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Engine cutting out briefly
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08-16-2016, 05:41 PM | #1 |
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Engine cutting out briefly
lately, my engine has been cutting out very briefly. It doesn't typically stall, it will just lose power and then it comes back again.
I checked the LTFT and the bank 2 is ~+20% on the highway. It drops to close to zero at idle and into the single digits in higher throttle positions. Do you think whatever is causing the LTFT to be so high could be causing the cutting out? If not, what other parameter should I be checking/logging? What would cause LTFT to be high on the highway but not at idle or in under high throttle positions?
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
2000 Chevrolet Corvette Z51, 11.4 @ 123 2005 Saturn Ion Redline, 14.1 @ 100 (sold Jun-2013) Last edited by tb30570; 08-16-2016 at 05:50 PM.. |
08-16-2016, 06:11 PM | #2 |
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What is Bank 1 LTFT?
What are the AFR's? Post a log? What fuel? Tuned? If Bank 1 LTFT is very different than Bank 2 then you may have an injector issue in Bank 2. Usually the injectors leak which results in very negative LTFT's on that bank. This is not your case, but still points to an injector issue.
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08-16-2016, 06:21 PM | #3 | |
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What parameters do you think I should log? I just installed 2 rebuilt injectors on bank 2 because I was getting a rich condition at idle on bank 2. No more rich condition at idle, but now I have a new problem I guess. I was wondering...if the injectors are rebuilt, are the values printed on the injectors still accurate?
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
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08-16-2016, 07:00 PM | #5 | |
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08-17-2016, 11:25 PM | #6 | |
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08-18-2016, 10:07 AM | #7 |
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I don't think rebuilt injectors would have the same flow values as the originals. That may be the issue.
How long have you given the LTFT to adapt? What do the STFT look like? |
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08-18-2016, 11:12 AM | #8 |
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I would say at least one of the injectors on Bank 2 is giving you trouble and running leaner than it should. As a result, the DME is enriching the entire bank. This is bad because now some of the cylinders are running overly lean, and some overly rich, but the average is coming out correct. This is why the injector calibration values are critical. We must trust them otherwise the individual cylinders could be running far from the correct AFR.
I had a similar issue when my #6 injector was leaking. The LTFT was very negative... the DME leaned out the entire bank to compensate for the leaky injector. So #4 and #5 was too lean, #6 was still to rich. I pulled the plugs and saw that the top of the #6 piston of bright and shiny, the excess fuel cleaned off the carbon. #4 and #5 were running lean judging by the color of the plugs.
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08-18-2016, 07:36 PM | #9 |
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have you reset adaptations? if not the dme will still be adapted to the old injectors.
I had a similar issue where I could feel a slight misfire between 2k and 5k RPM. Looking at logs showed lean AFR (15-16 to 1) both banks,maxed out negative LTFT and maxed out positive STFT. I was also getting codes for bank 2 post cat o2 sensor (delayed reaction rich to lean). odd thing was it cleared up post 5k rpm and AFR was fine..... reset adaptations and AFRs are perfect LTFT and STFT are within plus minus 10% and the code hasn't returned (it's been 2 months). unless you're planning to sell the car in the near future I've never understood why people would buy used injectors that are prone to failure (being a pre 10 revision) from an unknown source. for me the time and convenience of not breaking down, not having to work out what the problem is and not risking damaging an engine is worth far more than a couple of $100. Try resetting adaptations if that doesn't work go buy yourself some new injectors install them and call it a day. |
08-19-2016, 08:45 AM | #11 | |
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if you reset throttle adaptations be sure to wait 30-40 seconds before starting the car otherwise the car won't idle properly and you'll think you broke something.... |
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08-19-2016, 09:37 AM | #12 |
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Yea I'd skip throttle adaptation. Most annoying adaptation to work with when it goes bonkers. Good tip on waiting though, I always wondered what worked.
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08-19-2016, 09:53 AM | #13 | |
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09-01-2016, 09:06 PM | #14 |
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If this is what you mean, then yes
If you mean something else, then no and I don't know how
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
2000 Chevrolet Corvette Z51, 11.4 @ 123 2005 Saturn Ion Redline, 14.1 @ 100 (sold Jun-2013) |
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09-01-2016, 09:07 PM | #15 |
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I recorded some logs. Where can I upload them?
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
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09-01-2016, 09:17 PM | #16 |
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When I figure out how, I'll post the logs.
The ECU may have done some learning because the logs I recorded didn't look the same as the live data I was looking at a while ago. Bank 1 and 2 are not that much different anymore on the highway. Both are in the teens at times, but I didn't see either one jump over 20. The engine did stumble a few times, but I can't even see where in the logs. Today, the engine went into limp mode and I pulled the codes. The code was a P2AA3 camshaft sensor outlet signal interference. I couldn't find anything about this code, but I did find a few articles that said camshaft sensor failure could lead to engine stumbling. Do you think that's what is causing the issue?
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
2000 Chevrolet Corvette Z51, 11.4 @ 123 2005 Saturn Ion Redline, 14.1 @ 100 (sold Jun-2013) Last edited by tb30570; 09-07-2016 at 04:30 PM.. |
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09-01-2016, 09:38 PM | #17 |
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I figured out how to post data logs. There are 3 of them.
mixed driving: http://www.datazap.me/u/tb30570/log-...9?log=0&data=1 highway: http://www.datazap.me/u/tb30570/log-...9?log=1&data=1 idle: http://www.datazap.me/u/tb30570/log-...9?log=2&data=1
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2008 BMW 335xi Coupe 6-speed, 12.8 @ 107
2000 Chevrolet Corvette Z51, 11.4 @ 123 2005 Saturn Ion Redline, 14.1 @ 100 (sold Jun-2013) |
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09-02-2016, 11:01 AM | #18 |
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Looks like you might have a bad injector in bank 2 judging by how slowly it goes full lean when you let off the throttle, and it never actually reaches full lean. Trims seem okay though. Bank 1 is also slow to lean out, but not as bad and bank 2.
Not sure what that cam code it about. I'd clear it and see if it comes back.
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09-02-2016, 12:14 PM | #19 |
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I cannot replace one injector with a new one on the same bank as a legacy model. Replacing all three is $700. That's not pocket change, so I thought I'd try rebuilt injectors for $610 less.
Last edited by tb30570; 09-02-2016 at 07:45 PM.. |
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09-02-2016, 12:23 PM | #20 | |
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http://shop.advanceautoparts.com/p/g...zoneAssigned=1 Running remanufactured injectors on the original calibration values makes no sense.
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09-02-2016, 05:00 PM | #21 | |
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09-03-2016, 11:28 AM | #22 |
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Lots of us, including myself, run aftermarket injectors. Some will say that they are the same as OEM just without the BMW markup.
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