AFAIK the 45DM (and 45DE) aren't 'proper' electronic ignition systems, only
an electronic trigger to the standard ignition system, much like the
Pertronix, i.e. it only replaces the points.
PaulH.
----- Original Message -----
From: Garner, Joseph P. <JPGarner@UCDavis.Edu>
To: <paul.hunt1@virgin.net>; <wtsnyder@juno.com>; <mgs@autox.team.net>
Sent: Wednesday, February 28, 2001 6:44 PM
Subject: RE: Engine Running Rough
> isn't pulling the leads from the plugs meant to fry an electronic
ignition?
>
> ___________________________
>
> Dr. Joseph Garner
> University of California
> Department of Animal Science
> One Shields Avenue
> Davis
> CA 95616
> USA
>
> Phone: (530) 752 1253
>
>
>
> > -----Original Message-----
> > From: paul.hunt1@virgin.net [mailto:paul.hunt1@virgin.net]
> > Sent: Wednesday, February 28, 2001 6:55 AM
> > To: wtsnyder@juno.com; mgs@autox.team.net
> > Subject: Re: Engine Running Rough
> >
> >
> > No 1 plug may not be firing. Clip your timing light onto
> > each plug in turn
> > and check that it flashes. Alternatively remove the lead
> > from each plug in
> > turn and connect it to a spare plug which you lay on the
> > block - check that
> > all spark. Could still be a bad plug, though, 'cept you have replaced
> > yours. Another way is to remove each plug lead in turn (if
> > you do this with
> > the engine running watch out for shocks) and listen to how the engine
> > responds. If the rough running gets even worse on three of
> > the cylinders
> > but remains the same on the fourth, than that cylinder is not
> > firing for
> > whatever reason. Then you have to determine why.
> >
> > PaulH.
> >
> > ----- Original Message -----
> > From: <wtsnyder@juno.com>
> > To: <mgs@autox.team.net>
> > Sent: Wednesday, February 28, 2001 1:52 PM
> > Subject: Engine Running Rough
> >
> >
> > > Hello list. I'm back to a problem I've been ignoring to
> > work on other
> > > things for the past month. I purchased a '72 BGT with a
> > later 1979 18GV
> > > engine. It was running very well at the time of purchase
> > except for a
> > > very loud aftermarket fuel pump (the little box type). After a short
> > > jaunt to town and back, I was climbing the last hill in my
> > driveway when
> > > the engine began acutely running very rough. Plug #1 one
> > seemed to be gas
> > > fouled. This engine is fitted with aftermarket sidedraft
> > Mikuni carbs and
> > > has the 1975-1980 45DM distributor with electronic ignition
> > (amplifier
> > > box mounted on passenger fender well under coil).
> > >
> > > Since the initial episode, I have:
> > > 1) Replaced the dizzy cap (it appeared to have a hairline crack near
> > > where the #1 plug wire attached).
> > > 2) Replaced the plug wires.
> > > 3) Gapped and fitted new plugs.
> > > 4) Replaced a leaking fuel tank.
> > > 5) Replaced the fuel pump. (Special thanks to Barney Gaylord for his
> > > advice and tech article on aftermarket low cost fuel pumps and their
> > > fitting!)
> > > 6) Rebuilt rear brake cylinders.
> > >
> > > Yesterday, I put petrol in the tank and cranked the engine.
> > It still runs
> > > just like it did before the work.
> > > Any advice on where to go from here? I have a timing
> > strobe, but I am a
> > > neophyte in its use. Could the timing chain have slipped a link and
> > > thrown the timing way off?
> > > Everyone's input and advice is appreciated as always.
> > > Bill Snyder
> > > '66 MGB
> > > '72 BGT
> > > PS I was able to purchase the '72 BGT parts car with LH
> > type OD tranny
> > > for $200. I plan to eventually fit that tranny on this
> > problem GT if I
> > > can get her running well.
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