Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
Is it just as the gauge hits 90, or possibly just as the fan kicks in? Just a thought, but perhaps there's an electrical issue with the fan that pulls down the volts to the ECU and that kills it. Try pulling the fuse and/or relay that feeds the fan.
Other random thoughts,
ECU water temperature sender may be failing (I had one on a Rover V8 that was perfect cold, went open circuit around 50C then came good again).
Crank position sensor you've done, cam angle sensor possibly I suppose, although do they usually cause stalling??
My usual old refrain...but have you read the ECU for stored codes? Might be some clues to be had.
Sounds like it could be 'fun' to find this one.....a long time back, a chap I knew ran a small car dealership and he had a really nice 164 24V in. It was lovely...but would stall as you drove along. Loads of folk looked at it but no cure was ever found. Not the same symptoms you've got though.