need help with this - Team Camaro Tech
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post #1 of 3 (permalink) Old Nov 12th, 05, 06:03 PM Thread Starter
Senior Tech
 
Join Date: Nov 2002
Location: petersburg,NewJersey
Posts: 200
need help with this

I am having a problem with my car running rich. I have been fighting the problem since I got it back from the body and paint (1 year 3 months). It seems like all the plugs are black except 1 & 3. It started out wet and black but when I changed my fuel pump the plugs arent wet but still black. Also the secondary air/fuel screws seem to work properly, when I turn them in the engine will shut down but I can turn the primaries in all the way and the car wont shut off. My original fuel pump was 6 psi when it was new then moved up to 7 psi thats why I changed it and it seems to make a difference but now that the plugs are dry and black I still have an issue and any advice would be appreciated. thx

1969 camaro convertible, sm blk 350 trick flow heads, m21 muncie, 3.73 rear. hugger orange with blacks stripes. 12.90 @ 107mph
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post #2 of 3 (permalink) Old Nov 13th, 05, 04:37 PM
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Dave
 
Join Date: Oct 2005
Location: Rhode Island
Posts: 1,356
Re: need help with this

Just from your description, it sounds like the secondary carb plates are cracked open. I'm assuming it's a Holley, since you mention 4-corner idle adjustment screws. There may be other carbs with 4-corner adjustment, so please nobody bite my head off.

Anyway, there is an adjustment screw that will allow the secondary plates to close all the way. I would start there. Your adjustment at idle should come mostly from the primary. I would check the carb manufacturer's web site and get instructions on setting the primary and secondary butterflies.

Also, an easy test would be to swap out another carb from a buddie's car; one that you know is running properly. That way, you could see if the carb is actually the problem. You could have any one (or more) of a number of other issues; vacuum leak, bad cap, rotor, wires, coil, etc, etc..........

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 3 (permalink) Old Nov 14th, 05, 06:39 AM Thread Starter
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Join Date: Nov 2002
Location: petersburg,NewJersey
Posts: 200
Re: need help with this

thats a good idea to swap carbs just gotta find someone willing. ill try that since it seems to be the easiest thing to do thx.

1969 camaro convertible, sm blk 350 trick flow heads, m21 muncie, 3.73 rear. hugger orange with blacks stripes. 12.90 @ 107mph
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