My '89 325iX is having some very rough idle and stuttering problems when given throttle. I almost didn't make it home the other day, trying to nurse the throttle for the last 1/8 mile or so. I just did the timing betl/tensioner/water pump/etc and this problem didn't show up until after I did that work. That being said it first showed up a few weeks ago and I cleaned the ICV thinking that might be it and it seemed to fix it. Then it started happening again over the last couple days. There's only 137k on this engine (supposedly, relying on the previous owner for that information).
I pulled out the plugs today and did a (dry) compression test using a Harbor Freight compression tester. The results are:
1 - 110psi
2 - 115psi
3 - 90psi
4 - 120psi
5 - 118psi
6 - 120psi
I know those are all lower than the spec in the Bentley manual by about 30psi and the #3 cylinder must have something wrong, but I don't really know where to go from here. Should I do a wet compression test on all the cylinders? Is a leak-down test the next step? Is it possible that I bent a valve in #3 somehow while doing the timing belt?
I pulled out the plugs today and did a (dry) compression test using a Harbor Freight compression tester. The results are:
1 - 110psi
2 - 115psi
3 - 90psi
4 - 120psi
5 - 118psi
6 - 120psi
I know those are all lower than the spec in the Bentley manual by about 30psi and the #3 cylinder must have something wrong, but I don't really know where to go from here. Should I do a wet compression test on all the cylinders? Is a leak-down test the next step? Is it possible that I bent a valve in #3 somehow while doing the timing belt?
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