P1126 and low rpm hesitation - all troubleshooting listed- Help greatly appreciated!

[ike84]

Originally Posted by porschefan76

Hello all! I think I have some positive news. I want to thank each and every person who chimed in with ideas and helped me through this. I pulled a few posts that I'll quote below, and then get on with what's new!

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OK, so the one thing I have not done since replacing the fuel injectors (first BIG change) was unplug the MAF and see what happens. I know, major oversight on my part in retrospect, right?

I found 3 posts of people with P0107 & P1126 at the same time. In all three cases, a new MAF ended up being the fix. So, I unplugged the MAF this morning. Bank 1 & 2 RKAT 0.0 and FRA 0.99 (I don't think they adapt without a MAF) and O2 sensors looking good the whole test drive, she drove like a bat of hell and wailed like a banshee the way I remembered. Intake funkiness on throttle is gone and oddly enough, some top end noises (valves, chains?) that had me guessing disappeared as well. I've got a new MAF on order and it'll be here Saturday.

So, what I *think* happened was a combination of things. I think I had a leaking bottom o-ring and/or fouling on one of the Bank 1 fuel injectors, because all of the sputtering and intake back firing ceased after they were replaced. I also think I had a failed MAF due to the K&N air filter that I had been meaning to replace but didn't until I had issues. The bad injector had the car sputtering and popping and the bad MAF had us chasing our tail on rich at idle.

I unplugged the MAF before changing the fuel injectors, so I didn't get any change because of injector issues and after changing the injectors, because my MAF appeared to be functioning in Durametric, I never took it back out of the loop.

I will report back on Saturday after I drive it and capture data with the new MAF in, but I'm cautiously optimistic. Regarding the P0107, the ambient pressure sensor is reporting 1010 hPa in Durametric, which corresponds with 1 bar, so that looks to be functioning properly. Right now, the car has codes P0102 and a code for intake air temperature sensor (both are MAF codes, as expected). At the end of the day, I think the only parts changed prematurely may have been the upstream Bosch O2 sensors, but at like $40 each, I will not be complaining!!!

A very sincere thank you again to all of you!!

If you're ever in the lake cumberland area I owe ya a beer!

Congrats on (hopefully) getting it figured out. Let us know what happens!

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