High fuel trims at 2,500 RPM only

mercredi 24 juin 2015

Searched, found several fuel trim issues, but none that were this RPM based.

Idle is about 6.6 g/sec, no vacuum leak indication

No load, 2,000 RPM, LTFT around +6
2,500 RPM, LTFT around +14
3,000 RPM, LTFT around +9

Steady driving
2,000 RPM, 40 MPH, LTFT around +6
2,500 RPM, 50 MPH, LTFT around +16
2,850 RPM, 55 MPH, LTFT around +8

all the numbers above are after STFT stabilized around 0.

No Air Pump
Evap connected or disconnected
recent rebuild, but did not do it out of the box

The high trim goes away as soon as you accelerate, hitting cruise control button is enough. It is a step between about 48 and 52 MPH with cruise control on. Car is getting 27 MPG while all this is going on according to ultra gauge.

What turns on at 2,500 RPM?
When do secondary fuel injectors start to come on?

Um, help?


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