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Maybe the signal lead from the autobox ECU is left floating and needs to be 'tied' to either +12v or ground. that might explain the intermittant start?
I'll have a look at the Bentley wiring diagrams again and see if I can find the autobox connection.....
Otherwise, it could be a fault in the loom in the Sportster with an ittermmittant connection? That could be a nightmare to find. I wonder if your DME is detecting a fault somehwere and going into 'limp home' mode? (assuming BMW's have such a thing?)
Do you have the diagnostic plug wired to see what fault codes there are?
I assume you had it running quite well before when you drove to the aborted SVA test?
...peter
I've had a look and there is a a white/violet wire that goes from pin 6 on the DME module 2 to the autobox controller. It's marked as a digital signal so I think its some kind of diagnostics connection? I'd forget that idea and look for a loose connection in your loom.
Thanks guys
After more digging around, we discovered a loose connection with the throttle sensor, and also the MAF sensor was knackered (easy enough to replace with the one from my non-drivable BMW!!). Result: engine now revving fine again
Doesn't explain the intermittent start though, we think it only happens when the engine stalls (and not always then), maybe it doesn't send the code back to the key sometimes when this happens?
Still can't get the speedo working and haven't had time to weld in the seat belt anchorage bar, so I know it will fail the IVA, but will just try to get as many jobs done between now and Friday as I can, including fitting the hopefully IVA-proof new seats!!
Tim
Looks like the intermittent start problem was caused by a loose earth connection, probably as a result of digging the ECU out and putting in back in amongst the wiring jungle too many times!
Had a great run out to the garage for a test drive this morning, about 15 miles round trip, was going really well (wish I knew what speed I was going, but it felt quick!!).
Must sort out those wobbly front wing stays though ....
Looks like the intermittent start problem was caused by a loose earth connection, probably as a result of digging the ECU out and putting in back in amongst the wiring jungle too many times!
Had a great run out to the garage for a test drive this morning, about 15 miles round trip, was going really well (wish I knew what speed I was going, but it felt quick!!).
Must sort out those wobbly front wing stays though ....
