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Model specific boards => Golf mk4 => Topic started by: davidgtrr34 on 25 January 2014, 15:22

Title: compression test
Post by: davidgtrr34 on 25 January 2014, 15:22

I have no power and a knocking noise. the noise gets louder when I rev it and stops when I let off the throttle.
I done a compression test and these are the results

cylinder 1 - 35psi
cylinder 2 - 30psi
cylinder 3 - 30psi
cylinder 4 - 30psi

the car still starts and runs.
can anyone help?

Title: Re: compression test
Post by: maxey on 25 January 2014, 19:12

I have the same problem mate, does it shack like mad?

Title: Re: compression test
Post by: davidgtrr34 on 25 January 2014, 19:25

Not really.but im gettin alot of fault codes and no boost

Title: Re: compression test
Post by: rockmonkey69 on 26 January 2014, 11:05

Those figures seem a tad low, very low. I'm surprised the engine is even running. Looks like its time for a rebuild, new engine or new car

Title: Re: compression test
Post by: xxChrisxx on 26 January 2014, 11:23

Those values are too low to be real. I'd try doing again with a different gauge.

Working order is approx 12.5 bar.
Wear limit is 7 bar.

For anything to be massively below that the timing has to be out, allowing one of the valves to be open.

Title: Re: compression test
Post by: davidgtrr34 on 26 January 2014, 13:19

Ill test again with a different kit. The timing seems to be fine

Title: Re: compression test
Post by: Wayne on 26 January 2014, 20:49

I would get another gauge and try again