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A pressure test on the cylinders will tell if you have a bad head gasket. If you hear a whistle sound near the intake gasket, spray WD-40 (or any type of petroleum spray) on the area and if there is a leak the engine rpms (or engine sound) should change.

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โˆ™ 2006-10-14 13:19:22
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Q: How can you tell the difference between a bad head gasket and a bad upper intake gasket?
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