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Negative Fuel Trim on Bank 1

Zyigo

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Jul 24, 2019
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2005 VZ SV6
Hey all,

After a long saga, I've got my car up and running with a new ECU. Unfortunately I have long term fuel trim issues. Currently they are at -13.7% on B1 and -3.1% on B2. The car is clearly running a little rich with a little smoke out of the exhaust on the occasion and every now and then, it takes a few times to turn over when starting.

I know you'll probably say O2 but I swapped them side to side and it didn't change the negative bank.

I should say that I just changed injectors too. Could a dodgy injector install/injector o-ring result in these symptoms?
 

Skipy

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Oct 16, 2021
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Be Calais v6
Hey all,

After a long saga, I've got my car up and running with a new ECU. Unfortunately I have long term fuel trim issues. Currently they are at -13.7% on B1 and -3.1% on B2. The car is clearly running a little rich with a little smoke out of the exhaust on the occasion and every now and then, it takes a few times to turn over when starting.

I know you'll probably say O2 but I swapped them side to side and it didn't change the negative bank.

I should say that I just changed injectors too. Could a dodgy injector install/injector o-ring result in these symptoms?
I have same problem did you fix it
 

Fu Manchu

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Pre cat or post cat sensor?
 
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