Free repair checklist
Read Your Engine Compression Test Like a Pro
A $30 compression tester tells you more about your engine's health than a $150 shop diagnostic. This guide shows you how to test, read the numbers, and diagnose the exact problem — rings, valves, or head gasket — before spending a dime at a shop.
This checklist is a practical starting point. The DIY Mechanic System gives you a clearer path to diagnose the problem, plan the job, and complete the repair.
What this checklist covers
- Decode your PSI numbers instantly — what counts as normal, borderline, and 'pull the engine now' for 4-cylinder, V6, and V8 engines
- Distinguish worn rings from burned valves from a blown head gasket using a $5 can of oil — the wet vs dry test that shops charge $200 for
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