How To Do A Compression Test On My Car?

[DFG 5OH]

Yea yea, i've read lots of "How To's" but i just wanted a good explanation from a mustang guy.

So start typing.

Matt

 

[Green 94 5.0]

take the coil wire off, remove a spark plug, screw the compression tester in, crank the motor until the needle on the gauge stops rising, write down the number, repeat for every cylinder. thats all there is to it.

 

[dstanggt50]

Whenever I do mine, I take all the plugs out, and while its cranking open the t/b by hand, and what the other advise stated, stick compression gauge, crank until guage stops w/coil wire off.

 

[JRPony]

1. Remove all spark plugs. This allows for even cranking/breathing.
2. Disable fuel by disconnecting the fuel pump relay or pulling the fuse. If you only disable spark, then you will still get fuel injected during cranking.
3. Install compression gauge and crank car with the throttle fully open.
4. All the cylinders should be within 10% of each other.
5. It would help to put a battery charger on if you have one so that full cranking speed is achieved.

 

[BPA]

take all the plugs out... make sure u get compression on each cylinder 3 times and then go to the next cylinder.

 

[DFG 5OH]

so test each cylinder 3 times, cut the fuel off from the switch in the trunk...

 

[AznStanger3v]

unplug the coil
undo the fuel pump relay
take out all the plugs
have the tb wide open
crank the car about 9 times for each cylinder
do every cylinder at least 2 times