 Low Compression?, What am I doing wrong? |
 Dec 8 2006, 01:53 PM
Post
#1
|
|
|
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 |
 |
 
|
 |
Replies
|
Dec 8 2006, 02:42 PM
Post
#2
|
|
|
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....
|
|
|
|
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 |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
| Lo-Fi Version | Time is now: 12th October 2025 - 07:30 PM |
Powered By IP.Board
© 2025 IPS, Inc.