Hello all, time for another frustrating update.
So, I replaced the spark plug tubes. This made no change (well, no more oil on the valve covers) but after two test drives, no P1126, fuel economy seems to have returned but the car just feels "slow" overall and the induction noise is muted. It just doesn't sound or feel 100%. Additionally, I found two threads that mentioned the contacts within the electronic throttle control on the throttle body can be misaligned and for someone, this was causing their 986 to run rich at idle. I opened it up, cleaned up the electrical contacts, but overall it looked healthy and clean. Simultaneously, I also purchased a new electronic change-over valve for the resonator flap. I got a little encouraged when I found the rubber vacuum boot attached to the old change-over valve was stiff and looked tired. I replaced it with new rubber vacuum hose. All of this resulted in no change to engine operation and after about 120 miles of test drives, P1126 returned and this time with a P0107. I had this code briefly a few months back, but I didn't have my battery tender at the time and the car had been sitting, so I assumed it was related to low voltage, reset the code and continued troubleshooting. This is the first time it has returned.
According to the Bentley manual, P0107 isn't listed for DME 7.2 but Durametric reported it with the same verbiage as listed that in the Bentley manual for DME 5.2.2.
I've read a couple of posts on P0107 and the MAP sensor is internal to the DME, so it seems the advice goes one of three ways:
a. Reset code and see
b. A bad MAF might be the culprit
c. Replace the DME
Anyone have any experience with P0107 and P1126? My MAF data makes it appear the MAF is functioning properly. Is it possible it's an intermittent failure with the MAF? Any help or ideas will be much appreciated! Thanks.