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Old 05-08-2008, 09:46 PM
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My 350 sbc parts chaser!

Ok, this is NOT hot rod stuff but it is sort of as its my parts chaser/push truck '79 GMC Van. Its been sitting in storage for 2 yrs and now fired and running ok, except, when it runs cold it runs a bit rough but stays on the bubble, BUT when it's slid into any gear it SLOWLY dies out. I can quickly get it into park/neutral & it recovers but its a bit scary when I'm trying to get across a freeway with guys coming at me at 110! I tried the usual stuff with the choke etc, & idle screws and the drivers side went all the way in with no change in the rpm, but the passenger side idle screw stalled the engine about 2 screws from home & I've not since been able to get it to run properly no matter what I do with ANY settings!!

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Old 05-08-2008, 10:23 PM
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First thing i'd do is get a can of spray carb cleaner with the plastic tubing. Remove the two idle screws and get the tube into the hole and give em a blast. Then on the top of the carb, look for the little holes on the top of the nozzle and shoot down them too. Do that a couple times then put the screws back in. GENTLY seat them and then back out 2 1/2 turns and see how it runs.

If that fails, get it running and while under the hood and holding the speed up, push the choke shut and open the throttle more. Let the choke go just before it loads up and dies. If anything is stuck in a passage somewhere, this almost always sucks it out.

Usually works every time for me.
Mark
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Old 05-09-2008, 07:36 PM
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Quote:
Originally Posted by Jmark
First thing i'd do is get a can of spray carb cleaner with the plastic tubing. Remove the two idle screws and get the tube into the hole and give em a blast. Then on the top of the carb, look for the little holes on the top of the nozzle and shoot down them too. Do that a couple times then put the screws back in. GENTLY seat them and then back out 2 1/2 turns and see how it runs.

If that fails, get it running and while under the hood and holding the speed up, push the choke shut and open the throttle more. Let the choke go just before it loads up and dies. If anything is stuck in a passage somewhere, this almost always sucks it out.

Usually works every time for me.
Mark
Thanks for the tips! I did everything you said but still have the same problem. Seems like every time I put load on it, it just fades away & dies. Picks up, slows down, etc.
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Old 05-10-2008, 07:36 AM
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Hmmm,

How is the fuel pressure? Have you changed the fuel filter yet? Don't forget the filter at the inlet to the carb if it's a GM carb. They can't handle too much crap before clogging.
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Old 05-10-2008, 09:13 AM
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What this guy said... I would do a fuel pressure test on the fuel filter. I ran into that same fuel starvation problem once. From your description, I would pop for a new fuel filter.
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Old 05-10-2008, 11:51 AM
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Yes, I eliminated the little paper filter that is at the Quadrajet entry and put a new inline filter onlong the line to the fuel pump, no change! Just wondering if its to do with any of the smog equip that is still on the van?? EGR? or any other?
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