Got a new 2.4 vvt EcoTec, and it's just about 'worn in'. I plan a compression test, at home, soon, to use as a benchmark for future tests. What kind of readings should I expect, that is what should the numbers be? I know they should all be close in value.
They should all be within 25% of each other and no less than 100psi. I'd expect to see somewhere around 150 or higher though on a fresh engine. 1800-200 isnt uncommon.
ASE Master Auto Technician & Advanced Engine Performance Specialist
GM Mark Of Excellence Platinum Award (Engine repair)
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Good news and bad news. All readings were around 175, which is about what my '96 2.2 was when new. I thought the higer compression 2.4 would've been more, but I could be wrong. Bad news is that my CEL is on. I guess the 'puter didn't like cranking the engine without a fuel pump OR disconnected plugs!! Got a fix for this? Could AutoZone's 'free computer scan' thing cleanly clear the code?
You pulled the plugs and did a compression test on a brand-new engine?!? And I thought I was bad...
Joel
2007 Cobalt LS 4dr, 2.2L, Auto, bone stock deluxe poor man's package.
For what it's worth, engine had about 1500 miles on it when tested. Two plugs also had too much gap...nice job, GM!
