Quote:
Originally Posted by X5chemist
Scooby-Doo asks which listed fitting fits?
|
Scooby-Doo ??? You're telling me your age; I was already 19 when that premiered on TV in 1969, and of course, I never watched it.
As for which fitting works, actually, none do. Fitting #8 (m8x1)
#8 on the previously posted list
screws halfway down on the fuel rail Schrader, but doesn't give me any confidence on the thread match. I'll have to use a second fitting to attach it to the gauge's hose.
necessary connection to join to the gauge
The premium Teflon tape would probably seal it, but there's another problem...the fitting doesn't have a "valve depressor" inside.
this one isn't even close to working
If I remove the valve core from the Schrader, and join two fittings (plus Teflon tape), I can probably test the pressure. I should probably wear a raincoat, and have my wife stand-by with a fire extinguisher, because I can envision fuel going everywhere.
Why can't I find any mention on the internet of the thread size used on the early E53 (M54) fuel rail? it's like a BMW state secret or something. What did other people use? I can't imagine that the Harbor Freight, and other cheap testing kits have a "BMW-approved" fitting, while my kit doesn't (they're all probably made in the same factory in China).
Meanwhile, in related news: I went ahead (while I had the covers off) and sprayed 3 more cans of carb cleaner, and found zero leaks, again, paying particular attention to the rubber boots, vacuum junctions, injector O-rings, vacuum manifold O-rings, and any BMW plastic connectors. I also waited until everything was warmed up before I observed the MAF readings from idle (700 rpm) to 1k, 1.5k, 2k, and 2.5k. They were consistent with or better than on my previous graph, so I didn't save it.
I also did a couple of WOT pulls, that brought the highest readings, which were off-scale on my small screen. I also did repeated "tap" tests (suggested by
EODguy) on the MAF, from finger taps to semi-hard raps with a big screwdriver...the MAF never acknowledged it. I don't think it's the MAF. Or leaks, or O2 sensors, or anyting underhood.
Perhaps, I need to drop the shield over the FPR assembly, and see if there's a vacuum leak there.