracked exhaust manifold vs blown head gasket and a very reliable mechanic said the car backfires and blows smoke and that it is an E. M. but is this accurate?
Thurman91
A cracked exhaust manifold should not cause a backfire, unless your engine is running extremely rich. It would, however, cause the engine to sound very loud and smoke to come out from the engine compartment. If your car is newer than 1996, than a cracked exhaust manifold would turn the Check Engine light on. A blown head gasket would cause coolant to leak into your cylinder head, which would cause large amounts of white smoke to come out of the tail pipe. If the leak is severe enough, then there would be noticeable puddles of antifreeze on the ground where the car was last parked. Even with a mild leak, the expansion tank under the hood would empty periodically and require topping off. If this was never done, then you would notice you car overheating (but the gauge may still read cold because it can only read the temperature of a liquid).
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∙ 15y ago
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