 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, 02:42 PM
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DSM Tech Wizard  Group: Members Posts: 2,256 Joined: 10-January 01 From: central IL Member No.: 10 |
Three major things that affect compression.... rings, valves, and the head gasket. Having the engine warm is fairly important, can typically boos compression readings by 20-30 psi. Basically just trying to get everything to expand so that it seals as it would if the engine was running.
I'd make sure you get a good gauge. If the engine runs and you are only getting 85psi, I'd guess the gauge is bad. -------------------- The fastest car I own is a minivan....
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Posts in this topic
silentsprintero Low Compression? Dec 8 2006, 01:53 PM
turbohcar The dipstick popping out is a common problem, espe... Dec 8 2006, 02:01 PM silentsprintero Yea the motor has 92k. I took the hose from the va... Dec 8 2006, 02:03 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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