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03-05-2018, 09:53 AM
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#1 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,388
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Engine "lopes" after startup
I have a question about why my engine lopes about 5-10 seconds after startup? It is bad enough that I have to hold my foot on the gas pedal to keep it from dying. Once it has run for a few minutes, it smooths out. I know my carb is running rich. Could that be the problem?
Engine:283 Trans:TH350 Carb: Carter 500 with electric choke |
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03-05-2018, 10:18 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,775
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Re: Engine "lopes" after startup
when is your carb running rich? At idle or at cruise?
What’s your idle rpm? How far open is the choke door just after you start it? |
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03-05-2018, 01:56 PM
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#3 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,388
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Re: Engine "lopes" after startup
It seems rich all the time. Whenever I punch it, I'm getting a bunch of black smoke mostly out of the left side but both pipes are black on the outside.RPM's are about 700. Not sure on how open the choke is
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03-05-2018, 02:21 PM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,775
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Re: Engine "lopes" after startup
That means you’re flooding likely due to too much fuel pressure or high floats.
Check your floats and lower them 1/8 inch from normal. If that don’t help you’ll need a fuel regulator. Your carb doesn’t like more than 5 psi. Your choke plate should open about 1/4 inch or slightly more right after it starts up. With a rich carb you might need to open it more. Pull the air cleaner lid off and watch what it does on start up. |
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03-05-2018, 02:31 PM
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#5 |
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1962 C-10
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
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Re: Engine "lopes" after startup
Your plugs are probably getting wet with fuel. Takes it a few minutes to burn them clean to smooth the engine out after start up.
x2 on the pressure regulator. Run one on mine. What a difference!
__________________
Joseph Chavez  "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4 |
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03-05-2018, 08:08 PM
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#6 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,388
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Re: Engine "lopes" after startup
Thanks guys. I have a pressure regulator. I will put it back on and see if it takes care of the problem.
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03-05-2018, 11:25 PM
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#7 |
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Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,795
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Re: Engine "lopes" after startup
Btw, running stinking, sooty rich is bad for the valve guides.
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03-07-2018, 03:03 PM
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#8 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,388
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Re: Engine "lopes" after startup
Ok, got my regulator on but have question. Is the vacuum port right in front of the fuel inlet line supposed to be capped or open? I can't get the picture to upload
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03-07-2018, 03:09 PM
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#9 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,775
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Re: Engine "lopes" after startup
Always capped
Any port that nots being used needs to be sealed.. |
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03-07-2018, 04:58 PM
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#10 |
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Registered User
Join Date: Feb 2013
Location: Cottonwood, Arizona
Posts: 1,388
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Re: Engine "lopes" after startup
Thanks Geezer. I will cap it
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