1g Fuel Trim

[obx tsi]

I was wondering if it is normal for the low fuel trim to fluctuate between about 103 to 121.
I a using mmcd on a palm to log this and was wondering is this normal or is this an idication of a problem?

 

[92awddsm]

I was wondering if it is normal for the low fuel trim to fluctuate between about 103 to 121.
I a using mmcd on a palm to log this and was wondering is this normal or is this an idication of a problem?

No, its not normal unless you are letting one side of the vc port vent to atmosphere and the other is still hooked to pcv. Also, do you have an afc or dsmlink? If not, the 2g mas is causing the problem. You need some sort of fuel control when using a 2g mas.

 

[obx tsi]

My valve cover is routed back to the intake pipe and pcv is hooked up correctly. I was doing some more reading and basically decided it is like you said. I knew i would need the safc but i just did not know that this is how it would act. Thanks for the info. I hope to find a fairly inexpensive safc soon. Thanks.

 

[steve]

I'd guess between the 255 l/h pump overrunning the regulator and the 2G MAF the low trim almost hits 100% at idle but as soon as the regulator goes back online the trims start heading for the basement because the ECU doesn't see enough airflow.

Steve