Celica Forums General Discussion General Compression Test Results

Hey All!

Wanted to get some opinions/recommendations about my compression test numbers on a 253k 2ZZ-GE.

Cylinder #1: 180PSI
Cylinder #2: 175PSI
Cylinder #3: 150PSI
Cylinder #4: 180PSI

Before the test, I had driven it around for a while to let it warm up, and let oil circulate, so as unfortunate as it is, I trust that these numbers are accurate.
Is there anything I can do to help these numbers, or more likely, anything I should avoid doing?

Cyl 3 compression is low. Engine must run rough.

The cause may be carbon deposits on valves or piston rings.

I had the same low compression problems with CYl 1. Engine was shaking on idle and low RPMs, smoother at high RPMs. Seafoam, STP additives ect. did not help. A few reputable shops could not solve the problem, recommended engine swap, about $4k. Damn.

On assumption valves or piston rings were leaky due to carbon deposits, I used GUNK Motor Medic engine flush $4 at Walmart:

https://www.walmart.com/ip/Motor-Medic

Used half strength, half bottle, idled engine 15 minutes. Dumped oil was black and sludgy. Repeat another engine flush and compression was even on all cylinder, engine smooth like new. I routinely cruise at high speed and long trip. Engine smooth and strong after 320K miles.

That's actually why I wanted to post about it. Engine runs really smooth, never have any issues with it. I'll look into that, for sure. Thank ya.