View Full Version : Weird O2s, look at the log

06-22-2004, 05:19 PM
Alright so recently I put a new built engine into my talon, and it's been running pretty weird since.

Car: '92 Talon
Turbo: FP Green
Motor internals: Forged, 8.8:1
Head: Stock
Cams: '92/'94 combo (what the previous owner said)
Intake manifold: Stock
IC setup: FMIC
Electronics: 3" GM MAF, TMO stage 3 chip, SAFC
Fuel system: Walbro 255 feeding a -6an line to the rail... no AFPR
Stock injectors

Anyways I've been having some weirdness with the car, while this engine was in a different car it all worked fine. But once in this car, it seems to studder for a bit then drive ok. Then it will drive fine and studder.

I was thinking I had too much fuel pressure (which i probably do, but that isn't the problem) but it ran the same pressure and worked fine on the other car.

Should I just start pretty rich and work my way down? Or does anyone suspect it is more than just some afc settings?

I'm just trying to get the car to run okay for emissions then I will change the stock injectors/exhaust for better stuff.

So here is my log, the low fuel trim is at 136% so my ECU thinks I'm lean but the o2 spikes all over the place. I've tried leaning it out some and richening it up some, but only by a few % and that didn't make a difference.

06-22-2004, 05:36 PM
Where's the log?

06-22-2004, 05:40 PM
Good question, I attached it ??

I'll try again