425 carb question

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Old Oct 2, 2019 | 10:34 AM
  #1  
GCH's Avatar
GCH
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From: Arvika,Sweden
425 carb question

Hi when i,m driving my 98 in city ( low speed ) and take sharp turns the car "hesitates" a little.
Have not noticed this straight forward.

The carb should been serviced in US before it shipped to Sweden last year.

Could this be low float level ? Have some issues now also when starting the engine,
seems like the engine get to much gas on idle and runs bad / flood gas.

Replaced the carb on my 88 to a rebuild Autoline carb and this runs good, was thinking to
order one Autoline to my 98 also or is a Edelbrock a better way to go ??

Old Oct 2, 2019 | 12:49 PM
  #2  
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From: Poteau, Ok
Looks like your carb needs a service by the pictures, its leaking fuel and probably leaking vacuum. Your air cleaner won't fit the edelbrock and your linkages will need modified, your also looking at an electric choke conversion.
Old Oct 2, 2019 | 03:45 PM
  #3  
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From: S.E. Louisiana, so far still in U.S.A.
I would stay with the Rochester, just try to get one that's adjusted properly and functioning correctly.
Old Oct 6, 2019 | 11:17 AM
  #4  
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GCH
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From: Arvika,Sweden
Hi, i just ordered a rebuilt Autoline C 979 from Rockauto . Hopefully just bolt on.
Have an Edelbrock on my GMC truck that have worked very good but want to
use the original aircleaner and linkages.

Two of my friends ordered carburators from jandjcarburators and both this carburators
did not work at all so they should return them.
( Impala -64 and Belair -64 both with 283 engines )
Old Oct 14, 2019 | 09:00 AM
  #5  
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GCH
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From: Arvika,Sweden
Hi today the rebuild carburator arrived


Old Oct 14, 2019 | 09:22 AM
  #6  
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Looks pretty enough.
Old Oct 20, 2019 | 11:56 AM
  #7  
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GCH
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From: Arvika,Sweden
Hi would be nice if somebody could write
what the adjusting screw under the choke
housing is for.

I looked in the chassies manual and the screw was called
"fast idle screw" so i suppose this is idle rpm when choke
is working.

Last edited by GCH; Oct 21, 2019 at 10:32 AM.
Old Oct 22, 2019 | 05:35 PM
  #8  
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From: Central Illinois
I'm not familiar with that particular carb but yeah, the fast idle screw adjusts how fast the engine idles when cold. I have mine set at about 1200 rpm fast idle. Your manual should specify.
For what it's worth, my carb recently started dying when I stopped too fast and hesitated on turns. Brand new carb, too. Turned out the air horn gasket went bad and it was sloshing fuel into the venturis and flooding out. New gasket solved it.
Old Oct 23, 2019 | 11:02 AM
  #9  
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GCH
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From: Arvika,Sweden
Thanks for answer, took a 45 mile drive in the evening and no hesitasion so that´s good.
Should check the fast idle rpm screw more when cold start.
Thanks for tip about your carburator
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