Actually the MGB sometimes has a bit of a (I think?) unique run on problem.
The ignition switch does not shut of power to the coil when you turn the car
off. It removes power to a relay. What was happening with my car was...turn
the car off and it would still run. What was happening was the alternator
still had enough momentem
to keep the relay energized. Cure....slam the right door really hard!
Or what worked better was putting a diode in line with the wire from the
alternator that goes to the warning light on the dash. It's really nice
having my car shut off now. Oh yeah, some cars came from the factory with
this diode.
-----Original Message-----
From: Tyson Sherman <tsherman@tecinfo.com>
To: Rene and Marion van Maanen <renevm@support.neth.hp.com>; MG mailing list
<mgs@autox.team.net>
Date: Friday, March 27, 1998 5:20 PM
Subject: Re: Anti run on mech MGB
>Rene,
>
>Running on isn't really due to ignition...I think it's due to compression,
>heat, and fuel/air supply. They keep the engine spinning after the car
>shuts off.
>
>On my 76, the anti-run on valve doesn't click until the oil pressure drops
>to zero, which sometimes is when I'm out of the car and to the door to my
>house. It doesn't apply the vacuum until the valve clicks. You can test
>it by the procedure in the Haynes manual.
>
>I think over-advanced ignition timing and lean fuel/air mixtures can also
>cause running-on.
>
>Rene and Marion van Maanen wrote:
>
>> Scott and Art,
>>
>> It looks like I have a problem here. The engine of my B DOES run on
>> after power down. Only when it is hot. But how is this possible with no
>> power to the coils? Do I still have a spark there?
>>
>> Rene
>
>--
>Tyson Sherman
>http://www.tecinfo.com/~tsherman
>
>
>
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