Thanks for your reply. Yes, it was steady with the points. They worked
fine, but the distributor shaft bearing has some wear and the Pertronix
is said to overcome a bit of shaft wobble.
The Pertronix has just two wires. It mounts on a new plate that
replaces the plate on which points and condensor mount. The two wires
pass through a new rubber grommet, then the red goes to 12 source and
black to the coil negative connector. The connections are all tight and
appear to be in good order. .
On Mon, 14 Oct 2002 16:13:37 +0100 "Telewest \(PH\)"
> A fluctuating tach needle indicates that the pulsing of current
> through the
> coil is not consistent, hence the fluctuating idle. Was it OK with
> If so go back and if it is still OK there is a problem with the
> Pertronix or
> its installation.
> ----- Original Message -----
> From: "Bob Howard" <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Monday, October 14, 2002 3:49 PM
> Subject: Pertronix questions
> > This weekend I installed a Pertronix in the 25D distributor of
> > 72MGB-GT. It was easy to do, but now I understand why there are
> so many
> > questions about installation from listers--the instructions are
> > clear and informative, and leave out only one significant piece of
> > information.
> > But to my questions---1) since installation, with timing set
> per the
> > manual, 16 degrees BTDC @ 1500 rpm, the engine won't idle. It just
> > stalls. It runs OK, given enough throttle, but why should it
> now not
> > want to run at the idle setting at which it was quite happy
> > 2) now the tach needle swings, about 200 rpm +/- at 2500 rpm,
> 300 rpm
> > +/- at 3000 rpm.
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