Run problem-Carb? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 18th, 10, 07:44 AM Thread Starter
Dave
 
Join Date: Sep 2007
Location: Kansas City
Posts: 10
Run problem-Carb?

Hi Guys, I've just gotten my '69 Z running and I have a run problem that I believe is the carbs fault???? I get the car warmed up and the idle set to 900 rpm, the timing set to 6-8 degrees advance; (vacuum advance disconnected, carb plugged) and it sounds great. (If I advance the static timing it does run smoother.) Then the idle will all of a sudden jump up to 2000 or higher and stay there.

Specs:
.060 over DZ block
1178 crank
Comps version of the 30-30 cam-solid lifters
186 heads-2.02s-1.60s
KB 11-1 replacement forged pistons
472 intake
4053 Holley carb
480 distributor

Let me know if you need more info in order to help me track this one down. I'm getting frustrated I bet one of you guys has seen this or something similiar and may be able to help me out. Thank you in advance!!!! Dave
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post #2 of 7 (permalink) Old Jul 18th, 10, 01:02 PM
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Dan Ensign
 
Join Date: Jan 2007
Location: Claverack,NY
Posts: 366
Re: Run problem-Carb?

Is the centifugal advance taking over when you raise the static timing and increasing the idle speed, how mcu are you advancing the timing before the idle takes off?

Dan E.
69 SS396 4spd. 4.10 posi. x66 coupe
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post #3 of 7 (permalink) Old Jul 18th, 10, 01:45 PM Thread Starter
Dave
 
Join Date: Sep 2007
Location: Kansas City
Posts: 10
Re: Run problem-Carb?

Hey Dan, Thanks for your reply! I'm begining to think my distributor is all *&^#@#^&* up! I think I'll mess around with the advance because I think this is what's going on. I have been spending WAAAAY too much time on this issue-usually you just set the timing and go. I was already on this train of thought when I checked back on this forum. I guess great minds think alike! Well yours anyway! Thanks for your input! Dave
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post #4 of 7 (permalink) Old Jul 18th, 10, 01:52 PM
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Keith
 
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Location: Harrisburg, PA
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Re: Run problem-Carb?

advance th etiming to where you want it to be, then re-adjust the carb throttle screw and mixture...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #5 of 7 (permalink) Old Jul 19th, 10, 06:17 AM Thread Starter
Dave
 
Join Date: Sep 2007
Location: Kansas City
Posts: 10
Re: Run problem-Carb?

Hi Kieth, thanks for your response!

I took it around the block again and I'm convinced I have problems with my distributor. I put heavier springs on my advance weights and that didn't change the way it's running. (I purchased an advance kit and installed medium weight springs when I installed the distributor.) I may have some points lying around here to try those-or I'll run to NAPA and see what that does; I've always had good luck with Echlin products....

Under load it's cutting out at about 2000-2200 rpm and rather than try to force it past I shift to the next gear and then at about 2000 it starts cutting out again. Maybe the coil is past retirement age....The problem seems to be in my fire side of the air-fuel-fire triangle. I have an MSD distributor that I might try and see what that does....

I'll figure this out one way or another-THANKS AGAIN!!!! Dave
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post #6 of 7 (permalink) Old Jul 19th, 10, 05:57 PM
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Keith
 
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Re: Run problem-Carb?

If I can suggest--a lot of folks spend a ton of cash on different dizzy/ignition setups...

I have found that a mostly stock (maybe upgrade the coil) HEI upgrade is cost efficient, and will give you all of the fire you need, unless you are building an all-out race machine...GM got it right with the HEI, and it is a simple upgrade...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #7 of 7 (permalink) Old Jul 19th, 10, 06:54 PM Thread Starter
Dave
 
Join Date: Sep 2007
Location: Kansas City
Posts: 10
Re: Run problem-Carb?

I completely concur. In fact of the 'points type' distributors the GM versions were the best. I know that in past cars I've turned over 8,000 RPM with a stock GM distributor-accidently of course-my foot got suddenly too heavy....I only did that a couple of times-but if you've EVER wound a small block up that tight-you'll NEVER forget that sound! Believe it or not-it stayed together!

My intention with this car is to sell it so I can start on my RS Z. That said, I intended to have this car go out with a fully functioning '480' distributor. If that can't happen it can't-but I want to make evey attempt to make it work. You are right, an HEI would take care of the run problem-but it's not original.

Thanks again for your help Keith, I truly appreciate it! Dave
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