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Old 11-04-2012, 12:35 PM   #1
Scooby Newbie
Member#: 193020
Join Date: Oct 2008
Default Recurring P0172 on Stage 3

I've been having a problem for more than the past month that I can't seem to diagnose. I got the car back from the tuner and it ran fine. However, after a couple weeks of driving it threw a p0172 "rich" code. I cleared the code and reset only for the code to come back. Since then, I've cleaned the MAF/IAT sensors, cleaned the air filter, checked for exhaust leaks preturbo, checked vacuum lines and fmic couplers. Nothing obvious that I'm seeing.

When the ecu gets reset, the afrs balance out at around 14.7 or so and corrections tighten up to normal after a few miles of driving. A couple days later, the code comes back. Corrections are maxed out by this time. Interestingly, it only consistently runs rich at idle. Someone take a look at the logs and LV and let me know if I should let the tuner have it back first or diagnose and fix a mechanical problem first. I don't want the tuner to get it back only to mask something that's causing this and I don't want to throw parts at it blindly. Current mod list is here.


The following is a link to the thread I started on the lgt forum. In it are attachments to the latest learning view and some logs. The first log is a cruising log. The second 2 are 3rd gear WOT logs. I have some knock that can easily be addressed, but I don't think the AFRs look out of line. The tune is not completely finished, but when I got the car back, the maf had been scaled and corrections were spot on. Any advice would be appreciated.

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