In article ,
Michael Chare wrote:
It can be a nuisance if the ECU switches to 'get you home' mode and the
car then does not run properly. Used to happen to my wife's Golf. By the
time you got to a VW garage the fault had cleared.

Common one on my last car was the crank position sensor - a hall effect
type - having an intermittent fault. Likely something akin to a dry joint.
When that happened, the ECU got its tach signal from the cam sensor only
and went to limp home mode. Fixed timing for ignition and injection. But
would often clear itself after the engine cooled down. Luckily, the fault
code was stored. That car had 3 CPS in the 15 or so years I owned it.

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*If only you'd use your powers for good instead of evil.

Dave Plowman London SW
To e-mail, change noise into sound.