Lean at low vacuum cruising
Thread Starter
Teching In
Joined: Jul 2020
Posts: 23
Likes: 4
From: Illinois
Lean at low vacuum cruising 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
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
Last edited by cpressl90; Jul 29, 2020 at 07:22 AM.
Thread Starter
Teching In
Joined: Jul 2020
Posts: 23
Likes: 4
From: Illinois
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?
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
Likes: 178
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)?
Thread Starter
Teching In
Joined: Jul 2020
Posts: 23
Likes: 4
From: Illinois
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
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