Well i installed my 780cc injectors and perrin fuel rail the other night in preperation for the new and coming turbo. The install went smooth, i scaled the injectors to 660 on the utec and started pulling fuel at about 2k rpms in the 10% load column all the way through the 100% at redline, the Afrs are a little lean (11.8) at some parts but look ok (11.3) at WOT. So i threw a CEL as soon as i started driving around and i thought it was just the good ol' p0234 (engine overboost) but i wanted to check it to make sure, well it turns out to be the p0300!?! Random Misfire? This is the first time in owning 2 Evos that i have ever thrown that code! I deleted the code and it was fine for the rest of the night. Yesterday morning i started my car and the CEL came back on again, i haven't checked the code but im sure it is the p0300.

My question is, does it have to do with pulling fuel at idle? i never touch the 0% load column. It has been happening when the car is cold. I also have 272's but have never thrown a code b/c of them. The car drives fine.
Below is my current Map
https://www.evolutionm.net/forums/at...chmentid=82613

 

Yeah, its common to get that, don't lean out the injectors as much since your at low RPM and closed loop operation at 2000rpm, you have lag on the injectors, and a tip-in lean condition, it could cause a knock that the ECU could confuse as a P0300

 

for me i get p0300 sometime while crusing. but never at WOT. weird

 

That makes sense, i checked the codes about an hour ago and they were 0171 lean condition and p0300, i deleted the codes and added 2% fuel at idle (500-2500rpm in 0% load) and so far no CEL's, thank you for the input Jack

 

i have try this out. i have never get a 0171 code, just p0300 while cruising sometime.

 

yea when your cruising you are in 0% load so just add fuel there, i think you have to add at least 1.5%-2% b/c i threw the code late last night when i was idling at a stop light in the area where i only had 1% added

 

hey NEz136 can you give yor point from 1000 to 5000rpm??

 

Can you explain?

I will do some logging tomorrow and post up my up-to-date maps w/ logs

 

what is fueltrim at 3400-3500rpm, which is at crusing speed at about 80mpg?? my is -4 right now

 

in the 0% load i am not taking out any fuel at that RPM

At 10% load i am pulling around 4% fuel at 3400-3500rpm.
What are your injectors scaled at right now?

 

 

ya im getting a rough idle, and its alittle jumpy and a im getting a CEL im running in 0.

 

Bump kinda want more info on this

 

ok, well after a while of thinking i experimented with my map, i added 20% fuel at idle in the following load cells. 500rpm-1500rpm (0%-50% load) and after 1500 rpm i ramped down to +10% fuel in the 0% load all the way to 6000 rpm. I figured it helped for cold starts runing too lean, i haven't thrown a CEL in a while now, and the car runs great!

 

nice thanks for the update i think im going to have to play around with this.