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04-19-2009, 02:32 PM
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#1 |
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Registered User
Join Date: Jul 2006
Location: manitoba canada
Posts: 18
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250 help
i put a 250 in my truck from a chevelle , now it coughs and sputters , any suggestions on what to look for , runs ok at higher rpms , but if running low rpm's it coughs and sputters bad
mike |
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04-19-2009, 03:25 PM
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#2 |
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Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
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Re: 250 help
Sounds like you need to re-build the carb. I'd check the timing too.
__________________
-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS  -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too)  You've gotta be able to stop and steer before you can go fast! |
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04-19-2009, 06:33 PM
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#3 |
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Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: 250 help
Same thing happened to me a while back but on a newer foreign engine. Spit and sputtered at low RPM, ran fine higher RPM. Turned out to be a vacuum leak.
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-Scott- |
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04-19-2009, 07:13 PM
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#4 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: 250 help
Check for vacuum leak as stated.Check to see if your accelerator pump is squirting fuel.Also check plugs.The carb may be at fault but I rebuilt mine and it was not much better.I put in an HEI.Mine is about20-30 HP better with it.I paid $25 at the JY for it.There is a great write up in the FAQ's by member 'shifty" on install,including part#'s for the wiring connector.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 04-19-2009 at 07:17 PM. |
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04-19-2009, 08:18 PM
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#5 | |
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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: 250 help
Quote:
If it ran good before and now it doesn't, and you check the areas that have been mentioned, it could be bad gas in your tank. I ran a small 1 gallon tank with a hose to the intake side of the fuel pump when mine was doing the same thing. It turned out to be bad gas. Of course, lots of things can cause this problem... If you didn't check it out before hand it could be bad valves, bad cam, spark plugs, wires, distributor, etc... Lot of things to check, but I'd start with the simplest things first. |
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