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Title: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: Carlo1170 on April 26, 2015, 06:09:58 PM Kind of odd. So I've got a misfire, and after i converted my A-Box to an M-box (with Bosch settings) it's finally giving me the following codes:
P0300- Random/Multiple Cylinder Misfire Detected P0305 - Cylinder 5 Misfire Detected Seems pretty straight forward right? Not so fast. Decided to dive a little deeper and do a log, which logged Misfire Count per cylinder. No misfire counts on cylinder 5, but Cylinder 4 is full of them. Now I'm thinking because I'm getting a random misfire code along with that cylinder 5 code, that because the cylinders are right next to each other, its just picking it up? What do you guys believe to be more accurate? I would assume the logs would pinpoint the issue? Has anyone else seen this issue? Haven't gotten a chance to switch around coil packs yet, but multiple pulls and logs only point to cylinder 4, and the codes are the same everytime (random misfire and cyl. 5). Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: vwaudiguy on April 26, 2015, 07:44:32 PM I've seen this before. Sometimes the earlier me7 cars will mis-report misfires when it comes to DTC's. I would go off the logs first. Had a v6 once reporting misfires on a cylinder, when after doing a visible inspection we found the cam lobe had lost its egg shape on the cylinder next to it. Changed the cam, and everything was good.
Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: Carlo1170 on April 26, 2015, 07:58:33 PM That is what I was suspecting since I'm getting both Random and that Cyl 5. I believe the ECU is just confused as to where its coming from.
Anyone else have input on this? Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: nyet on April 26, 2015, 09:04:50 PM Absolutely. Do not trust what the ECU is saying, i've seen several situations where it gets the cyl wrong. It generally gets the bank right though.
Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: Carlo1170 on April 26, 2015, 09:58:40 PM Absolutely. Do not trust what the ECU is saying, i've seen several situations where it gets the cyl wrong. It generally gets the bank right though. So you're saying my knock detection through my actual logs could be incorrect? Or are you just referring to the cyl. 5 misfire code? I think I'll do some coil swapping tomorrow, that should pinpoint the issue. Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: nyet on April 26, 2015, 10:33:02 PM Don't trust the ECU to tell you exactly which cyl.
Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: Carlo1170 on April 27, 2015, 05:57:41 PM Well.. Did some swapping around today. Swapped Coil 1 for Coil 4.. Still had the same misfire detected through logs (only misfires in Cyl. 4), albeit lower, and wouldn't trigger a CEL this time. The plug is cylinder four looked great, not wet and a nice color. Gap was .025.
Just for diagnosing purposes, I also swapped my ICMs around, with no change.. Any further ideas? Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: nyet on April 27, 2015, 09:25:33 PM Try 5.
Title: Re: B5 S4: Code for Random and Misfires in Cyl 5. But logs show differently. Post by: Carlo1170 on April 28, 2015, 07:37:02 PM I'm at a loss.. but the issue is fixed haha
I swapped Coil 5 for Coil 2.. Did a few logs and I'm getting 0 misfires. Not really sure what happened, but I'm okay with it. |