Jim
First step is to check if the accelerator linkage has hung up
somehow when it goes to high idle after warm up.
There are numerous reasons why the linkage may not be returning correctly.
I had the carpet catch the pedal lever once and I had a poor alignment of
the linkage another time. Just go through the whole system in case there is
a combination of problems if the linkage is the problem. Also make sure the
carb is off any high idle position.
2nd
There is a possibility that the distributor is not returning to the
base setting. The stock distributor on your 260 would be an early style
distributor and there are many wear points in the advance mechanism. An
early style distributor has an oil port and a round lower body. Casting #
B9AF-12131-B near the coil wire.
I worked on one early style distributor that was worn and it
sometimes returned to base timing sometimes not. It was variable where the
timing would return to and the idle speed was variable also. You can check
that with a timing light after the engine is warm and you just move the
throttle a few times while watching the base timing position.
3rd
A vacuum leak could cause this but I would think it would be more
constant. Always worth looking at vacuum lines for a cracks or splits just
in case.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of James Lindner
Sent: Tuesday, November 23, 2010 6:57 PM
To: tigers@autox.team.net
Subject: [Tigers] Inconsistent idling
Hi all,
I have recently noticed a distinct distance between the curb idle when I
first start my Mk1 and after driving for a bit. When I start the engine the
"fast" idle (1200 or so) engages and after warming up it correctly kicks
down to "curb" idle (900). After driving however the idle stays up around
12-1400 whenever I stop and put the car into neutral or engage the clutch.
My Mk1 has a pretty much stock 260 with a Holley 4bbl (465 cfm) Model 4160.
I was wondering if anybody else has had similar issues and what was their
diagnosis.
My first inclination is that this is more likely a problem with the
accelertor linkange as opposed to a carb problem. I only say that since the
engine idles correctly at curb (900) and fast (1200) idle levels early on
and it is only after pressing the gas pedal during driving does the higher
curb idle level occur.
Thanks,
Jim Lindner
B9470033
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