refresher post, from another thread:
https://xoutpost.com/1248213-post75.html
As I stated in the last line of the post from the other thread, above, I am feeling semi-OK, and finally went out to the X today, to see how I left it. The ice is gone from the yard/driveway, so I had no excuse (to self), not to at least pop the hood, start it (if able), and check it out.
I didn't check the fuel pressure, nor vacuum at the F-connector, but it strated up instantly, and I ran it for about 30 minutes, letting the O2 sensors heat up, and the engine running at operating temperature for half that time (after sitting unused for months).
The fuel trims stayed normal (for a change), with the LTFTs at zero, and the STFTs around +/- 1-3. Not at all what I last saw. The MAF at 700rpm read 3.6gm/s to 4.2gm/s, also better than normal. O2 sensors were fine, withthe front sensors on point immediately, while it took 1-20minutes before the rear sensors toact right. Overall, I was pleased.
Since there was no hesitation whenever I pressed the accelerator, I'm assuming that the cause for zero pressure at the Schrader valve, last time I was testing, must be due to a restriction in the 5-ft extension hose, and/or the old fuel pressure tester gauge I was using.
My follow-up visit with my orthopedic doctor is next Tuesday, so if he doesn't plan any surgery, i'll start my planned course of checking everytime related to fuel, from
- 1) draining & filtering the fuel (checking for particulate matter knocked loose by Cataclean in the tank),
- 2) pressure testing the vacuum hose from the F-connector to the FPR (and/or replacing the hose),
- 3) once the fuel has been judged to be free from particulate matter, then I have a new Hengst filter/FPR to install, and
- 4) then i can roadtest it again, to see if the fuel trims stay neutral (or even revert to lean, which I'm used to), and perhaps the X won't stumble on hard turns and curves.
Of course, I will have to get a special permit to drive it even for inspction (overdue since Oct.), but at least I have a short 1/2 mile neighborhood loop I can drive for minimalist testing (no traffic in mid-day). At least it will be a start.
Maybe I'll just wailt until next Oct, after my X5 gets to be 25 y.o., and get to skip emissions testing altogether.