Quote:
Originally Posted by weehe126
I did C2,4 and 6 compression test 3 times each. I also cleaned the seat a bit to see if there was a leak, but results were within 15psi. C4 did drop to 165 as the very last measure, but that could have been from the oil cooling.
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Did you take the spark plug adapter out each time? That is the biggest issue normally is that some small piece of gunk gets in there and creates a small leak. How many revolutions did you do on each test? A leakdown is very nice too if you have the tester. Like was mentioned earlier you can put a small amount of oil in the cylinder too to try and seal the rings better to see if it gets better.
A boroscope that goes on your phone is very cheap also (like $20) and they actually work pretty good. Another option if you are thinking there is any damage, but I wouldn't at this point. I would redo the full compression test twice more and see how they all match up. If they are consistent then a leakdown is in order. If there is still a problem you are probably going to be looking at injector seals, head gasket or valve seals/seats.