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Old 01-31-2004, 04:47 PM   #1
thoughto
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Default DIY Compression Test

I did a couple of searches, but couldn't find the answer. How do I do a compression test myself, and possibly a leakdown test? Is it possible to do it yourself if you have average to good technical ability, and where do you buy the stuff to do it? I have had a persistent CEL, off and on for several months, which I have put down to my lightweight flywheel / lightweight crank pulley combo, but I would like to put mind at rest.
Thanks.
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Old 01-31-2004, 05:06 PM   #2
cdvma
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Are you getting misfire CELs?
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Old 01-31-2004, 05:26 PM   #3
mexicanpizza
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Old 01-31-2004, 05:28 PM   #4
thoughto
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Yes, when I got them checked that's what they were. Unfortunately all the Montreal dealership did was clear the codes. I had never had a CEL when I lived in Boulder CO. Then I had to relocate 2,000 miles due to being laid off, and had to pull a wretched U-Haul with me. While pulling the thing up a hill in traffic I felt a severe drop in power and the CEL came on. I pulled off the road ASAP. A very helpful Acura driver stopped to help, and he saw that the coil had somehow "fallen off" cylinder 3. It was Labour day (dealership closed) so he tried to help me get it going again by putting the coil back, but it still didn't work properly. So I got the local dealership to look at it. They ended up changing the coil, and the car was OK for the rest of the trip to Montreal. Unfortunately I started getting these CELs when I got to Montreal, and despite changing and regapping the plugs I have not got them to go away. [As I said, they come and go.] I have an Exedy lightweight flywheel and a TB Racing lightweight crank pulley. I'm about to swap the latter back to the stocker, as I remember many people had misfires with the 2 lightweight things together.
[Sorry for the long reply]
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Old 01-31-2004, 05:30 PM   #5
eightballrj
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1. Buy a compression tester... and some silicone spray if you buy the screw on type for the oring that seals against the spark plug hole.
2. Relieve fuel pressure... pull solenoid off of green plug underneath the passenger footwell above the kickpanel while car is running( this cuts power to the fuel pump), after cars dies, crank engine over for 5 or 6 more seconds.
3. Disconnect coil packs and unbolt them from the heads, pull out the plugs and examine them for abnormalities.
3. Now you should have the coil packs laying outside of you car and the plugs the same and the car should have no fuel pressure.
4. Screw in compression tester ( long reach extension is the one that you will want to use) WITH SILICON SPRAY on the rubber oring that will be contacting the plug hole. The spray will prevent what happened to me from happening to you(extension was stuck in the hole because the alum from the heads bit into the rubber and wouldnt let it unscrew, I had to put loctite on the threads of the hose and lock it to the extension to get it out...)
5. Get into the car and put your foot to the floor on the gas and the clutch and crank the car for about 3 seconds... maybe more.
6.Do 4&5 for each cylinder... and bingo you have done a compression test.

RJ
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Old 01-31-2004, 05:30 PM   #6
thoughto
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Hey MP, that was quick! Thanks a lot.
Oh and you eightball! Wow! Good job guys!
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Old 01-31-2004, 05:31 PM   #7
eightballrj
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Well I guess I did a lot of typing for nothing, haha.

RJ
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