11-18-2018, 12:59 PM | #1 |
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Misfire
Featured on BIMMERPOST.com Earlier this week I experienced my first misfire and limp mode (drivetrain malfunction). I had to clear the code with ISTA to get it to run right again. I took it out for a test drive and beat on it pretty hard a few times and nothing happened. Ran great. Fast forward 5-6 days and a couple hundred miles and it just happened again. All the same misfire related codes with the only specific one being for cylinder #5 in both cases. Other related codes included fuel shut off for that cylinder. I assume this is still spark related though? Possibly dying coil? I also got code 800BAA = 1RSVC: CVBS output, open circuit or not connected. Anyone know what this means? EDIT - nevermind, I found a better description for the code. Seems like the forward camera is inop, or was. I'll diagnose this separately. |
11-19-2018, 10:53 AM | #3 |
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Fair enough. That would be my natural progression unless the replies said "just replace the coil". I hate diagnosing by new parts unless there is no other easy way. In this case, there is an easy test.
I'll swap it from cyl #5 to cyl #1 on the other bank. Rather not do adjacent cylinders. Thanks for the reply. |
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11-20-2018, 08:33 PM | #5 |
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Tonight I swapped the coil and took it for a drive. First time I whomped on the throttle in Sport Plus, it set the limp mode. New code for Cylinder 1, so the code followed the coil. I already ordered 2 coils, 1 as I suspect here and 1 for a spare since they are so cheap!
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11-21-2018, 05:03 AM | #6 | |
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11-21-2018, 10:32 AM | #7 | |
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The longest trouble shooting I had to do was because of warped hinges on the coils. Car would run fine idling and low cruising, but when I got on it it felt like it dropped a cylinder and DTML. ISTA showed where it was happening so luckily I had backup coils and swapped them, the same issue happen. I swapped coils, plugs, chased for a long time. I finally found (after swapping the plug twice and two different coils on the cylinder having the misfires) the two coils I swapped in both had the same issue with the hinge not locking down properly, WHAT ARE THE ODDS!. Drove me nuts. So I prayed for my sanity (because I knew next was injectors) and swapped in the 3rd coil and I think I actually cried a little, perfect running car. Its actually is a love hate relationship with these cars. Sorry for the long explanation but it was a pain trying to diagnose and hopefully this gives a little check list. One other thing, I may be wrong, aren't the stock plugs gapped at .032. I could be wrong on that as I only gapped them to .019 after the tune and didn't check the stock gap. |
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11-23-2018, 05:11 AM | #8 |
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Thanks for the reply. I replaced the coil on Wednesday night and so far so good. Your post is still good information for the future and for others to see.
The only saving grace with these plugs and coils being finicky is that the coils are cheap and plug gap can be adjusted as much as you want (unless the plug got fouled out badly). I bought OEM Bosch coils on RockAuto for just over $20 each. I contemplated just replacing them all but I hate replacing parts for no reason. Especially since the coils on my S62 are all original after 282,000 miles and 18 years of abuse! I did buy a 2nd one to keep as a spare for diagnostics, etc. |
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