Carb Trouble - Team Camaro Tech
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post #1 of 11 (permalink) Old Jul 11th, 01, 06:00 PM Thread Starter
 
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I'm working on my buddy's 79 Camaro with a
Rodchester Carb. It won't idle smooth and
gas is leaking from one of the venturies
next to the squirter, down on the butterflies. Any ideas what is causing this??? Thanks, Greg
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post #2 of 11 (permalink) Old Jul 12th, 01, 01:09 AM
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Float level too high. Worn out would be a good suggestion.

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post #3 of 11 (permalink) Old Jul 12th, 01, 01:42 AM
 
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Get your self a carb kit, a couple of cans of 2plus2 carb cleaner ( not gumout that product dosn't work as well ), avalibale at Napa and do a rebuild. Tear carb down, completly clean and blow out every passage way, reaseble and set up clearences. Set mixture screws two turns out from seated position. This will get you in the ball park for start up. With car running, set idle as low as posible with out car stalling, place a vacuum gage on lower carb base plate to read manifold vacuum. Adjust your mix screws in and out, one at a time to establish your highest vacuum reading. You should recheck your settings for a second time after your intial first setting. Reset your idle screw to needed RPM, take it out for the road test. One last thing to look for, if you have a brass float in the carb check for fuel infiltration, if you have this problem replace flot. Good luck.
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post #4 of 11 (permalink) Old Jul 12th, 01, 02:12 PM
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Take it to a Carb restorer and get it rebuilt. I had a couple done over the years and these guys know their business. The car will run like a dream and the leaks will be gone. No more headaches its worth the money! Make sure he specializes in old carbs.

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post #5 of 11 (permalink) Old Jul 14th, 01, 06:47 AM
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Check the float they get loaded with gas. When you have the top of the carb off put a straight edge across the bottom part of the top piece between the front mounting holes. I will bet someone has over tightened it and warped the top {it is very common} If it's not too bad you can take a big file and get it straight again. If it's bad you can lay the edge on a block of wood and hit the top with a rubber hammer if you are carefull it will bend back almost flat. Don't over tighten those 2 front mounting bolts the factory put plastic washers under them to try to keep people from overtightening them but they get lost.

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post #6 of 11 (permalink) Old Jul 16th, 01, 12:01 PM
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GearHead,
I have a Holley 600 in good shape and did what you suggested to do. When I reach max vacuum, do I need to stop or give it another turn or two? I think I went about 2 more turns, and I think that this is a little too much. During road test it seamed to stumble or hesitate a little, but not that bad. Also I down jetted the carb from # 66ís to # 64ís. This process really worked well. The way that you explained it works for me.
Thanks.
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post #7 of 11 (permalink) Old Jul 16th, 01, 05:54 PM Thread Starter
 
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Thanks Guys for all the support.
Come to find out when I took the
top off there was a clogged air
vent to the ventury. I ran some
speaker wire through it and SHA-
WING!! no more dripping.

But now I've noticed the idle stumbles
kinda like a misfire in the ignition?
I also can feel it when I cruise
down the road but not when the car is
under acceleration.I adjusted the
air fuel mixture screws as recomended
but no luck.It does get better when
I adjust them way out but then I get
black smoke at the tail pipe from running
to rich. GRRR! This thing is making me crazy.
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post #8 of 11 (permalink) Old Jul 16th, 01, 07:43 PM
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Again, as already suggested...with that many problem going on, REBUILD!

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post #9 of 11 (permalink) Old Jul 17th, 01, 02:22 AM
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Sounds like you have a vacuum leak. Check the throttle shafts or the 5 miles of vacuum hose the thing has on it.

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post #10 of 11 (permalink) Old Jul 17th, 01, 06:23 AM
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Of course by sticking the wire through the vent actually pushed some of the gunk/dirt into the gas area, which will clog something up eventually. I agree with the rest, clean well and rebuild!

Kevin

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post #11 of 11 (permalink) Old Jul 17th, 01, 10:53 AM
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I went and put the vacuum gage back on and had to re-adjusted the carb again and I took the extra turns out and then upped the idle from 500 to about 650 RPM and did a road test, itís much better. I may need to step the jets back up (to maybe a # 65); weíll see how it acts for a week or so and then check the burn on the plugs.
Again, Thanks for the simply procedure on setting the air / fuel mix.
Mark (A.K.A. Z28 Mark)
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