bbc won't run anymore. - Team Camaro Tech
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post #1 of 48 (permalink) Old Jul 12th, 14, 02:15 PM Thread Starter
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bbc won't run anymore.

Im hoping someone has an idea about what's wrong. I ran it yesterday and it was running great. Then i put a new intake manifold on. Same intake, just a new one because i cracked the port for the temp sensor. So i rotated the engine to tdc and pulled the cap on the HEI distributor and marked it so it would go back in correctly. Changed out the manifold and put the distributor back in exactly how it came out. Mark lined up just how it should have.

Doesn't start. The most i can get it to do is backfire out of the carb with starting fluid. I've tried lifting the distributor and moving it a tooth forward and a tooth back. Nothing. I ohm tested the coil and its fine. Engine has spark. Spark plugs are pretty black so im going to start cleaning them now and hoping someone has some ideas for me to try when i get done.

Thanks.
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post #2 of 48 (permalink) Old Jul 12th, 14, 02:38 PM
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Re: bbc won't run anymore.

I would say somehow you got the distributor in there incorrectly. Get it back to TDC on #1, then verify your on #1 with the distributor. Pull the cap to see where the rotor is to verify.

If you have spark, fuel and are close on timing, it will at least run.

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post #3 of 48 (permalink) Old Jul 12th, 14, 03:20 PM
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Re: bbc won't run anymore.

Yep ,, distributor is off.

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post #4 of 48 (permalink) Old Jul 12th, 14, 03:27 PM
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Re: bbc won't run anymore.

Yeah I agree. Sounds like the dizzy jumped a tooth on the final inch so you are off just a bit.


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post #5 of 48 (permalink) Old Jul 12th, 14, 03:39 PM
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Re: bbc won't run anymore.

Be sure that the TDC you have is on compression the stroke. Get your timing mark where you can see it coming in to view, put a breaker bar with 3/4 socket on the harmonic balancer bolt, remove #1 spark plug. Put your finger over the spark plug hole and pull on the bar watching as it nears TDC. If you hear the sound of compression and your finger feels a build up of pressure thats it. If not your on exhaust stroke. Rotate it again to get to the compression stroke. Just did this last night.

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post #6 of 48 (permalink) Old Jul 12th, 14, 04:05 PM
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Re: bbc won't run anymore.

Quote:
Originally Posted by rad454 View Post
Be sure that the TDC you have is on compression the stroke. Get your timing mark where you can see it coming in to view, put a breaker bar with 3/4 socket on the harmonic balancer bolt, remove #1 spark plug. Put your finger over the spark plug hole and pull on the bar watching as it nears TDC. If you hear the sound of compression and your finger feels a build up of pressure thats it. If not your on exhaust stroke. Rotate it again to get to the compression stroke. Just did this last night.


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post #7 of 48 (permalink) Old Jul 12th, 14, 04:10 PM Thread Starter
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Re: bbc won't run anymore.

Well i did verify that its tdc compression by taking the valve cover off. Watched the intake valve go down then come back up as it neared tdc. I have the rotor pointed right at #1. The spark plugs were better than i was thinking, but i sanded them all anyway. I just don't get this.
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post #8 of 48 (permalink) Old Jul 12th, 14, 04:40 PM Thread Starter
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Re: bbc won't run anymore.

Unbelievable. Just did the finger thing. 180 out. How could that even happen. Mark still lines up and everything. So im gonna turn it around and see what happens.
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post #9 of 48 (permalink) Old Jul 12th, 14, 05:41 PM Thread Starter
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Re: bbc won't run anymore.

Well it was running but i think i need a new carb. It just dumped a bunch of gasoline down my intake and now its all flooded out.
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post #10 of 48 (permalink) Old Jul 12th, 14, 10:08 PM
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Re: bbc won't run anymore.

What carb are you running now? May just need a rebuild kit or reset the float and check metering rods for debris holding them up.


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post #11 of 48 (permalink) Old Jul 13th, 14, 12:18 AM Thread Starter
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Re: bbc won't run anymore.

Its a quadrajet. I did rebuild it guided by a quadrajet book, and i did some enlarging of holes also in the book. Stuff like that. Basically the idle screws do absolutely nothing, and it leaks gas out of the top gasket no matter how tight the screws are. I also sandblasted the entire carb inside and out before the rebuild so I probably ruined it.
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post #12 of 48 (permalink) Old Jul 13th, 14, 12:19 AM Thread Starter
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Re: bbc won't run anymore.

http://youtu.be/6O2xnZIKsxE


Last edited by 69-Pace; Jul 13th, 14 at 08:15 AM.
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post #13 of 48 (permalink) Old Jul 13th, 14, 08:21 AM
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Re: bbc won't run anymore.

I fixed your link so the video would embed.

Quote:
Originally Posted by Satatic View Post
Its a quadrajet. I did rebuild it guided by a quadrajet book, and i did some enlarging of holes also in the book. Stuff like that. Basically the idle screws do absolutely nothing, and it leaks gas out of the top gasket no matter how tight the screws are. I also sandblasted the entire carb inside and out before the rebuild so I probably ruined it.

I wouldn't think its ruined. Someone here just recently had the same issue with fuel leaking out the top and thought it was the top screws. It was the float.

Quote:
Originally Posted by Elmer View Post
To end up this thread I can report that modifying the float level from 9/32" to 3/8" did cure the problem with a leaking top cover. Have used the car for a couple of weeks and it doesn't leak any fuel. The top cover screws is not tightened as hard as before so I guess the screws did not come loose - the problem was the float level. The Qjet has number 17054929 and has been used for -74 Chevrolet/GMC trucks equipped with 350/400/454 ci engines. According to information I have found on internet the float level on these later Qjets should be 0.39-0.42".
Here is the whole thread https://www.camaros.net/forums/showth...ight=fuel+leak


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post #14 of 48 (permalink) Old Jul 13th, 14, 08:30 AM Thread Starter
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Re: bbc won't run anymore.

I'll give it a shot but the other issues make me think it needs replaced with the idle needles having no effect on anything. Plus the motor shakes a lot. You can see the shifter slapping around in the video. I think thats because I can't adjust the air fuel mixture.
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post #15 of 48 (permalink) Old Jul 13th, 14, 08:35 AM
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Re: bbc won't run anymore.

Still may be just debris. Maybe media from your sandblaster. Break it down and a good soak in a bucket of carb cleaner might just work the issue out.


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