Xoutpost.com - View Single Post - experimental MAF reset switch: which circuit to interrupt? more complications

workingonit · #16 09-07-2024, 10:55 AM

I checked all of the above at one time or several times...found nothing amiss. I even posted a graph of the O2 sensors functionality. The upstream O2 sensors were replaced by the previous owner with Bosch pieces, about 4k miles ago. I'm not sure about the downstream units, though.

I rebuilt my DISA with the G.A.S. kit, with the upgraded O-ring, and used a wrap of Teflon tape and Silicone paste to ensure a good seal and easy install, without damaging the new O-ring.

I had an exhaust cam fault pop up, replaced it with a VEMO part (made in Germany), and it fixed the fault. I've replaced no other sensors, except for the two cheap MAFs.

The PO also replaced the secondary air valve and vacuum tubing, FPR, and a lot of other parts in engine bay and suspension. He did a good job, since the truck runs and drives perfectly fine. Except for not replacing the deteriorating clutch fan (I did, with a hi-powered electric fan, as soon as I could, after we swapped cars), I can find no fault with his work, all done about 4k miles ago.

I mentioned that my fuel trim readings get worse as my short trip, low speed, stop and go normal driving persists, and that I've noticed that the fuel trims (long term, of course) trend downward if & when I actually do some highway driving. Well, I'm going to get to make an 80 or so mile trip to my mom-in-laws ranch today (my wife is driving her Lexus, separately, because she's staying there overnight) for a family event. I'll observe the LTFTs falling, I expect.

Also, since I'll be coming home after dark, I'll be using my X5's headlights for the first time ever, while driving. Never drove it after dark before.

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