I have P8 on my car.

Its played up today. Car wouldnt start. Cranked fine though.

no spark, no fuel. pump running fine and injectors had power but no pulse. coil power but not pulsing again.

changed CPS still nothing, changed ign amp still nothing. everything else except ECT sensor had been changed before so i know they were all okay.

checked the ecu loom for power and resistance in the right places, all was well.

was about to give up so checked the ecu to make sure the baby board or chip wasnt loose.

Both were fine. Still didnt start.

so got pissed off and twatted the ecu.

starts and runs fine now WTF.

anyone else had a similar wierd fault??

only thing i can think is a loose connection in the ecu itself or maybe perished cable in ecu occasionally moving enough to break connection and kill engine.

other than that im stumped.

Only thing i can think is to go across ALL the soldered joints on both ECU boards and redo them all just in case one is dry.

Any other ideas???

 

Dry joint i'd say, unless it was a coincidence it started as you twatted it! Have you tried giving it a tap with the engine running?

I mean the ecu, not your cock by the way

 

thought you might say dry joint I wonder how much heat the board can take

 

Yeah,poor solder joint,it should be obvious when you strip it down.I had the same thing with an UNO turbo years ago and it was the boost sensor joints that had failed,right in the middle of the board.

 

Sounds like a nodder stuck in the exhaust

 

common problem is the zif socket on the baby board

 

Was the wiring plug in ok my old sap broke down years ago when the plug was still in the clip but had popped out slightly

 

This will be your problem...

Tighten the contacts up on the socket so they make a better contact.

 

If in doubt give it a clowt.

 

zif socket being the bit the chip goes into??