Issue was non-start for months since thrashing it through salt water floods (I know, but thats why I have it
). It drove home, parked up, then refused to start when I went to start it the following w/end or since. I finally got round to giving it some attention last w/end.
I hooked it up to Faultmate and my P38 for a jump and went cranking. I noticed on faultmate that it wasn't showing any revs. On my DSE this would indicate a failed crank sensor but the 3..9 doesn't have one. I figured that the alternator wasn't earthing properly and with a bit of prodding and excessive cranking she finally spluttered into life. After a couple of prods on the throttle she settled into a nice idle. I took it for a good spin and parked it up again.
A week later it was back to no start so I took off the alt to clean up the earthing surfaces . While taking it off I noticed one of the wires was down to a single strand. Sorted that, put it back on and up she fired, yippie!! Took it for a good thrash and parked up again.
I hooked up faultmate again to see what was different and I noticed that it still doesn't show any revs while cranking until it actually fires up hence the original question.
Incidently it appears that one of the O2 sensors is not working so even though it fired first time this morning, I'm not out of the woods yet.
So are you saying there are two signals, one from the coil and one from the alternator? Any chance one is for rev counter one for the ECU or what do you think?