How To Do a Compression Test [DIY]
Here is how you run a compression test. It’s actualy quite simple, but a lot of people skip certain steps and end up getting wacky numbers. Running a compression test should always be done before installing a turbo on motor.
You can rent a compression tester from Autozone, should be like 40 bucks but you get it all back when you return it. This is what it looks like
- Take out your spark plugs (Remove all of them, and leave the holes open, the only one that should not be open when performing the test, is the one with the tester screwed in)
- pull the ECU fuse so you dont get any fuel or spark to the motor.
- Screw the tester into the number one cylinder
- Put the accelerator all the way to the floor, and crank the motor for a few seconds.
- Record the PSI reading for that cylinder
- There should be a button somewhere on the tester to reset it, be sure to do this before moving on to the next cylinder.
- Take out your spark plugs (Remove all of them, and leave the holes open, the only one that should not be open when performing the test, is the one with the tester screwed in)pull the ECU fuse so you dont get any fuel or spark to the motor.
- Screw the tester into the number one cylinder Put the accelerator all the way to the floor, and crank the motor for a few seconds. Record the PSI reading for that cylinder There should be a button somewhere on the tester to reset it, be sure to do this before moving on to the next cylinder.
Here is a video on how to do a compression test
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http://www.compressionfittings.org.uk/ compression fittings