I am having this issue with the car. At around 3500, not matter what load or throttle, it goes lean for a few seconds, then the wb gauge shows pig rich, the car stalls out a few times and clears itself and runs just fine. I can be cruising, trying a wot pull, doesnt matter. Right at aroundf 3500 everytime, it goes lean for a few seconds.

I had a buddy come over a few weeks ago. We swapped map sensors, the exhaust cas and coil on plug. Nothing changed it. last night I tweaked the tune to run in open loop at all times. From my understanding, this essentially deletes the o2 sensor. Car still cutout, so I feel I am safe to eliminate that from being the issue.

Injectors just got back from FIC, tested out good and were cleaned.
No boost leaks.
Checked the crank angle sensor, found nothing wrong.

I am stumped! It seems to be something electrical being it does it at the 3500 mark and no where else. Ive never gotten a cel either.

 

Check throttle position sensor.

 

Tested it with a multimeter, tested good, no erattic jumps

 

Hmm. When mine did this my TPS was loose so just a thought. I'm sure you'll quickly get a boost leak comment but since it's doing it even when you're not getting on it I would think it's something different.

 

yea, and once the car clares itself up after the cutout it runs fine, wot and all.

 

I thought you meant it was fine until you hit 3500 RPM again. That's really strange if you can hit 3500 and have a problem and then be totally fine afterwards.

 

Thats what is driving me nuts about it lol. I can just cruise, and wants it hits 3500 it cuts out, jerks, bogs a bit then clears out and goes fine.

 

Still looking to fix this issue.

I currently have a guy helping me from facebook on the tune a little. He has played with the MAP scaling and it has helped. However, I still am confused how anything I did this winter could have affected the tune this much?

I swapped to a FIC fuel rail from a Buschur rail, and had injectors cleaned. Thats about it for mechanical things that were done.

Any ideas?

 

See if this is useful at all, I had a rogue lean spot around that point that was eliminated with a fuel damper.

https://www.evolutionm.net/forums/ge...n-how-fix.html See post #9