ECMlink Need help. Bucking, popping under half throttle

[enasnitsi]

I have a log attached of when its happening. Under half throttle and above it will start popping and backfiring. Boost is set to 15 psi and holds there. No knock. Wideband reads 12:1 even though log shows leaner. First time it happens is 15 seconds into log. Let me know if you can see anything. Checked and fixed all boost leaks. Holds 30 psi. Swapped coils and replaced plugs. Fresh E85.

 

[jdoherty420]

Have you had any luck resolving this issue? I'm having a similar issue with my '97 GS-T. Only difference is it's just random when it happens. My rpm's drop to 0 and it will buck a couple times, then I'll get some loud pops out of my exhaust and it will go right back to normal. its so random when it happens tho. Yesterday it stalled on me twice as I was going down the road. I'm not getting any codes at all either. I just rebuilt my head because it burned up an exhaust valve in cylinder 3. I took the opportunity to do a light port and polish on my head while I had it all apart. I didn't take much off, I just smoothed out all the rough cast and gasket matched the intake ports on the head and manifold. Also did a 3-Angle valve job and ut a fresh cut on all my valves. This issue was not there before I did the rebuild.

 

[lil corb]

Have you checked to see if the TPS is within spec? What does it show volts wise at 0% throttle then at 100% throttle?

 

[DSMer541]

Pull the injectors out and inspect them. Could have some goo build up from the e85 clogging one or more of the injectors.