Grim.Badger 15 Posted July 17, 2006 Cold engine, accelerator peddle fully depressed, counting from the cambelt end. The engine is an 8v 1.9 GTi with 112k on the clock and no known history. Cylinder 1: 208 Cylinder 2: 212 Cylinder 3: 224 Cylinder 4: 220 Cylinder 3 went to around 200 quickly then slowly to 224. Cylinder 4 was slow and the spark plug was swimming in oil. I think the oil was sitting above the plug when I unscrewed it as it had normal deposits when I cleaned it up. The engine spat oil out everywhere through the dipstick a while ago and I think the oil has been sat on top of the plug ever since, but that doesn't explain the slow compression. Should I run it for a bit, let it cool and test it again? What could cause the slow compression? Share this post Link to post Share on other sites
Jonmurgie 2 Posted July 17, 2006 I believe your supposed to do the test with a HOT engine aren't you? Share this post Link to post Share on other sites
Grim.Badger 15 Posted July 17, 2006 I believe your supposed to do the test with a HOT engine aren't you? That's what it says on the box, but I'd heard you can do it on a cold engine if you think that the rings might be going. Besides I really can't understand why it wouldn't work on a cold engine; what exactly is the difference between a cold engine and a hot engine? Share this post Link to post Share on other sites
TEKNOPUG 3 Posted July 17, 2006 The figures would be more accurate on a hot engine but it should still show up any major differences between cylinders on a cold engine. Share this post Link to post Share on other sites
Grim.Badger 15 Posted July 17, 2006 That's good enough for me, I only have enough time and money to chase big problems. Share this post Link to post Share on other sites
Bono 0 Posted July 17, 2006 that doesn't look too bad, my current engine manages 200psi on a good day with one cylinder scraping 145 Share this post Link to post Share on other sites
