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09-25-2016, 04:57 PM
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#1 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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69 chevy with 250 ?
Just got the truck runs ok at high speed but at low speed really have to keep foot on gas to keep it going , any ideas on how to fix this ?
Plugs are new points new cap new help please |
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09-25-2016, 05:04 PM
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#2 |
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Senior Member
 
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: 69 chevy with 250 ?
There could be a dozen reasons , Have you tried to adjust the idle screw on the carb ? ? Are you familiar with these old trucks ?
__________________
 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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09-25-2016, 05:09 PM
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#3 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Im familar with the trucks just not a 250 . I tried to adjust the idle screw but did not help . I was thinking might need a carb rebuild . It was from a high elevation and im at close to sea level not sure if that would make a big difference . Looking to get a manual now
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09-25-2016, 05:40 PM
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#4 |
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Registered User
Join Date: Aug 2016
Location: North Sask, Canada
Posts: 84
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Re: 69 chevy with 250 ?
i have the haynes book, is it stock carb?
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09-25-2016, 06:00 PM
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#5 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Yes it is the stock monojet
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09-25-2016, 06:09 PM
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#6 |
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Registered User
Join Date: Aug 2016
Location: North Sask, Canada
Posts: 84
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Re: 69 chevy with 250 ?
Does it idle well after start but die after you throttle? could be too strong throttle spring.
with truck idling back what you think is idle screw all way in it should then idle crazy high. ill look in my book to see what carb # it is. from there you can look up manual. in my book its rochester "mv" http://www.carburetor-parts.com/Roch...al_ep_352.html idle speed spec is 480-500 Last edited by Jarvis-69 GMC 1500CK; 09-25-2016 at 06:18 PM. |
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09-25-2016, 06:13 PM
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#7 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
It will start fine then when i put foot on gas it dies out and then once im moving faster is ok
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09-25-2016, 06:19 PM
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#8 |
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Registered User
Join Date: Aug 2016
Location: North Sask, Canada
Posts: 84
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Re: 69 chevy with 250 ?
in my book its rochester "mv"
http://www.carburetor-parts.com/Roch...al_ep_352.html idle speed spec is 480-500 |
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09-25-2016, 06:22 PM
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#9 | |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: 69 chevy with 250 ?
Quote:
That sounds like the accelerator pump is not working. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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09-25-2016, 06:23 PM
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#10 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Thanks mine is earlier then that ill look for a manual later
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09-25-2016, 06:24 PM
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#11 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Lockdoc acc pump on carb?
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09-25-2016, 06:28 PM
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#12 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: 69 chevy with 250 ?
Quote:
LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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09-25-2016, 06:44 PM
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#13 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
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Re: 69 chevy with 250 ?
Sounds like too much air from a vacuum leak!
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09-25-2016, 06:56 PM
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#14 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Ok good a couple things i can check
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09-25-2016, 06:57 PM
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#15 |
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Registered User
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Re: 69 chevy with 250 ?
Use some propane to check for vacuum leaks. And rebuild the carburetor. Mine had a similar issue and it had a couple vacuum leaks. One around the intake manifold and the other at the base of the carburetor.
I ordered my rebuild kit from mikes carburetor and they have been really helpful. I like the brass float the kit came with. |
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09-25-2016, 07:46 PM
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#16 |
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Registered User
Join Date: May 2012
Location: thousand oaks,ca.
Posts: 35
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Re: 69 chevy with 250 ?
Well it was a vacuum found a bad rubber cap on one of the nipples replaced it good to go
Thanks for the help |
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