 Low Compression?, What am I doing wrong? |
 Dec 8 2006, 01:53 PM
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Newbie Group: Members Posts: 3 Joined: 22-January 06 Member No.: 781  |
So i take my car into my auto mechanics class today to do a compression test. Remove all 4 spark plugs (which look perfect) and the fuse for the fuel. Keep in mind the gauge we have is old and that is what I think is the problem, but it read 85psi on the spot across the board. How important is it to have the car warm, i only drove it across the parking lot. also, i notice that my dipstick pops up about 1/2" almost every time i open my hood, what's causing that? i know my compression is higher than that, it pulls strong, so what am i doing wrong?
-Chris |
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Dec 8 2006, 02:01 PM
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DSM Tech Wizard  Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
The dipstick popping out is a common problem, especially with higher mileage motors. It means you've got some blowby in the crankcase. I usually just grab some pliers and pinch the dipstick tube a bit at the top (while the dipstick is all the way down) and that keeps it from popping out again.
I believe that you have to get the engine to near operating temp to get an exact compression test. Not sure though, I forget. Rob help me out on this one. -------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Posts in this topic
silentsprintero Low Compression? Dec 8 2006, 01:53 PM
silentsprintero Yea the motor has 92k. I took the hose from the va... Dec 8 2006, 02:03 PM AWD DSM 1 Three major things that affect compression.... ri... Dec 8 2006, 02:42 PM black92_tsi_awd Having equal readings across the cylinders is a go... Dec 8 2006, 04:46 PM silentsprintero Thanks for the advice!! I'll borrow my... Dec 8 2006, 11:25 PM
awd4kicks BTW- An engine will not usually even fire when the... Dec 8 2006, 11:53 PM |
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