Hi All,
This is a long and complex story so excuse me if I miss anything relevant.
Originally came in complete non-runner but with immobiliser code (001176, signal too low, IIRC)and found no chip in the key. I was unable to get the PIN code out of the immobiliser so I took it to my auto locksmith where we found the EEPROM data was completey scrambled. One new immobiliser later, new chip in key and engine started....on 4. Traced this to crossed ignition leads. Don't you love it when customers try and mend their own cars? Customer claims he did not dismantle the key either.
Vehicle stood over night and started perfectly the next day when collected. Car returned the next day, will not start on key.
Diagnosis returned 00514 ignition point sensor and 00515 camshaft position sensor. Not certain with this engine code but most VAG cars return these codes when the engine is not running anyway. Codes still present but flagged as intermittent when the engine is running.
When cranked from cold no rpm is shown on tacho or VCDS but vehicle will start quite happily from a push start. When warm it will usually start ok, the clue is the tacho indicates rpm and the engine will go. In between the tacho will sometimes flicker and the engine can be heard to fire, stick with it and the engine will eventually start.
When it is running it goes really well.
A new crank sensor has been fitted (genuine) and the camsensor gives a good pulse when checked on the scope. The ECU went to ATP for testing with no fault found.
I am pretty sure I checked the sensor wiring but can't see it in my notes so I will recheck that.
The crank sensor is adjustable and I have fitted the bracket back on the original witness marks as far as I can see (access is awful) but I would like to know the setting method for that.
The other possibility I can think of is perhaps the starter motor is electrically noisy, it certainly seems to be quick enough.
Typically as I have had the battery on charge and it is warm today the damn thing starts!
Running out of ideas now.
Shaun