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Old 06-18-2012, 10:35 AM   #1
cropro27
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Default Carb Sputtering issue

I am sorry for reposting something that might have been talked about before. But there is just so much stuff to go through. Anyway here is my setup. I have a 1976 IH terra with a 304 v8 2bbl carb. Here's my problem. My dads friend convinced my Dad to replace my original carb with a remanufactured one from kragen's. Everything was working fine, but after a few weeks the truck started to sputter. It worked fine cold but when it wormed up thats when it would start to sputter. It would only sputter when I gave it gas from a dead stop at a stop light until second gear. Then it ran smooth. I have taken the carb off, disassembled it, and cleaned it out thoroughly and still the problem occurs. If anyone has had this problem and solved it let me know what to do.
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Old 06-18-2012, 11:45 AM   #2
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Default Re: Carb Sputtering issue

Does the accelerator pump give a good shot of gas down each bore when the throttle is opened?
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Old 06-18-2012, 12:29 PM   #3
cropro27
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Default Re: Carb Sputtering issue

Yes. There is good gas flow out of the jets. I never had this problem until I got the rebuilt carb. I just don't understand that it only happens when the engine is warm and when I give it gas from a dead stop and only until second gear. Once second gear engages it runs smooth.
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Old 06-18-2012, 01:26 PM   #4
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Default Re: Carb Sputtering issue

How does it idle? Try a little shot of carb cleaner down each bore and let us know if the engine speed picks up for a bit on one of the bores but not the other.
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Old 06-18-2012, 01:36 PM   #5
cropro27
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Default Re: Carb Sputtering issue

It idles fine and yes both bores cause the engine to speed up for a bit.
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Old 06-18-2012, 02:39 PM   #6
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Default Re: Carb Sputtering issue

I think you're going to need to borrow or buy a vacuum gauge to diagnose this. Also, just to confirm is your ignition timing set somewhere between 0-10 deg before tdc? And is the smog system installed and working on this engine?
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Old 06-18-2012, 02:43 PM   #7
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Default Re: Carb Sputtering issue

What carb model is this?
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Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVWR/12K# winch
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Old 06-18-2012, 02:48 PM   #8
cropro27
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Default Re: Carb Sputtering issue

I really don't think it's a timing problem. I had that done by someone who knows what they are doing. It only sputters when I give it gas from a dead stop.
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Old 06-18-2012, 02:51 PM   #9
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Default Re: Carb Sputtering issue

Scoutboy74 it's a Holley 2bbl for a 304 v8.
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Old 06-18-2012, 04:30 PM   #10
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Default Re: Carb Sputtering issue

Fair enough on the timing. Doesn't sound like you have a timing light. Just trying to rule out the obvious. Would you check the distributor and see if it's tight? Also that the carb is snugly bolted to the manifold. And that the vacuum hoses are connected.
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Old 06-18-2012, 04:43 PM   #11
cropro27
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Default Re: Carb Sputtering issue

Everything is tight and connected. Plugs look good. Do you think that a carb spacer might be the answer? I'm not mechanic so I'm not going to tear into the engine and I don't think there is a mechanic in my area that knows scouts.
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Old 06-18-2012, 04:47 PM   #12
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Default Re: Carb Sputtering issue

Adding a carb spacer May add a few hp, but don't start changing things until this problem is resolved. What was the problem with the old carb? And can you get a vacuum gauge?
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Old 06-18-2012, 04:59 PM   #13
cropro27
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Default Re: Carb Sputtering issue

There was nothing wrong with it. Other then it was 30 + years old. I never wanted to get rid of it. I would have to buy the vacuum gague. What are you thinking with the vacuum?
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Old 06-18-2012, 08:45 PM   #14
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Default Re: Carb Sputtering issue

Quote:
Originally Posted by cropro27 View Post
scoutboy74 it's a Holley 2bbl for a 304 v8.
That's a bit vague. Can you provide a list number? You'll find it on the front of the airhorn, or post some pics if that would be easier. We might see something obviously amiss with the setup.
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Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVWR/12K# winch
Hooty - '74 SII 4x4 - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x11.5 TSLs/33g Fuel/8K# winch
Lemuel - '72 1210 LWB 4x4 CS - 304/TF727/NP205/RA D60 4.10 - "Pull Lemuel, pull!"
Mongo - '71 1210 LWB 2WD - 345/TF727/RA17 D60 4.10 Krac-lok - "Mongo love candy! Duh, huh, huh!"
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Old 06-19-2012, 07:49 AM   #15
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Default Re: Carb Sputtering issue

Read this link: how to use and interpret a vacuum gauge Or do a search on how to read an automotive vacuum gauge. With one you can tell a lot about how an engine is running. They cost around $20 and can be real handy to have.
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