| Re: [GMCnet] Primary venturis fuel drip at idle... and now HEI distributor issue? [message #333751] |
Wed, 20 June 2018 13:30  |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
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Senior Member |
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Today's findings...
Fred, you were spot on with the worn bore at the throttle shaft.
There's a noticeable bit of play. The single return spring is also way
too weak to serve any purpose, and the throttle cable stud is some
homemade deal involving a fuel line fitting and a bolt, so a whole lot
of wrong going on. I'll button it up as best as possible for the time
being, but it would need the bores sleeved at the least, if not rebuilt
or replaced with EFI.
But I don't think that's the only issue. I pulled the cap and rotor and
changed those, and tried a test on the advance/rotor arm assembly. I am
able to twist it from side to side as if under advance, but it takes a
good amount of force. Also, when released the shaft only returns half
way. I put a little movie of it up at
http://forwardlook.net/images/gmc/img_3913.mov I am guessing I will
need to pull it, strip out the shaft and give it a good cleaning, if not
a total R&R. Has anyone had the shaft 'stick' like that on an HEI
before?
-Dave
1978 Transmode near Pittsburgh
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Dave
Stragand
Sent: Wednesday, June 20, 2018 10:31 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Primary venturis fuel drip at idle
Thanks to all for the responses. I'll be stopping by today at lunch to
do some checks.
Fred -- I will check the throttle shaft bore by spraying carb cleaner on
the outside base at the shafts while it's running. Thanks for the
reminder as I have run into that before.
I'm leaning towards Bill's suggestion of a timing issue being the cause.
I recall that the rotor shaft was pretty sticky when twisting the rotor,
so I don't fully trust that all is well there. I have a new cap and
rotor so will check the shaft, vacuum advance and advance weights while
I'm in there.
Sammy -- I have had great luck with the Edelbrock (and Carter AFB's)
over the years, but if I was going to change, I would probably lean
towards Gerald's suggestion of EFI. The difference in price would be
well worth it. This is the first time I dragged out a timing light
instead of a laptop to tune a car in many years. It's nice to just turn
the key and go.
While very tempting to pour out upgrade money from the start, I am
holding off on the upgrades until we are sure she has enough 'good
bones' to continue moving forward. At present, the most I have driven
is about 20' backwards and forward -- but when she passes my wife's
"try driving it for 2 hours around the storage facility to make sure
it's in okay shape" test, my wallet will open a bit.
I will keep everyone posted with our progress!
-Dave
1978 Transmode near Pittsburgh
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1978 Transmode (403)
Pittsburgh, PA
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