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Fuel Trim

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94TalonKid

20+ Year Contributor
80
0
Feb 22, 2003
New Jersey
I just got my car running again after the ECU fried. I had to replace the MPI Relay, ECU, Coil Pack, Plug Wires, Plugs, and Transistor. I also redid my timing for other reasons, and that is fine also. I have 550 injectors, stock turbo, 255 pump, and AFPR.

The problem is, now the logger says I am running very lean (137.5%) on the low fuel trim.
I am slightly bucking on low throttle acceleration. If i turn the AFC up to +11% accross the board on low throttle, the bucking goes away for the most part, and the fuel trims read L:100ish, M:92ish, and H: 87ish... but +11 seems very high considering i had it at -7ish before, but I dont know what the trim was with -7, sorry.

I tested the injectors with the logger, and all the injectors bog the car down at idle...#3 not as much, but they all still bog the car so they should be working.

I had the TPS code on my logger at first, then i cleared it, messed with the plug, and reset the ECU and it hasn't come back.... could this still be my problem?

Any help would be appreciated
 
Stock fuel pressure, 36. I ended up replacing the o2 sensor, and I can lean it out to -5% across the board on low throttle and it runs like it used to, normally.
 
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