Hey all! 2014 MK6 Drivers edition GTI with 77k on the odo. Cobb intake and Cobb AP Stage 1+ About a year and a half ago I had my intake manifold runner position sensor take a dump on me, so I ordered a new manifold and got to work on a carbon service. Got the manifold off, intake ports cleaned, new seals for the injectors, car back together.. Wunderbar. Car runs like it's brand new.
Fast forward to a month ago and all of a sudden I'm leaking fuel. Determine it is the injector seal for Cyl 1 (see photo), off comes the manifold again. Replace the seals on the injector, carbon cleaning touch up, and back together again it goes. Car ran fine at first until a couple of hard pulls in 2nd, and up pops a P0101 cell. I also intermittently get a "too lean off idle, bank 1" CEL (P2177). Car idles rough.. but I can run to the store with it without a lot of drama. Power is down and gas mileage is awful, also there is an RPM surge up to like 1500 RPMs when coming to a stop, and it slowly settles back down to 750. I cleaned the bajeezus out of the MAF with MAF cleaner, and i'll be honest, I did dielectric grease the shit out of most of the electrical connectors when re-installing the manifold to make it easier to remove next time I have to, because I'm sure I will. Not sure this would have anything to do with it, but felt the need to mention. Maybe it could impact voltages? Shot in the dark.
Where should I begin a deep dive? While troubleshooting I noticed the Cobb intake filter was starting to deteriorate.. car has been sitting since I noticed that. Is it possible the filter is just not passing air cleanly? Would running the car without the MAF connected tell me anything? As I was typing this I had the thought to run the car without the filter attached to see how it idles. Intermediate shade tree mechanic, willing to try anything. Thanks in advance for suggestions.
TL/DR:
P0101 CEL after removing intake manifold for fuel leak due to bad injector seal.
Fast forward to a month ago and all of a sudden I'm leaking fuel. Determine it is the injector seal for Cyl 1 (see photo), off comes the manifold again. Replace the seals on the injector, carbon cleaning touch up, and back together again it goes. Car ran fine at first until a couple of hard pulls in 2nd, and up pops a P0101 cell. I also intermittently get a "too lean off idle, bank 1" CEL (P2177). Car idles rough.. but I can run to the store with it without a lot of drama. Power is down and gas mileage is awful, also there is an RPM surge up to like 1500 RPMs when coming to a stop, and it slowly settles back down to 750. I cleaned the bajeezus out of the MAF with MAF cleaner, and i'll be honest, I did dielectric grease the shit out of most of the electrical connectors when re-installing the manifold to make it easier to remove next time I have to, because I'm sure I will. Not sure this would have anything to do with it, but felt the need to mention. Maybe it could impact voltages? Shot in the dark.
Where should I begin a deep dive? While troubleshooting I noticed the Cobb intake filter was starting to deteriorate.. car has been sitting since I noticed that. Is it possible the filter is just not passing air cleanly? Would running the car without the MAF connected tell me anything? As I was typing this I had the thought to run the car without the filter attached to see how it idles. Intermediate shade tree mechanic, willing to try anything. Thanks in advance for suggestions.
TL/DR:
P0101 CEL after removing intake manifold for fuel leak due to bad injector seal.