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02-27-2012, 08:20 PM
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#1 |
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Registered User
Join Date: Dec 2011
Location: mount airy NC
Posts: 308
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Help. Please
ok i just got my truck back from the shop from them tuning the carb replacing fuel filter and thermostat and now when you hit the gas from idle it has a delay which is worse now than it was. its better on gas but has a huge throttle delay. i dont know whats wrong with it but this truck has given me more trouble than its worth.
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77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator. |
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02-27-2012, 09:02 PM
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#2 |
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Registered User
Join Date: Nov 2011
Location: TEXAS
Posts: 179
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Re: Help. Please
if you paid someone to make it right, then you need to take it back to them and have them fix it.
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84 GMCummins 91 CCSB Dually american squarebody association |
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02-27-2012, 09:13 PM
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#3 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Help. Please
Sounds like you were running rich before and the guy tuned it. Once he leaned it out it caused your stumble to get worse. The reason you have an off idle stumble is the air fuel ratio lean out when the throttle opens. So you need a shot of gas to compensate such as the accelerator pump. Sounds like your accelerator pump needs to be tuned to compensate better. If it doesn't fix the issue then some more tuning needs to be done to the transition circuit
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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02-27-2012, 09:21 PM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Help. Please
Can't fix if we don't know the type of carb or setup.
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02-27-2012, 09:48 PM
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#5 | |
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Square
Join Date: Feb 2011
Location: Phoenix Arizona
Posts: 1,568
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Re: Help. Please
Quote:
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Squarebody Syndicate |
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02-27-2012, 09:49 PM
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#6 |
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Registered User
 Join Date: Oct 2011
Location: Wildomar, CA
Posts: 466
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Re: Help. Please
250 inline 6 with a monojet carb? Sounds like the accelerator pump is done....
Pickup an overhaul kit (comes with an accelerator pump) and overhaul the carb. Should cost you about 35 bucks....easy job. That is..........if the shop doesn't stand behind their work. Get with them first since you already shelled out some cash to them. If they're a reputable place, they'll make it right. Got 256,000 original miles on my '78 250. Great 'ol engines.... Last edited by beamn7; 02-27-2012 at 10:21 PM. |
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02-27-2012, 10:14 PM
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#7 |
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Registered User
Join Date: Dec 2010
Location: Alberta
Posts: 165
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Re: Help. Please
Like previously stated, if you brought it to them for a carb tune up and it has not fixed the hesitation, then bring it back. Honestly if it was in the shop where I work it, it would have never left it it hesitated on accel from idle like that. Sounds like the accelerator pump is either on the wrong setting, or is pooched.
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