plugs full of gunk front ones the ones at the rear is ok

Asked by GuruPQSH5 Jan 23, 2020 at 11:12 AM about the 2003 Pontiac Grand Am GT

Question type: Maintenance & Repair

4 Answers


a compression test can check head gaskets, or better yet, a leakdown test can check valve stem seals & piston rings. Do you have any other gunked up areas, like the PCV or breather? If oil is migrating into the combustion chamber you may see some improvement with a different oil type/weight (like high mileage oil) or oil additives. Ultimately the only way to know for sure what is leaking (rings, stems) is to pull apart motor, in the meantime try a different oil weight and additives.

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what would cause gunk to be in the valves when i took the valve covers off


Most likely most of it is emulsified oil. A dirty or clogged PCV or breather cap (on older cars) can cause emulsified oil to build up. The combustion process can also cause a buildup of carbon in engine. Lack of maintenance over years adds up.

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i got motor striped down head gasket is gone

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