Quote:
Originally Posted by jfoj
If the tach is not moving, then most likely a crank sensor which will cause the fuel pump not to run beyond the prime function and the injectors and coils will not trigger/fire.
This is a video the tach on a E46 330 cranking for reference - https://www.dropbox.com/s/k7tmin8qek...4_056.mp4?dl=0
As for an OBDII App, HIGHLY suggest OBDFusion, its cheaper than Torque and properly supports Wideband O2 sensors. |
This is just a comment for this tach-bounce test. I'm not keeping track of all the different directions this thread is following.
Background: my '01 3.0 failed to start. Cranked, but no start. Turns out for me it was the fuel pump, confirmed bad, but not replaced yet. In the quick, pre-troubleshooting research, I came across this thread.
The tach bounce CPS failure test seemed like a good and easy one, BUT! ...
unlike the E46 tach shown in that video, which clearly measures from zero on up, the tach on my E53 seems to start at around 200 RPM. I.e., there's a 1 for 1000, a tick mark for apparently 500, then about 3/5 of that distance lower is the unmarked beginning tick, which I will assume to mean 200 RPM.
When I did this test on my car, the tach did not move at all. But I noticed this feature of my tach and (apparently correctly) concluded that the test is not valid for my car. If it had bounced past 200RPM, it would have registered and exonerated the CPS, but no motion (as I saw) did NOT indicate a bad CPS.
So I continued with regular troubleshooting - charged battery, listened for fuel pump at fuel filler (silent), checked fuel pressure on the fuel rail (zero), pulled up the rear seat and checked applied voltage at the fuel pump (12V for a couple of seconds when the key goes to ON = OK, so DME, electrical is all OK), checked fuel pump resistance = 70 kOhms = YIKES, applied 12V from spare battery directly to fuel pump ... Nothing ==> OE Pierburg Fuel pump is bad at 174k miles.
BTW, the Pierburg pump has a "USA" stamp in it and the part number 7.22013.07 on it (no trailing .0). Looks like I'll be paying around $180-$200 for a Pierburg replacement 7.22013.57, which cross-matches to the original one.