cpressl90

Tired of fighting this issue so im wondering if you guys can help. Attached is a log with most driving conditions.
Problem is that when cruising at slower speeds and vacuum is low the car runs pretty lean. ive tried adding in fuel to the VE table but it doesnt matter. around 8.5 minutes in is a good example of the issue. Ive got the throttle cracker disabled because if its on the car dies when i clutch in with out pedaling the throttle. This is my first tune so go easy

36lb FIC injectors
220/220 cam
.600" lift
114LSA

cpressl90

Has anyone had this issue besides me?

minytrker

iTrader: (13)

Need to smooth out your fuel table. Have you tried running CL and using the fuel trims for part throttle?

cpressl90

Ill try CL with trims to see what happens this weekend. So far ive just done open loop and added fuel where its lean. that why at 30-35 kPa the VE is higher than 40-50 kPa. When the computer interpolates does it just use the values nearest or multiple values?

tblentrprz

I would install vacuum gauge to see what actual vacuum the motor is producing. Cruising with throttle barely open generally produces the highest engine vacuum. Low vacuum at cruise would only occur on a high load (steep incline) with throttle opened up. Any DTCs. Assuming speed density tune (not MAF)?

cpressl90

Only DTC is EGR because its gone and MAF because it off. The rain finally cleared up so im going to put it back in CL and go for a drive

cpressl90

it ended up being that the computer was looking at the secondary VE table because this is a P01 PCM And MAF was failed. i updated the OS where it only uses one VE table and turned the throttle cracker back on it it runs just fine now

gametech

iTrader: (1)

Those little details can really run you in circles. At least you figured it out.