Hi all,

Just returned from a 600km round trip with my car. For some of the
trip the car was travelling at 120/130kmh (5th gear @ 4000RPM) for
about 20mins at a time.. I noticed a slight rumbling from within the
exhaust-pipe/muffler somewhere, it sounded like a bunch of 'mini-
backfires'.....

My timing is ok, and I'm using 95 octane petrol. I can't find a hole
in the exhust anywhere and it has just passed emissions tests about 8
weeks ago.

I'm just wondering if I decreased the spark plug gap would this help
(it's at 1.1mm @ present).. I know that at higher Rev's the sparkcoil
has less time to re-fresh and generate the HT spark, so by reducing
the spark gap, to
say 0.9mm this might help? Or, are these coils spec-ed to perform up
to, say 8000RPM? If so, it might be the spark-coil is on the way
out....

Just out of interest, it's advisable to reduce the spark-gap anyway
when you turbo-charge you car, yes?

CathalH
'95_Red_AZ-3_1.5_DOHC(but not for long more....)