Quote:
Originally Posted by DeliciousTuning
We have seen this issue in a couple cars over the past two years. What we will notice is the long term fuel trims will max out (-35%) and because of that the short term fuel trims will then try to max out in the opposite direction because it is too lean (+25%).
Problem is we have shut off all long term fuel trims and it should not be correcting for long term at all yet the ECU still corrects.
Now we did experience one car with this exact same issue and they had after market HID's (made in China). The aftermarket ballasts were only sealed in plastic, not metal like they should be. Well these ballasts give off a lot of RF signals (plastic does not protect against that) and therefore interrupt the signals to the ECU, especially on the CAN lines.
When this was removed it fixed the problem in that one car. Do you have any electronics aftermarket parts in the vehicle?
Cheers,
William Knose
Delicious Tuning
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Set closed loop target to 14.7 and ltft will go disabled