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W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Fuel trims

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Old May 8, 2011 | 04:21 PM
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Fuel trims
My fuel trims have been driving me crazy lately. Short terms will sometimes bounce from -20 (+/-) to +20(+/-) ..both sides...while cruising, at throttle they drop to zero which is good. Most of the time they are in the -teen to positive teen range while cruising. My long terms are now at 5 and 3 after recently clearing my adaptations. I also replaced all my 02s and checked for boost leaks. No leaks, no codes, and car drives well. Any thoughts? Am I stressing over nothing? Thanks.
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Old May 8, 2011 | 06:00 PM
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Originally Posted by 930chas
My fuel trims have been driving me crazy lately. Short terms will sometimes bounce from -20 (+/-) to +20(+/-) ..both sides...while cruising, at throttle they drop to zero which is good. Most of the time they are in the -teen to positive teen range while cruising. My long terms are now at 5 and 3 after recently clearing my adaptations. I also replaced all my 02s and checked for boost leaks. No leaks, no codes, and car drives well. Any thoughts? Am I stressing over nothing? Thanks.
Are you back to stock cams?
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Old May 8, 2011 | 08:26 PM
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Originally Posted by sneakyneon
Are you back to stock cams?
Hell yes!!!! Lol. That was a miserable experience.
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Old May 8, 2011 | 08:39 PM
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oh cams... haha good thing you went back to stock cams...

not sure if it might be related but have you checked your by-pass throttle body?
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Old May 8, 2011 | 09:48 PM
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Have you retuned the car after removing the cams.
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Old May 9, 2011 | 07:31 AM
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Originally Posted by ShangoAshe
oh cams... haha good thing you went back to stock cams...

not sure if it might be related but have you checked your by-pass throttle body?
Hmm..no I haven't. I will check that. Thanks. And yes...haha...stock cams FTW!!!

Originally Posted by shardul
Have you retuned the car after removing the cams.
Yes. But could something like this still be tune related?
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Old May 9, 2011 | 08:29 AM
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oh yes fuel trims can be tune related
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Old May 9, 2011 | 08:58 AM
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Originally Posted by shardul
oh yes fuel trims can be tune related
big time...

but also remember that it typically takes 3-4 days to average out the long term fuel trims (longs are an average over driving a period of time)
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