-----Original Message-----
From: Mark Dawson [mailto:torchbone@yahoo.com]
Sent: Friday, 07 December, 2001 11:28
To: dersk@usa.net
Subject: Engine dies : 1978 MGB
Hi there,
Currently having a problem with the engine sputtering
and dying while driving along - very inconvenient. So
here's the setup: desmogged 78 B, Weber downdraft
carb, new fuel pump, clean fuel filter, new K&N
airfilter.
Checked distributor cap, rotor, wires, plugs, all ok.
Not sure how to check mixture on the Weber, but the
plugs are not fouled and exhaust does not smell
terrible. Checked the timing, it was advanced about
3/4 of an inch beyond timing marks. (?!) Adjusted it
to 10 degrees BTDC, as per sticker under the bonnet.
Idle set at 1000 RPM. This does not, however, affect
the problem of dying.
So what happens: the car will occasionally sputter and
die while sitting at a light. This behaviour seems to
get worse as the car warms up (coil? vapor lock?)
If you push the gas pedal in when it starts to
sputter, it will die completely. If you pump it a
little it may catch and keep on running. If you keep
it idling at ~1500-2000RPM it will continue running.
If it dies, it acts like it's dieseling, then there is
a terrible whirring sound coming from the Weber, then
a puff of smoke as it dies. I'm not at all sure what
would cause the whirring sound, but it doesn't sound
pleasant.
Any clues as to what to look for? Also, is there a
good reason why a mechanic had set the timing so far
advanced? (Note, changing the timing did not alter
this behaviour one way or the other.)
Thanks bunches!
-Derek Vandivere
=====
Mark Dawson
Manager, The Roundtown Cafe
234 N. Court St., Circleville, Ohio, USA
http://www.bones.org/torch/
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http://greetings.yahoo.com
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