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20/02/2023 3:41 pm
Topic starter
1986 Chevy S10, 210k miles, 4x4 automatic
6 cylinder
Hey everyone, aloha, wondering if this is too low of compression. Tested with all plugs out, that’s all I did. Was remove all spark plugs. Then tested each one. Tested all but one. All came out to about 120-125psi each.
spark plugs were very worn, 3 snapped in half trying to take them out.
1 Answer
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20/02/2023 5:27 pm
Sounds a bit low, I don't know what the spec is for that engine but I'd expect somewhere around 150-160 psi. You might want to do a wet/dry test or leakdown test to see where compression is being lost.
https://easyautodiagnostics.com/gm/2.8L/how-to-test-engine-compression-1
https://www.youtube.com/watch?v=NkrYT76VUeM
