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September 29th, 2008

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Q & A: Anti Run On Valve

Thursday December 11th, 2008
Q & A, MGA, MGB, MGC, MG T-Type, Midget
The B was running fine when I drove to my friends house to have him help
me
install a Pertronix electronic ignition. When then decided to take the
distributor completely out and really give it a good cleaning. In the
process of removing the distributor we accidentally broke off the nipple
connection to the anti run-on valve. To be honest I am not certain the
electrical connections to the top of the anti-run on valve were connected
for many years so I was not too concerned that we had lost the nipple.
My
friend felt bad about breaking off the plastic nipple and he decided to
at
least correct the rather loose wires at the top. During this process of
getting good electrical connection he noted that the switch (noted in the
photograph at about 2:00) got extremely HOT so much so that he
disconnected
power to the switch (also in the photo).

My questions, which I am willing to call in if your would prefer, are:

1. What could be causing the valve switch to get so hot?

2. The anti run on valve is about $90.00 from Moss. Is this something
that
is really needed or just part of the 70s attempt to satisfy emissions
standards ? As I mentioned I really think the electrical connections were
not good before my recent activity.

3 The B now runs very rough, and is sluggish with frequent backfire
through
the carbs. Is this most likely a result form the Pertronix install, the
lack of connection to the Anti-run on valve, or possibly all or none with
other causes?

3.4 My next steps will be to isolate any vacuum leaks and the re-balance
the
carbs. Does the install of the Pertronix mandate a re-balance of the
carbs
in and of itself ? Do I need to wait until after I receive and install
the
new anti run-on equipment before doing the carb balance?
The anti run on valve wiring is HOT only when the key is OFF --
unless the two in-line fuses beneath the fusebox have been connected
crisr-cross (slate with brown / brown with slate). The switch is grounded
ONLY when you ... read more