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  #1  
Old 05-02-2013, 02:11 AM
Pacheco911 Pacheco911 is offline
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Default Carb issue? Idk

Truck starts pretty good, idles fine but when i give it hard gas (at idle) itll backfire through the carb or if i slowly give it gas till 4500-5000 rpm and let off the gas quickly itll try to die. Doesnt seem to really be a problem because i just give it more gas. I was thinking accl pump? Suggestions? Thanks for the help!
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Old 05-02-2013, 09:35 AM
Warlock III Warlock III is offline
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It sounds like it could easily be the accl pump.

IMO thought vacuum leak could do it, carb base gasket, or vacuum advance (throwing the timing off just a touch).
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Old 05-02-2013, 05:38 PM
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brandonjansen brandonjansen is offline
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Yup, if it's popping back like that it's a vacuum leak. Accelerator pump would just make it slug-ish off the line, not pop back. Check your intake and carb gaskets.
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Old 05-03-2013, 02:05 AM
Pacheco911 Pacheco911 is offline
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If i punch it, it almost bogs down. Does that mean anything?
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Old 05-03-2013, 02:29 AM
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If it has a vacuum leak it could be leaning out.... But it could also be the accelerator pumps or float bowl level. I'd start with look for leaks and putting some new gaskets on. The see what happens. If it still bogs start fixing the carb up.
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Old 05-03-2013, 02:42 AM
Pacheco911 Pacheco911 is offline
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Sounds good, i think it has a 1/4 or 1/2 inch spacer/gasket on it. Iv read online puting a 1'' spacers helps alot. Yea?
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Old 05-03-2013, 02:43 AM
Pacheco911 Pacheco911 is offline
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btw the plugs looked pretty black when i took em out. But it seems to run lean. Idk
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Old 05-03-2013, 02:59 AM
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Quote:
Originally Posted by Pacheco911 View Post
Sounds good, i think it has a 1/4 or 1/2 inch spacer/gasket on it. Iv read online puting a 1'' spacers helps alot. Yea?
Ya a 1" spacer would probably help you out. It gives the air and gas more room to mix properly and reduces quenching in the intake.

But ya, if there is a spacer on it definitely check/replace all the gaskets.

Quote:
Originally Posted by Pacheco911 View Post
btw the plugs looked pretty black when i took em out. But it seems to run lean. Idk
If the plugs are old it hard to get a good reading off them. The best thing to do is put new plugs in it, go to a side road and put your foot to the floor for an approximate 1/4 mile run, pull to the side if the road right after and pull the plug to see how it looks. If it's black you're running to rich, if it's perfectly clean you're too lean. There should be a nice tan brown colour too it and a visible burn line. That's how you know you have the right mixture.
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