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Re: Zero Idle

To: Wetmgs <>
Subject: Re: Zero Idle
From: Jim Carlile <>
Date: Mon, 20 Apr 1998 18:34:23 -0700 (PDT)

---Wetmgs <> wrote:

> What in the carbs will cause sudden rich mixture? 
> Any ideas, anyone.  74B HIF4's
> Marc Derenzy,
> Bremerton, WA


How many miles on the carbs? My 74 HIF's had a microscopic pinhole
leak in one of the floats. Caused a similar problem until one day
complete flooding developed when trying to start-- ruined the carbon
cannister. If the floats are the originals, check it out. 

Mechanic told me at the time it was a common fault during that era--
As the float slowly fills up with gas it stops floating, leading to
all sorts of fun.

Could be a lot of other reasons for sudden enrichment- The HIF's are
more complicated than previous SU's.  I had the same problem
subsequently, too, but always found it would go away after repeated
starts. Sometimes the linkage sticks, especially after repeated stop
and go, or a bit of crap from the tank gets sucked in. The best
solution is a complete rebuild to make sure they're set up right.
Also, how's your fuel pump? Low RPMs bring out pump problems.

'74 B

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