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engine wont idle, or stay running

3K views 16 replies 7 participants last post by  Torque454 
#1 ·
well to start off my engine will start and then usualy idle high for mabey 10-20 sec and then shut off. Ive tried messing with the timimg and carb a bunchhh and nothing seems to help...any ideas??

also this is a new motor

heres the set up:
355 w/flat tops, 64cc/197 al. heads w/ 1.5 rollers, air gap intake, 750 speed demon carb, and comp cams 282 hyd. roller .510/.520 lift, 282/288 duration230/236 duration @ 50

thanks for any help!
-andy
 
#6 ·
lowandloud91 said:
the carb and intake gasket are brand new, and yes itll start back up.....i once started it and held it at about 3000 rpms and it stayed there and then it just shut off like i turned the key off, vacuum ports look good also
If it starts right back up it could be running out of fuel. Generally an electronics(ignition) issue will take a while to cool before it will work again.
I would start buy checking your float levels and put a fuel pressure gauge on it.
 
#13 ·
the back float level registers about 1/4 way on the window(there is 3 horizontal lines its at almost the first one) and the front does not even register unless u shake the truck and then it sloshes a little bit on the window. there is four little screws(2 on each side of each bowl) that i have turned 2 1/2 turns out. there is also two larger screws on top of each bowl with a nut. im not sure how to go about adjusting them but when i try to back the screw out some to i assume allow more fuel and tighten the nut, the nut will not tighten and fuel leaks out.
 
#14 ·
lowandloud91 said:
the back float level registers about 1/4 way on the window(there is 3 horizontal lines its at almost the first one) and the front does not even register unless u shake the truck and then it sloshes a little bit on the window. there is four little screws(2 on each side of each bowl) that i have turned 2 1/2 turns out. there is also two larger screws on top of each bowl with a nut. im not sure how to go about adjusting them but when i try to back the screw out some to i assume allow more fuel and tighten the nut, the nut will not tighten and fuel leaks out.
It sounds like the front bowl is running low of fuel. In adjusting the float level, you need to loosen the screw, and turn the nut counter clockwise. I have found that 3 & 1/4 to 3 & 1/2 threads showing on the threads above the float bowl(with the nut removed) is pretty close to the right setting.

When you 'tighten' the 'nut', you are lowering the float level.
 
#16 ·
lowandloud91 said:
mk ill do that and see what happens. i know this shouldnt matter at all, i dont think anyways, but my belt is not on. it should run without that right? if the carb adjusting does not fix the problem what should i do next?


thanks for all the input!
If you are talking about the alternator belt, yes it can make a difference. Low voltage will cause the ignition to be weak and your electric pump to pump less.
 
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