Hi, Just bought a wps so thought I would try it on a misfiring Volvo 1999 model 10 valve, following the software instructions I did a compression test, the figures on all 5 cyls were identical around 167 psi but I'm not sure what the small peaks are , is this a valve reading? with a vacuum gauge I'm reading 13 inHG steady, valve timing ? done vacuum test also with wps , used zoom, see pics
Thanks for your input, I was thinking it was the exhaust stoke as if I put the rulers up in degrees from compression peak to peak 720 degrees the 0.8 bar is in exhaust stroke, Surely There should be no peak on a compression test
Hi, thanks for your input , yes a cylinder leakage is the next test we going to do on this car , I believe the car is similar to the test results as the valve train also sounds a little noisy and could be the symptoms of valve lash.