Hi Dean,
It sure sounds like some kind of a gremlin has invaded the idle circuit on
one or both of your carbs. The idle circuit not only controls fuel flow at
idle, it stays in play for at least the first 1/3 throttle opening before it
finally tapers off. So, water, dirt or almost anything in a passage way, jet
or mixture screw opening can cause this problem. You will probably have to
open the carbs and make sure everything is clear but you might just be able to
blow compressed air in the idle mixture screw holes and blow it out at least
temporarily.
If you filled the fuel tank just before this happened you might have
picked up some water.
Skip Patnode
'67 Duetto
Norfolk, Va
Date: Mon, 24 May 2010 0:22:59 +0000
From: <[email protected]>
Subject: [alfa] Idle and running problems - any idea what's going on?
I am wrestling with a running problem with my Super, and am now reaching out
to this forum for ideas.
The car is a 1976 Giulia Nuova Super 1300 with twin Solex ADDHE carburetors.
Up until yesterday, it was cold to start, but ran like a champ when warm.
Yesterday, the following symptoms appeared:
- - Engine won't hold an idle, even when fully warmed. I can only keep it
running by blipping the throttle or pulling out the enrichment knob.
Otherwise, it just slowly dies.
- - Engine misses erratically at part throttle cruising speeds. Acceleration
with full throttle is smooth, although it may be on the weak side.
Following the theory that 95% of all fuel problems are electrical, I checked
the plugs, points, rotor, etc. Everything appears to spec. Spark plug tips are
uniformly light tan, maybe even on the whitish side. I can't imagine what
other electrical component might be causing the problem.
I don't think its fuel supply because the problem is worst at idle and the car
accelerates OK. Nonetheless, I checked the fuel filter and cleaned the
element. No debris in the glass bowl and the filter is relatively clean. I
blew it out with compressed air, and am ordering a new one, just in case.
All of the above made no difference whatsoever.
Now I'm thinking its a vacuum leak. I checked the brake booster, and it's got
good vacuum in the line 15 minutes after the car is turned off.
What I am missing here? Cracked carb mounts? Something even more esoteric?
Help me!
Thanks.
Dean Mericas
Austin, TX
1974 2000 GTV / 1976 Nuova Super 1300 / 1965 TR4
--
to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi
or email "unsubscribe alfa" to [email protected]
