"Dave Plowman (News)" wrote in message
...
snip
dwell measurement. Of course at the end of the day, things like the
ECU
can only really be verified by substitution. However, the failure
rate of
these is very much less than the average mechanic might believe.


The problem is, when they fail it's often due to another fault further
down the line, unless that fault is corrected the new ECU is destined
to go the same way as the old one, hence the unthinking /
knowledgeable mechanic (which there are plenty in back street
workshops I sorry to say) will see an disproportionate number of
(repeat) ECU failures.