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BMW 3-Series (E90 E92) Forum
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E90 320i misfires all the time
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05-26-2020, 08:50 AM | #1 |
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E90 320i misfires all the time
Hi I'm new here and already looking for some insight..
So i have a 320i e90 engine n46, that is my wife daily driver, it has 130k on the clock and the car was burning oil faster than petrol. I have changed the PCV valve in case it was the cause and as it did not help I decided to do Valve stem seals, all went alright. Finish assembling the covers and I started the car to test that's when i found that the idle was rough, ista+ found misfire errors (0029cc,0029ce and 0029cf) in several cylinders, cylinder 2 and cylinder 3. Up until now I tried disconnecting the coil of each cylinder to test which one was misfiring , cylinder 3 is the cause, then I swap over coil number one and spark plug number one to the cylinder number 3, and it does the same. I thought maybe the injector dirty so I removed the fuel line and clean all the injectors , still same issue, so I swap over injector 3 for injector 4, same issue and the last test I did was swap the lead of cylinder 4 with cylinder 3, and the problem still happens on cylinder 3... I really don't know what else to test.. sorry for the length on this post . |
05-26-2020, 03:55 PM | #2 |
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I don't wanna be the bearer of bad news but sounds like you messed something up while installing the valve seals. I had an issue similar to this and took it to a mechanic he did a smoke test and smoke was coming out from cracks in the valve cover. I would certainly do a smoke test with whatever a cigar or a party smoke machine etc. Also check compression on all cylinders who knows if some rockers came off
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elmelocoton0.00 |
05-26-2020, 10:43 PM | #3 |
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thanks for the info, do you think a crack in the valve cover will affect only cylinder 3? where do you blow the smoke to check on the pcv valve connector ?
I will check compression later on.. Last edited by elmelocoton; 05-26-2020 at 10:57 PM.. |
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05-30-2020, 01:28 PM | #5 |
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Drives: 2008 E92 328xi
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Yep that's what I thought it would be you messed up something in there. No biggie you got it resolved good stuff
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