Hello, Wanted to ask for your help diagnosing potential head gasket on my 2013 Prius at 220K miles. *Please see attached view in cylinder 1 where I think I see coolant droplets? symptoms - slowly losing coolant from reservoir can’t find external leak - started with misfire (rattle) on cold starts then progressively moved to misfire shudder for 1-3 seconds every stoplight once engine heats up - otherwise drives normal avg 45-50 mgs - no codes (but did have p301 cyl 1 misfire months ago) - cyl 1 spark plug looked either lean or maybe a tiny bit washed tests - compression (cyl 1 - 120 with other 3 between that up to 130) - exhaust gas reservoir test (passed) -ignition coils passes What I’ve done - cleaned egr valve, cooler, pipe, and intake manifold - new spark plugs, air filter, oil change with filter, air filter - new injectors
Was that the first EGR cleaning? QUOTE="David Wallace, post: 3620940, member: 223720"]started with misfire (rattle) on cold starts then progressively moved to misfire shudder for 1-3 seconds every stoplight once engine heats up - otherwise drives normal avg 45-50 mgs[/QUOTE] Very likely coolant in combustion chambers.