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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Chisholmcody on August 12, 2014, 11:48:59 pm

Title: Carb trouble
Post by: Chisholmcody on August 12, 2014, 11:48:59 pm

Hello I have a 1978 chevy cheyenne with a rochester monojet and it seems to be having troubles when I'm driving with the motor cold and sometimes it happens when it's warm too. The issue is it seems to stutter very badly when you press on the throttle I adjusted the idle and got the solenoid to work and I have a idle of 850 out of gear and 500 ish in gear and I have yet to adjust the mixture on the fuel due to not having a vacume gauge. Could this be the issue ? Thanks for any help in advance!


Or could I just not be letting it warm up enough? It warms up for about 2,min and had a automatic choke

Title: Re: Carb trouble
Post by: jaredts on August 13, 2014, 03:20:36 pm

Do you get a strong squirt from the accelerator pump?

Title: Re: Carb trouble
Post by: Chisholmcody on August 13, 2014, 06:00:46 pm

I don't know but I talked to the guy on my street and he said the float level could be to high is this true?

Title: Re: Carb trouble
Post by: bd on August 13, 2014, 06:33:09 pm

Remove the air cleaner.  With the ignition and engine OFF, look down the throat of the carburetor with a flashlight and operate the throttle by hand.  Does a steady stream of fuel squirt into the center of the bore every time you open the throttle?  You should be able to do this about four times before you drain the carburetor of fuel.

Title: Re: Carb trouble
Post by: Chisholmcody on August 13, 2014, 08:07:05 pm

I will try that tomorrow after school and work hopefully if I have time

Title: Re: Carb trouble
Post by: emod20 on August 14, 2014, 04:30:11 pm

one thing to check, i think that has HEI distributor with vacuum advance? if it does what happens sometimes is there is 2 wires in dist that go from the pickup coil to the module. every time the vacuum advance moves it wiggles those wires. then they start to break. and when you use throttle and the advance moves they loose contact and cause a bad stumble. i would unhook the vacuum advance line and plug it and try driving just to see. or you can pull cap and tug on the wires. they always crack right where they go into pickup coil. but keep in mind if that is problem they will a lot of time break completly when you touch them, then its dead. just one idea to check.

Title: Re: Carb trouble
Post by: Chisholmcody on August 16, 2014, 01:15:11 am

Also is there a reason for my fast idle to not be working now? It was working around a week ago

Title: Re: Carb trouble
Post by: rich weyand on August 16, 2014, 02:50:07 pm

Quote from: Chisholmcody on August 16, 2014, 01:15:11 am

Also is there a reason for my fast idle to not be working now? It was working around a week ago

Sounds like the choke isn't working.