Hi all, was hoping for some insight.
I have a 2013 C2, 3.4L. 29k miles

2 weeks ago I did the Gundo hack. I have don't the same mod on my 996's and 997 with similar results.

Yesterday, I threw a code P0172 and the display said Fault engine control Possible to drive on.
P0172 translates to System too rich bank 1
I cleared the code and the same one came back later today after driving ~30 miles. The idle also seems a little more rough than usual.
Any idea on what could be causing this? Any relation to recently doing the Gundo hack?

Thanks

 

bump

 

You don't happen to have a BMC filter by any chance? They have been known to oil up the MAF which can through out the ECU.

 

No BMC Filter. Car is completely stock minus the Gundo hack.
The car is also idling a little rough but when I bring the RPMs up a slight bit it is fine.

From what I understand there is no MAF sensor in this car, just a MAP sensor - is that correct?
Normally my first instinct would be to clean the MAF, but not sure what to do in this situation. I tried some techron fuel cleaner without any luck. Any thoughts?

 

Both are subject to contamination, but unless you have something causing them to get contaminated, then it is less likely to be the MAP. Short of a failure that is. Couldn't hurt to have them cleaned anyway.

 

The plot thickens...
So I couldn't help but think this situation had something to do with my cent Gundo hack.
I went back to the muffler shop and had the car lifted up - There appeared to be soot around the clamps between the side and center mufflers. This likely indicates a leak so we took off the clamps and re-tightened them on both sides.
I took the car for a long spirited drive after that and everything was going great for 30 mins.
Then out of nowhere I get the error: PSM Loss Possible to drive carefully & Start/Stop operation deactivated & Fault engine control possible to drive on. The car also started to misfire at this time.
I turned the car off then on and everything cleared. This has never happened before.

I can my scanner on the car and there were no codes present.
But there were a handful of pended codes:
p0172- system too rich bank 1
p1382
p0301 - cyl 1 misfire
p0302- cyl 2 misfire
p0303 - cyl 3 misfire

Not sure where to go from here...Does anyone have any thoughts?

 

Sounds upstream, doubt Gundo is causing this. I am not a master Pcar tech, but sounds like MAF/injection/plug/coil type stuff. With the lower miles I would lean towards a failing MAF, no harm in pulling it out and hosing it down with some MAF cleaner see if that give you any love.

 

I disconnected/cleaned my MAP sensor without any luck.
Will try new map sensor and new spark plugs this weekend.


Just to confirm, the MAP sensor is under the front bonnet near the brake vacuum lines correct? as shown in this video: I just found it a bit peculiar it is not located anywhere near the intake plenum/throttle body like it was in the 997. Is there another MAP sensor somewhere in this car?

 

Air pressure sensors are probably used for multiple applications. It would need to be in the intake to work for fuel / air management. My understanding is there is 2 in the intake. Pre and post TB.