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#1 |
Registered User
Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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So I have a 74 250 6 cylinder in my C15.the thing would barely run when I got it did compression check (130-150 psi ). Rebuilt the carb, fuel filters, complete tune up plugs ,wires, cap & rotor, points and condenser.etc. checked for vacuum leaks etc. Still have a hesitation if you try to take off or rev it sitting in the drive.
It idles with the idle stop screw backed all the way out,. But the idle mixture screw is out more than I feel it should be probably 4 turns. Anyone have any suggestions? Also looking for the thread size of the idle solenoid as I would like to replace it with a bolt.or screw. |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
Turn the mix screw in a bit at a time until it stumbles.
What did you set the initial timing at? |
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#3 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
How much vacuum do you have at idle?
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#5 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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#6 |
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,545
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Re: monojet ?
Do you have an idle tach? The vacuum seems good.
Does the monojet have an acceleration pump or equivalent? Hesitation on acceleration is often an issue with not enough extra gas being added as the throttles are opened. |
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#7 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
Could be flooding a bit or have a dripping booster.
Look in the carb while idling. Look for any excess fuel. Should be none. |
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#8 |
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Join Date: Jan 2013
Location: Eastern TN
Posts: 1,921
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Re: monojet ?
If it has sat a bunch I am betting on an a bad accelerator pump.
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#9 | |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
Quote:
I'm going to try screwing in the solenoid and trying to adjust the idle again see if maybe there's something with that. |
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#10 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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#11 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
How extensive was the carb rebuild?
Did you tear it apart completely or just a cleaning and gaskets and float adjustment? |
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#13 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
I tore it down soaked it and installed a rebuild kit..
This is what it looked like when I opened it up. |
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#14 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
Did you remove the throttle plate and check the throttle shaft?
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#15 |
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Join Date: Jun 2022
Location: Battle Creek Mi
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Re: monojet ?
Yes soaked that's as well.
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#16 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
Just so’s we’re on the same page!
You did remove the throttle plate and remove the throttle shaft from the carb. Is that correct? |
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#17 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
No I didn't pull the shaft from the throttle plate. Just soaked and cleaned the assembly together after removing it from the carburetor bowl.
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#18 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
Good.
Have you checked the vac pot on the distributor is good? |
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#19 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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#20 |
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Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: monojet ?
Be sure the float level & metering rod are adjusted to specs.
With the engine off, look down the throat of the carb & open the throttle. You should see a stream of gas going into the throat. George |
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#21 |
Registered User
Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
I did this the other day and it appears to be spraying and no hesitation in the spray as soon as I move the throttle it's spraying.
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#22 |
Registered User
Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
Ok so tonight I went out and rechecked some things, sped the idle up a little and readjusted the carb was a little better..
So then I was checking again for vacuum leaks and noticed the dash pot isn't holding, so I plugged that line off. I also had my vacuum advance hooked to full vacuum at idle.. changed that to ported. Seems better but probably should re adjust the carb again since I changed the advance on the timing. My other question is if I do have the metering rod too low would this affect the take off hesitation? |
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#23 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: monojet ?
[QUOTe
My other question is if I do have the metering rod too low would this affect the take off hesitation?[/QUOTE] Definitely. You may have to readjust the idle speed when you changed from full vacuum to ported. Make Shure the gasket between the throttle body & float bowl is the correct one & installed correctly. 2 gaskets come with the kit & it is easy to install it wrong. George |
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#24 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,608
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Re: monojet ?
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#25 |
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Join Date: Jun 2022
Location: Battle Creek Mi
Posts: 66
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Re: monojet ?
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Tags |
hesitation, monojet |
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