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08-25-2010, 02:33 PM
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#1 |
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Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
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Truck Stalls When I Step on the Gas
Arrgh.
I've got a '69 GMC with an 250/3 speed manual. It starts well and idles well. BUT, when I step on the gas to let out the clutch, it stalls. I have to nurse the accelerator to higher RPMS by slowly applying pressure to the pedal. After its rolling it runs pretty well and runs reasonably well on the highway. What am I missing?
__________________
Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. |
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08-25-2010, 03:03 PM
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#2 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Truck Stalls When I Step on the Gas
Things to check:
First remove the breather and check to see if the accelerator pump/plunger squirts gas into the carb. If it does then check for vacuum leaks. Mine had a gasket leak on the bottom. Take the cap off the dist. and disconnect the tube to the vacuum advance. Suck on the end of the hose to see if the vacuum advance moves freely. Check your points if you have them for proper gap and the timing. Also, you may want to get a kit for the carb. They're easy to take apart and give it a good cleaning. Readjust the idle air screw for maximum vacuum at idle. |
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08-25-2010, 06:52 PM
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#3 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,774
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Re: Truck Stalls When I Step on the Gas
-
My money is on the accelerator pump not working... LockDoc
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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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08-25-2010, 07:13 PM
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#4 |
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Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Truck Stalls When I Step on the Gas
x3 on the accel pump
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68 3/4 ton  (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged  build thread41 3/4 ton (wife's)-flatbed, fully restored to original01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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08-25-2010, 08:57 PM
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#5 |
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sharp as a marble
Join Date: Jan 2007
Location: atlantic beach,florida
Posts: 1,082
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Re: Truck Stalls When I Step on the Gas
Before you condemn the carb, make sure that you have checked to see that the point gap is correct?
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08-26-2010, 10:07 PM
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#6 |
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Registered User
Join Date: Jun 2009
Location: Arlington Texas
Posts: 602
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Re: Truck Stalls When I Step on the Gas
plug wires too. check em.
__________________
1970 GMC truck 1988 Harley 1200 Sportster 
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