403 Olds CCC Swap Gone Wrong

[jpoole]

Car is a 1983. Carb was setup by SMI to use with a 403 with my cam and engine specs.

I posted up 18 inches of vacuum, taken at high idle from choke. Is this enough or what should I be looking for and at what RPM?

Thanks, Jeff

 

[DoubleV]

Do you know exactly what SMI did to your carb? Get a vacuum reading at curb idle once the engine's warmed up.

 

[jpoole]

Do you know exactly what SMI did to your carb? Get a vacuum reading at curb idle once the engine's warmed up.

What vacuum am I looking for?

SMI did a stage II package on it.

•Main jet and metering rods selected for clean cruise mixture and strong part throttle response and acceleration.
•Secondary metering rods and hanger selected and high speed air bleeds resized for maxium full throttle horsepower and torque.
•All circuits will be modified and tuned to match the specifications of your engine combination, Including:
•Apply epoxy to main body casting plug to eliminate common "leak down" problem associated with Quadrajets.
•Choke pull-off modified for faster secondary air valve response.
•CRO(channel restriction orifice) resized for crisp off-idle and part throttle response.
•High capacity accelerator pump featuring materials that are resistant to alcohol and other additive commonly found in today's fuel
•Idle down tube(idle jet) and idle air bleed resized for smooth idle quality with performance camshafts.
•Idle, transition, main, and high speed circuits modified to provided optimum fuel curve for YOUR engine
•Install bushings in baseplate to eliminate any potential vacuum leaks at primary throttle shaft.
•Intended for moderately modified street performance vehicles.
•Assembled using the highest quality components, including:
•Surface baseplate for flatness and glassbead for bright silver finish.
•High flow .130" needle and seat for consistent float bowl fuel volume
•Nitrophyl solid composite float that can't crack or sink.
•Premium quality gaskets

Thanks, Jeff

 

[DoubleV]

Just hook a vacuum gauge up to any manifold vacuum source and get a reading at idle.

 

[jpoole]

Yea, wanting to know what reading i am looking for? how many inches is good.

Thanks, Jeff

 

[88hurstolds]

Can the chip be updated to work? Seems like there was a place that could burn chips to allow stuff like this.

If you want to reprogram a chip you will need a CCC system from an '88 VINY Cutlass.
My suggestion is to find an ECM from an '83 Hurst Olds, they are the most desirable ECM's and have the richest mixture out of any GM produced and are sought after by the Camaro guys from what I've seen.
'83 VIN9 ECM's are not easy to come by since everyone tosses them when parting these cars out... BPA is the PROM code.
I have an NOS GM BPA PROM if interested, never installed...

 

[jpoole]

Thanks for the offer but my car is an 83 Hurst. So I should be good.

 

[88hurstolds]

These CCC systems are very touchy and can be mysterious sometimes.
One thing I just encountered with my '85 442 a few weeks ago was a bad prom and it had rough starts and wanted to die all the time.
It was messing with the RVB and EGR by cycling them on and off all the time.
The car sounded like it was excessively knocking during startup like I had thrown a rod, it was that bad...
It was not throwing any codes either which had me very confused as to what the problem was.
I had to disconnect the EGR solenoid block which also controls the RVB and had to bypass the solenoid by hooking up the RVB to the back of the carb and EGR to the ported vacuum just like earlier setups to fix the issue temporarily.
I just installed a used Hypertech chip and it solved the issues and runs better than ever especially with the additional advance it gives at WOT.
I have an NOS one of those lying around too, always good to have spare parts with these CCC systems.
I've been buying GM/Delco sensors whenever I can over the past 2 years, much of this stuff is better than the aftermarket stuff, especially the O2 sensors.
I have heard people having issues with Bocsh O2 sensors causing rough idle as well.
Use GM when you can...

 

[DoubleV]

Yea, wanting to know what reading i am looking for? how many inches is good.

Thanks, Jeff

Anything in the upper teens should be good I think.

 

[jpoole]

Well, pulled the carb and swapped the MC solenoid with a proper GM working one and there was no change.

Also, hooked up the vacuum gauge again and it was 15 dropping to 12 after proper warm up and idling.

I think I am going to give up and install Holley and HEI.