Welcome Visitor! Please take a few seconds and 
- Joined
- May 14, 2018
- Messages
- 2,059
- City
- Western Mass.
- Vehicle Year
- 1994
- Engine
- 3.0 V6
- Transmission
- Manual
- Tire Size
- 225/70/R15
- My credo
- If it's not broken Don't Fix It!
I have finally collected every thing I need to do the compression tests on my 94 3.0L w/ 147,xxx and I have a few questions I'm hoping someone can answer for me. The first being: What is the purpose of doing a wet compression test?
I know I am supposed to look for a large difference between cylinders but if there is a difference on the wet test between cylinders what does this tell me?
I purchased a pump oil can to squirt oil in cylinders but roughly how much should I squirt in the cylinders to do the test properly? And what type of oil should I use, regular motor oil?
I have never had a motor with weak compression so this is new to me. The reason for the testing is I am trying to track down a shake while under heavy loads. No CEL, Newer ignition system including distributor and coil but acts like an intermittent skip. Fuel pressure is fine so I am thinking injectors but want to be sure the cylinders are fine before dropping the cash for new injectors. The last time I used my compression tester was about 13 years ago when I lost an injector in a Saturn to make sure it was an injector issue.
Any tips and tricks you may have are welcomed also. Thanks for your time and advise.
I know I am supposed to look for a large difference between cylinders but if there is a difference on the wet test between cylinders what does this tell me?
I purchased a pump oil can to squirt oil in cylinders but roughly how much should I squirt in the cylinders to do the test properly? And what type of oil should I use, regular motor oil?
I have never had a motor with weak compression so this is new to me. The reason for the testing is I am trying to track down a shake while under heavy loads. No CEL, Newer ignition system including distributor and coil but acts like an intermittent skip. Fuel pressure is fine so I am thinking injectors but want to be sure the cylinders are fine before dropping the cash for new injectors. The last time I used my compression tester was about 13 years ago when I lost an injector in a Saturn to make sure it was an injector issue.
Any tips and tricks you may have are welcomed also. Thanks for your time and advise.
Last edited:
