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12-18-2014, 09:41 PM
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#1 |
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Registered User
Join Date: Oct 2014
Location: Savannah, GA
Posts: 82
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Choking Out
Today as I headed down the highway I stepped on the gas into the passing lane and got several repeated hesitations. Felt as if it was loosing fuel or spark. Came off the gas back into the slower lane, truck ran fine the remaining way home?New to the truck, 350 all stock. Point me in the best. Thanks!
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1972 GMC 2500 2007 Chevrolet Silverado 1500 |
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12-18-2014, 09:43 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: Choking Out
Fuel pump was talkin' to ya!!
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12-18-2014, 11:47 PM
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#3 |
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Senior Member
 
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,852
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Re: Choking Out
Could also be fuel filter getting plugged up.
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12-19-2014, 11:18 AM
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#4 |
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Registered User
Join Date: May 2011
Location: Fort Pierce, FL
Posts: 430
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Re: Choking Out
Will it accelerate if you do it slowly slowly? A bad or leaking accelerator pump can also do that, because it leans out the mixture when you step on it.
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12-20-2014, 12:03 AM
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#5 |
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Registered User
Join Date: Oct 2014
Location: Savannah, GA
Posts: 82
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Re: Choking Out
Only happens at highway speeds. I can step on it from a stop and she will go (unless cold). When I let off and then step conservatively she will go just fine.
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1972 GMC 2500 2007 Chevrolet Silverado 1500 |
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12-20-2014, 07:52 AM
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#6 |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: Choking Out
Good start ( and easiest) would be fuel filter... Check the air filter too..
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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01-21-2015, 05:40 PM
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#7 |
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Registered User
Join Date: Oct 2014
Location: Savannah, GA
Posts: 82
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Re: Choking Out
Well, replaced the fuel filter and air filter and the issue came back today but worse. I don't drive the truck daily, recently purchased, drove fine for several weeks, pump was replaced less tan a year ago. Today I hit the highway and she started choking out when I hit 55mph, must slow to around 35 before she would accept the gas pedal without surging, after the first issue she got worse by starting the choking/surging around 35mph, cut out once when I pushed to the floor to see if she would push through it. Limped home around 30 mph without issue. Idles fine, get a slight hesitation from a stop. Stumped here? Hope a smarter person can assist.
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1972 GMC 2500 2007 Chevrolet Silverado 1500 |
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01-21-2015, 05:53 PM
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#8 |
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Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Choking Out
Points or HEI dozzy? I fought the same issue with my old points ingition system. Converted it to HEI and the issues went away.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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01-21-2015, 08:16 PM
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#9 | |
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Registered User
Join Date: Jul 2012
Location: Anderson,SC
Posts: 953
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Re: Choking Out
Quote:
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01-21-2015, 09:24 PM
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#10 |
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Registered User
Join Date: Oct 2014
Location: Savannah, GA
Posts: 82
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Re: Choking Out
Did you do a full HEI conversion or just a points eliminator kit? What system would you recommend? Also do you need to change the gap of the spark plugs?
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1972 GMC 2500 2007 Chevrolet Silverado 1500 |
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01-21-2015, 09:56 PM
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#11 | |
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Registered User
Join Date: Jul 2012
Location: Anderson,SC
Posts: 953
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Re: Choking Out
Quote:
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01-21-2015, 10:38 PM
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#12 |
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Registered User
Join Date: Apr 2014
Location: Bonney Lake
Posts: 101
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Re: Choking Out
Bad plug wire? Bad plug? improperly run/crossed up plug wires? Worth a look
  EDIT: I've got a full HEI that I monkeyed with with that crane cams HEI recurve kit with plugs at .045. Runs so nicely now |
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01-22-2015, 10:15 PM
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#13 |
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Registered User
Join Date: Oct 2014
Location: Savannah, GA
Posts: 82
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Re: Choking Out
Along with checking/replacing the points, wires, rotor, etc. I am thinking about replacing/overhauling the carburetor. Anyone use National Carburetor or a easy rebuild kits? Two things scare me: transmissions and carburetors.
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1972 GMC 2500 2007 Chevrolet Silverado 1500 |
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01-22-2015, 10:30 PM
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#14 |
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Registered User
Join Date: Apr 2014
Location: Bonney Lake
Posts: 101
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Re: Choking Out
Oh rebuilding a carb is easy! All you have to do is get a nice clean table and lay everything out in the order you take them off, clean out the bowls and whatnot, check float level, replace all gaskets and the acc. pump plunger and put her all back together! It's really easy. I'd never done one before I did mine and it was way simpler than I ever would have thought before I did it. What kind of carb is it?
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