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04-27-2021, 06:28 AM | #1 |
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Lost cylinders
Hi Folks,
Car showing lost cylinder codes below. When I parked up the car went into limp mode and the engine was shuddering badly. The car runs lumpy when accelerating hard under 2.5k revs. Both before and after this issue. There is a new engine in this car which was replaced by bmw post rod bearing issue. Only 3k miles on it. Any ideas? |
04-27-2021, 06:30 AM | #2 |
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check compression of the motor, if you have compression across all cylinders this is a component failure.
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04-28-2021, 01:07 PM | #5 |
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There are a ton of reasons for these codes and I've gotten them when I've had both a failing TBA and had a leak at the header to mid pipe connection.
Both times the issue would resolve with an on-off cycle. Out of balance / rough running and 5k RPM limit, etc |
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04-28-2021, 03:11 PM | #6 |
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On-off clears the codes but It's running lumpy below 2.5k revs all the time.
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04-28-2021, 03:51 PM | #7 | |
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Quote:
https://www.m3post.com/forums/showth...=953477&page=5 https://www.m3post.com/forums/showthread.php?t=1430901 could be fuel evap / breather valve. what's the age / total mileage of the car and was the engine remanufactured or rebuilt? |
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04-28-2021, 04:27 PM | #8 | |
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Quote:
002796 is secondary air pump no activity detected. It is also throttle adaptation value is incorrect. Do you know if they are original throttle actuators? Did you or the dealer just put gas in it? fuel tank breather valve.
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04-29-2021, 04:36 PM | #9 | |
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Throttle actuators were done on the old engine so I presume they were transfered across onto the reman but can't be sure. |
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04-29-2021, 04:39 PM | #10 | |
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Throttle actuators were replaced on the old engine. I'm assuming they were transfered onto the new engine. |
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04-30-2021, 12:03 PM | #11 | |
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Also think not sure 2796H/10134 is about throttle actuation or maybe something you get along with limp mode Last edited by dpaul; 04-30-2021 at 12:30 PM.. |
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04-30-2021, 03:08 PM | #12 | |
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There wasn't an H available on 002796 002796 is showing up as P1411, DME: Secondary-air pump relay, activation and P1634 DME: Throttle adaptation values incorrect.
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05-01-2021, 06:38 AM | #15 | |
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Here's how I read it: 2796H just means hexadecimal 2796 /10134 is just the decimal conversion of 2796 So search for 2796 as a BMW hex code - https://bmwfault.codes/ shows the definition for 9 different DMEs For most DMEs the code is about throttle activation, for one it is about the secondary air pump. None are about DTML. The caveat is that there is no listing specifically for the MSS60 DME. But Mike Benvo reported it as "2796 Motor emergency programm activated" for the S65 motor. I don't know where he got that information but he is knowledgeable. And this makes the most sense to me, given misfires on 4 cylinders Last edited by dpaul; 05-01-2021 at 06:55 AM.. |
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05-03-2021, 07:33 AM | #17 |
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That's interesting. I found different interpretations in my installation of ISTA, the same as I found on BMWfault.codes:
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05-24-2021, 05:09 PM | #19 |
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I just got 2B3C and 2B3B, replaced the ignition coils and now it runs perfect again.
But I didn't get the 2796-code, and since you lost cyl all in the same cylinder bank it shouldn't be the ignition coils.
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