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Long term fuel trim question

Old 07-22-2014, 10:38 AM
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2006 E55 AMG
Long term fuel trim question

There's a 6 to 8 % discrepancy between my left and right bank LTFTs. After re-setting the LTFTs to zero, the right bank trims will climb to and settle somewhere between +6 to +8% while my left bank trims will settle somewhere between 0 and +2%.

I've switched the left and right O2 sensors - no change in the LTFTs.

Do these LTFTs indicate a problem? If so, should I be exploring an air leak or fuel delivery issue on the right bank?

Advice from those in the know will be appreciated
Old 07-22-2014, 10:53 AM
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2003 W211 E55, 2003 W220 S600
if swapping the O2 sensors did not change the trims then it seems like a fuel delivery problem. May be a bad injector.
Old 07-22-2014, 11:24 AM
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Try swapping the injectors side to side next, and see if the condition follows.
They're really easy to get to once you unbolt your inlet elbow from the drivers side.
Old 07-22-2014, 03:50 PM
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Yeah, thanks Chris and Shardul. I'll switch injectors and see where that takes me

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