Its fluffing !
Discussion
Ok so I am back from Caterham , being told that it isnt fluffing at 5900 like it was, and to be fair it wasnt for the 2 hours it took to get back. However , attacking the B16something and heading in towards Norfolk, it started again. So far the plugs,leads,dizzy have all been replaced, it is a Suplight R , and above and below this point it is fine. Flying infact. But if you are on a dual carraigeway it is just where you dont want it. Question is , what on earth is it.....anyone else got any ideas. Is it time to change the ECU on it and upgrade, trouble is what does that cost (Racing BMW's is the priority walletwise) , or would it be something nice and simple?
OK, it almost certainly electrical, being cuased by a duff input on the ECU.
If you can find someone with Easimap (assuming your car runs an MBE ECU) hook up and turn on logging. Drive the car until the fualt condition occurs, then save the log and reveiw it. Look closely at all the sensor traces.
Failing the skills/availability I do think if it is a fault always at specfic RPM my first point of diag would be to change the crank sensor, and if poss check the pick up wheel is not loose on the crank.
If you can find someone with Easimap (assuming your car runs an MBE ECU) hook up and turn on logging. Drive the car until the fualt condition occurs, then save the log and reveiw it. Look closely at all the sensor traces.
Failing the skills/availability I do think if it is a fault always at specfic RPM my first point of diag would be to change the crank sensor, and if poss check the pick up wheel is not loose on the crank.
When does it happen? i had a problem with the main HT lead arcing against the block at intermittant revs. It had been cable tied to the bell housing/ clutch bracket.Start the car and turn the lights out, check for sparks! sounds a bit half arsed but i saw it arc and was able to pin point it.
It happens when it gets to abouot 5900 revs, any gear, on the straight or in a corner. And it seems to be only when it is under load,not when being revved at home........As far as I am aware it is standard as a standard thing under there so any ECU referance should be as the day it was brought into the world !
It was my initial thought to look to the ECU. On wednesday I shall go through all the other ideas you guys have had, and that will leave only one thing - back to the ECU! If it is that , and I end up looking at a replacement unit (eg upgrading) what does everybody recommend, and what would one spend ?
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