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Old 06-26-2004, 04:29 PM
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Engine stalling problem

I just recently finished assembling and starting my 454 and am running into a strange problem. After getting the fresh rebuild running, I broke in the cam for about 20 minutes @ 2000 RPMís. I then readjusted the valves and set the timing @ about 16 degrees btdc. (I have a comp cams 268h extreme energy cam and this seems to be the best timing for it) The carb that I currently have on the car is a Holley 650dp with #68 jets on the primary side, and #72ís on the secondary side. Hereís my problem / question for everyone. When I start the engine cold it runs fine and idles perfectly. As the engine warms up the idle starts to get rough and the engine wants to die. Even if I bump the idle up or rev the motor it still stumbles and eventually dies. As it starts to die the exhaust note changes too, it goes from a clean solid low rumble to a raspy coughing stall.

When I first started trying to fix this problem, I thought it might be the HEI ignition system getting hot and dying, and since I had a spare module and coil sitting around I changed them out. That didnít fix the problem so I now suspect the carb is the problem. Since I need to go to a bigger carb anyhow I figure this is the next logical step, but I wanted to ask everyone for some advice first.

Sound like a carb problem to you guys? Whaddya think about the Edelbrock #1407 750cfm carb for my BBC?, or should I stay with Holley and get another double pumper. Only upgrade to a 750?

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Old 06-26-2004, 04:42 PM
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I`d check the carb and the fuel pressure, when it goes to coughing, get out and give it a light dose of throttle and take a look at the pump shot, if it`s giving it little to no fuel then it`s not getting any. don`t stick your head over the carb while doing so it case it back fires through the carb and you end up with a face full. also you can shine a light in the carbs throat and see if fuel is coming out of the boosters, if so too much fuel pressure or a stuck needle or the floats too high. however, the problem doesn`t sound like too much fuel, it sounds like not enough.
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Old 01-28-2006, 05:02 PM
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Quote:
Originally Posted by JamesRS
I just recently finished assembling and starting my 454 and am running into a strange problem. After getting the fresh rebuild running, I broke in the cam for about 20 minutes @ 2000 RPMís. I then readjusted the valves and set the timing @ about 16 degrees btdc. (I have a comp cams 268h extreme energy cam and this seems to be the best timing for it) The carb that I currently have on the car is a Holley 650dp with #68 jets on the primary side, and #72ís on the secondary side. Hereís my problem / question for everyone. When I start the engine cold it runs fine and idles perfectly. As the engine warms up the idle starts to get rough and the engine wants to die. Even if I bump the idle up or rev the motor it still stumbles and eventually dies. As it starts to die the exhaust note changes too, it goes from a clean solid low rumble to a raspy coughing stall.

When I first started trying to fix this problem, I thought it might be the HEI ignition system getting hot and dying, and since I had a spare module and coil sitting around I changed them out. That didnít fix the problem so I now suspect the carb is the problem. Since I need to go to a bigger carb anyhow I figure this is the next logical step, but I wanted to ask everyone for some advice first.

Sound like a carb problem to you guys? Whaddya think about the Edelbrock #1407 750cfm carb for my BBC?, or should I stay with Holley and get another double pumper. Only upgrade to a 750?
Is the choke opening after it warms up?
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Old 01-30-2006, 12:22 PM
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Thanks for the reply 2000Jack, but this post was from June 2004. I have since figured out the problem and corrected it. The problem was the Camshaft bolts. I didn't have a locking plate when I assembled the engine and the cam bolts and cam tab came loose. Timing would drift and this caused the engine to do all kinds of strange things. I was fortunate in that it stayed in the timing cover and didn't work its way into the oil pan where it could do some damage.
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