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SBC won't run with choke open after warmed up

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Old Dec 10, 2012 | 11:43 AM
  #1  
SPEEDSKATER's Avatar
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Engine: sbc
Transmission: 700R4
SBC won't run with choke open after warmed up

SBC in an 83 TA. Just installed new 292H comp cam, comp rods, springs, lifters. Holley dominator intake, Holley 750, HEI with msd 6. Has elec. fuel pump with regulator. Has gas.

Broke cam in and didn't time it. Sat for 2 months. Yesterday, tried to start, hard time getting it started. Had choke closed, it started. Once warm, choke off and open, and it dies. It only runs when choke is slightly open. Open if up all the way and it dies immediately.

Has new hoses and don't notice any vac leaks. Why is it stalling when choke is opened up?

Thanks for any help.
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Old Dec 10, 2012 | 06:59 PM
  #2  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: SBC won't run with choke open after warmed up

Originally Posted by SPEEDSKATER
didn't time it.
Could account for some of your problem

Originally Posted by SPEEDSKATER
Just installed new 292H comp cam,
Why is it stalling when choke is opened up?
Serious cam ( You don't say what engine / what CR ? )
244/244 duration cam is not going to idle anywhere near stock settings;
Have you done the other mods ( idle speed / dist timing / etc ) required when installing a cam with this much ( 71 degrees ) overlap ?
Online guys are saying the 292H only pulled 9-10 inches of vacuum, which means you power brakes prob won't work too well either

Last edited by vetteoz; Dec 10, 2012 at 07:09 PM.
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Old Dec 11, 2012 | 08:27 AM
  #3  
SPEEDSKATER's Avatar
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Engine: sbc
Transmission: 700R4
Re: SBC won't run with choke open after warmed up

350 sbc and a friend helped who knows about hot rods but now i cant get ahold of him to finish this thing. I have a booster for my brakes because of that.
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