My car recently started presenting this problem, I have brian crower 272's cams ,full blown & 1600cc injectors -8 feed -6 return fuel lines runing e85 on stock ecu, I have NOT corverted to speed density yet ,buschur ported IM & TB , GT3582 ect ...... I tuned my car and I scaled the injectors at 975 the STFT was exatcly at -0 ,-1 /-0 ,1 and the car idled perfect 4 months ago , suddently my car has poor idle when cold , when I start the car when cold afr is all over the place 11.8 -12.5 then jumps up to 15.4-17.0 untill eventually it shows me ------. if I'm crusing and I come to a complete stop the afr goes to 11.1(rich) and when I push in the clutch to get in first gear and go I have to rev the car to at least 2300 rpm if not it will turn off , can anyone help me , I have checked all the vacum lines, I've checked the maf I changed the battery I have no clue what could it be ?

 

I'd suggest the scaling is off. Not sure why you Have scaled them as low as 900s with 1600cc injectors. Rule of thumb is between 10-15% of the injector size

 

not the same with e85..... mines 1329 and i have 2150cc injectors.

Did you adjust the scaling until your mid trim settled within -+5?

If so then your low trim (closed loop) needs fixed.

 

but it ran fine with 975 before i will try to scale the injectors again.. anything else can be causing this? thanks in advance

 

what do your logs show with idling maf hz? its possible the car is not going into closed loop due to st fuel trim settings not being high enough. Just a guess.

Let me know what the mid trim ended up being

 

ever find the cause? Sorry to revive old thread.

 

If the tune didnt change, I think the E85 got to the injectors/ Fuel system.. Usually running a tank of 91/93 octane gas tune help "oil" the fuel system..