Compression test information

[DCJ98GST]

I am doing a compression test today. Just wanted to make sure I am doing it right.

I am going to follow the VFAQ but that is for a 1G.

But for a 2G to cut power to the ignition and injectors is all I have to do is pull the fuse labeled engine/motour. Is there anything else? I did a search and this is all I found for a 2G. Is this right?

And is it better to do the test with the engine hot or cold. I would think that it would be more accurate at operating temperature, but I heard that it is not good to pull the spark plugs when its hot.

Thanks

 

[RipperXX]

I dont see how it could be a bad thing to pull the plugs after the engine has warmed up.. just wait untill it cools back down to re-install them, i guess it COULD have something to do with the expanding and contracting of metal but i dont see how that could do anything.

 

[Bd1000Eclipse]

Originally posted by DCJ98GST
I am doing a compression test today. Just wanted to make sure I am doing it right.

I am going to follow the VFAQ but that is for a 1G.

But for a 2G to cut power to the ignition and injectors is all I have to do is pull the fuse labeled engine/motour. Is there anything else? I did a search and this is all I found for a 2G. Is this right?

And is it better to do the test with the engine hot or cold. I would think that it would be more accurate at operating temperature, but I heard that it is not good to pull the spark plugs when its hot.

Thanks

you HAVE to do the test when the engine is fully warm and with the throttle plate all the way open.. take the plugs out when warm you wont have a problem.

 

[Defiant]

Originally posted by DCJ98GST
I heard that it is not good to pull the spark plugs when its hot.

In days of yore, and crappy aluminum alloys, you _could_ pull the threads out of an aluminum head when hot (aluminum starts to go plastic at about 400°F, and nobody uses a touch of anti-seize on sparkplug threads anyway), but our motors come from Japan, and they have a pretty good grasp of How To Use Decent Materials.
Just do a driveway warm-up, let it run for five or ten minutes. You mostly want to get a little heat to the pistons to bring them up to size, and that happens very quickly.