The Wankler

iTrader: (14)

Well, I removed most of the stumble I get by re-wirring the grounds. I may have missed one. I did not do a ground at the ECU. But did get the others, Engine Harness under the UIM, both coils, and alternator. Howeverm when I hit 3800 rpm I go pretty lean. My wideband reads around 10:1 WOT until 3800 and it immediatly goes lean around 17:1 - 20:1.

any help appreciated.
Chris

My mods listed below.

sleepydave

what are your fuel mods? im just speculating but it seems as the secondaries may not even be firing, have you checked that the injectors are pulsing? are you tuned for the hybrid? ems?

The Wankler

iTrader: (14)

I am not runing any performance fuel mods right now. I did do the Paralell fuel mod. I have not installed my FCD yet. And I am not even pushing much boost. I have not installed ,y Walboro fuel pump either. I wanted to try to work out the kinks before i move forward.

I have not checked to see if they are pulsing. How do I check?

Could bad grounding cause such a lean spot?

arghx

iTrader: (3)

uhh dude my friend had a 3800 hesitation and the only ground he did was to the ECU, and that fixed it. You should have started with that (ECU controls the whole EFI remember?) instead of making it last.

The Wankler

iTrader: (14)

I did do the UIM ground, which is the ECU ground. I have not splice into the harness next to the ECU. Is that what he did?