2500avalanche
Well-known member
OK, I am going to attempt this tomorrow. I bought the tool (Not expensive at all), and I want to knwo the correct way to do the test on a TY? Any hints and suggestions would be great:tup:
How to properly do a compression test
- Thread starter 2500avalanche
- Start date
WyoSyclone
Active member
Re: How to properly do a compression test
- take the ECM fuses out
- take all spark plugs out
- screw in the compression tester
- turn motor over via starter... you will see pressure rise and then stop.... this is your pressure reading
- move on to next cylinder
- if one is greater than 10% low, squirt a little bit of oil into the cylinder and test again. If it rises you may have a ring/land problem... if it doesn't rise you may have a valve/seat/guide problem.
Not much to it!
- take the ECM fuses out
- take all spark plugs out
- screw in the compression tester
- turn motor over via starter... you will see pressure rise and then stop.... this is your pressure reading
- move on to next cylinder
- if one is greater than 10% low, squirt a little bit of oil into the cylinder and test again. If it rises you may have a ring/land problem... if it doesn't rise you may have a valve/seat/guide problem.
Not much to it!
autoaddictions
Active member
Re: How to properly do a compression test
I also cycle the cylinders with the same amount of compression strokes usually 5 or 6.
I also cycle the cylinders with the same amount of compression strokes usually 5 or 6.
ghettosled
SYTY SUPERSTORE
Re: How to properly do a compression test
may consider hooking up a battery charger to maintain good cranking power.
may consider hooking up a battery charger to maintain good cranking power.
SY2932
Administrator
Re: How to properly do a compression test
Make sure that you have the hose connected SECURELY into the cylinder head. The yahoo who had my car before I bought it managed to strip out a good portion of the threads in the head. Despite having the hose bottomed out in the hole, I got to about 130 psi before what was left of the threads let loose and I couldn't hear anything for about half an hour...
Make sure that you have the hose connected SECURELY into the cylinder head. The yahoo who had my car before I bought it managed to strip out a good portion of the threads in the head. Despite having the hose bottomed out in the hole, I got to about 130 psi before what was left of the threads let loose and I couldn't hear anything for about half an hour...