wrote in message
oups.com...

snip

If it happened after the service I'd check every single connection
and
wire loom. I had a car in the past where some halfwit mechanic had
severed a cable and created an intermittent fault.

I've also seen the same fault after a not so good 'service' by a
halfwit, trouble was it was the owner who was the halfwit and had to
come pleading to a garage to sort out his ****-up.

I have also seen halfwit owners make a perfectly safe braking systems
into a lethal death traps - and cleaned the mess up afterwards when
their car didn't stop...

As for the garage and their diagnostics, I know some here won't like
it
but many garages and their diagnostics are out of their arse.
They'll
tell you all sorts of crap about what they checked when they haven't
even made any attempt to look at the problem. They would rather do
straight forward jobs and let you work out the fault by deduction.
I'm not familiar with that engine so beyond that can't help. Regards
the spark plug test that others have discussed, forget modern
engines,
I handled a HT lead on an '83 1.2 Astra OHV engine many years ago
and
got a shock. Not enough to cause me damage but it still hurt - never
tried that test again!


Yes, and that system is low powered by modern standards.