997 Turbo Running Lean
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Joined: May 2012
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From: Toronto
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997 Turbo Running Lean
Hello Everyone,
I am having an issue getting my car tuned correctly. For some reason no matter how much fuel we tell the ECU to add, it keeps the AFR around 12.4 at WOT. The ECU does not add more fuel even though the AFR is lean and the tuner says it does not look like a boost leak.
We are really stumped as to what the problem is. Tuner is suggesting the fuel pumps may be tired or some type of data reporting issue. I wonder if there is something more obvious we can try first? Data Logging was done with new fuel filter and primary O2 sensors.
My vehicle information:
2007 997.1 Turbo
Chassis Mods:
RWD Conversion
LWFW
Stage 5 Axles
DSG Suspension Computer
Semi Solid engine + Transmission mounts
GT3 LSD
Numeric Racing shifter + Cables
Stage 5 Demon Speed axles
ATI harmonic balancer
Engine mods:
D088 charge pipe
D088 Plenum – Regular Size
GT2 – Intercoolers
3.5 Custom Xpipe exhaust/ No Cats
I am having an issue getting my car tuned correctly. For some reason no matter how much fuel we tell the ECU to add, it keeps the AFR around 12.4 at WOT. The ECU does not add more fuel even though the AFR is lean and the tuner says it does not look like a boost leak.
We are really stumped as to what the problem is. Tuner is suggesting the fuel pumps may be tired or some type of data reporting issue. I wonder if there is something more obvious we can try first? Data Logging was done with new fuel filter and primary O2 sensors.
My vehicle information:
2007 997.1 Turbo
Chassis Mods:
RWD Conversion
LWFW
Stage 5 Axles
DSG Suspension Computer
Semi Solid engine + Transmission mounts
GT3 LSD
Numeric Racing shifter + Cables
Stage 5 Demon Speed axles
ATI harmonic balancer
Engine mods:
D088 charge pipe
D088 Plenum – Regular Size
GT2 – Intercoolers
3.5 Custom Xpipe exhaust/ No Cats
Last edited by mikestyle; Oct 1, 2020 at 05:50 PM.
Registered User
Joined: Sep 2009
Posts: 2,658
From: GTA, Ontario, Canada
Rep Power: 236
Hello Everyone,
I am having an issue getting my car tuned correctly. For some reason no matter how much fuel we tell the ECU to add, it keeps the AFR around 12.4 at WOT. The ECU does not add more fuel even though the AFR is lean and the tuner says it does not look like a boost leak.
We are really stumped as to what the problem is. Tuner is suggesting the fuel pumps may be tired or some type of data reporting issue. I wonder if there is something more obvious we can try first? Data Logging was done with new fuel filter and primary O2 sensors.
My vehicle information:
2007 997.1 Turbo
Chassis Mods:
RWD Conversion
LWFW
Stage 5 Axles
DSG Suspension Computer
Semi Solid engine + Transmission mounts
GT3 LSD
Numeric Racing shifter + Cables
Stage 5 Demon Speed axles
ATI harmonic balancer
Engine mods:
D088 charge pipe
D088 Plenum – Regular Size
GT2 – Intercoolers
3.5 Custom Xpipe exhaust/ No Cats
I am having an issue getting my car tuned correctly. For some reason no matter how much fuel we tell the ECU to add, it keeps the AFR around 12.4 at WOT. The ECU does not add more fuel even though the AFR is lean and the tuner says it does not look like a boost leak.
We are really stumped as to what the problem is. Tuner is suggesting the fuel pumps may be tired or some type of data reporting issue. I wonder if there is something more obvious we can try first? Data Logging was done with new fuel filter and primary O2 sensors.
My vehicle information:
2007 997.1 Turbo
Chassis Mods:
RWD Conversion
LWFW
Stage 5 Axles
DSG Suspension Computer
Semi Solid engine + Transmission mounts
GT3 LSD
Numeric Racing shifter + Cables
Stage 5 Demon Speed axles
ATI harmonic balancer
Engine mods:
D088 charge pipe
D088 Plenum – Regular Size
GT2 – Intercoolers
3.5 Custom Xpipe exhaust/ No Cats
Thread Starter
|
Registered User
Joined: May 2012
Posts: 293
From: Toronto
Rep Power: 40
Update: It turns out one of the two fuel pumps was weak.. This was extremely hard to diagnose as fuel pressure was normal and the car ran fine. I don't know how long the car was running lean but it could have lead to an catastrophic event if it got worse. I am not sure when a check engine light would have come on but its a good reminder to do a data log every once in a while. After this experience I ordered the AeroForce gauge to replace the chrono, its pretty neat as you can program custom alerts if something starts to go wrong. Such as AFR over 12 at 80% throttle.
Last edited by mikestyle; Nov 30, 2020 at 08:00 AM.
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Joined: May 2017
Posts: 411
From: Exton, PA
Rep Power: 39
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