Thefatmanwrx Posted May 19, 2018 Share Posted May 19, 2018 Going to do a compression test on my 2001 wrx tomorrow while changing the plugs what numbers should i be looking for will be doing on a cold engine which I know isn't ideal but I'm suffering with a bad back (violins playing) so will take me over an hour to strip it (no exaggeration) any help will be appreciated thanks in advance. Quote Link to comment Share on other sites More sharing options...
Phillip1993 Posted May 20, 2018 Share Posted May 20, 2018 Compression pressure should be between 142 and 171 and no more than 10 psi difference between all 4 1 Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 20, 2018 Author Share Posted May 20, 2018 Is that on a cold engine Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 20, 2018 Author Share Posted May 20, 2018 126 across the board on cold engine how much trouble am I in Quote Link to comment Share on other sites More sharing options...
Phillip1993 Posted May 20, 2018 Share Posted May 20, 2018 that way to low i get about 150 on cold 1 Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 20, 2018 Author Share Posted May 20, 2018 That's what I thought leak down test next to try and pinpoint the issue worst thing is engine has less than a 1000 miles on it Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 20, 2018 Author Share Posted May 20, 2018 I know this is a long shot but could valve clearance cause low compression (i know I'm probably clutching at straws) Quote Link to comment Share on other sites More sharing options...
Tidgy Posted May 21, 2018 Share Posted May 21, 2018 i'd be more worried about any readings between them. but 126 across the board is fine on a cold engine 1 Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 21, 2018 Author Share Posted May 21, 2018 Thanks for the reply tidgy i 're tested them using a compression tester today with a cap of oil in each cylinder and no change (heard it was meant to increase pressure if it were rings but didn't change) the other concerning thing is it takes at atleas t 7 cranks to build 126psi Quote Link to comment Share on other sites More sharing options...
Tidgy Posted May 25, 2018 Share Posted May 25, 2018 If your worried then i'd pop it down to a specialist and get them to have a look. given the results i wouldnt be too worried myself 1 Quote Link to comment Share on other sites More sharing options...
Thefatmanwrx Posted May 26, 2018 Author Share Posted May 26, 2018 Thanks again for the reply gonna have a leak down test performed and will update when completed Quote Link to comment Share on other sites More sharing options...
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