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-   -   Computer controlled quadrajet on an early 350 (http://www.hotrodders.com/forum/computer-controlled-quadrajet-early-350-a-222551.html)

4speed57 08-04-2012 11:02 PM

Computer controlled quadrajet on an early 350
 
I just picked up a quadrajet today for $10. After checking the numbers it came off a 1986 chevy truck. I've read and heard you can't run one of these on an older engine without problems. From what I'm seeing on the carb, most of the ecm crap is external. It looks like I could remove it all and just run a manual choke. After that wouldn't it be the same as an older carb?

One thing that caught my eye with this carb is the idle mixture screws aren't capped off. I've always noticed with the ECM controlled carbs, the idle mixture screws are inaccessible.

I want to order a $15 rebuild kit and have a $25 carb. Will this work on my early 350 Chevy?

Thanks for your time,

spinn 08-05-2012 06:30 AM

Does it have the double capacity accelerator pump? That was the problem it would reduce to the normal /half volume once it warmed to remp. If you left it disconnected you would have the incorrect pump shot.

Those idle mixture caps can be removed. It means its likey someone was adjusting it.

They work awesome on a driven vehicle. They can make as much power as any other carb of its size. Not like a holley is going to make more power just cause it is a holley. That is superstition and brand loyalty I havent got time for.

Another great carb is the old AVS.

LATECH 08-05-2012 08:02 AM

2 Attachment(s)
The CCC carb is the one in the picture.Part number 210 is the TPS , it provides the computer with feedback in regards to the throttle posistion.
Part number 225 is the mixture control solenoid. It wont control A/F ratio without a computer. If this is the carb you have, at best it will run pig rich, foul plugs and be a total PITA.
Get an older non CCC quadrajet.
Put that thing back on the shelf.

4speed57 08-05-2012 11:08 AM

Thanks for the replies guys.

LATECH, my carb is the same as the one in the picture. I figured there had to be some internal gizmos that control the mixture.

I have two of the carbs that are in good shape. Too bad I can't use them!

Thanks again!

Joe

joe_padavano 08-06-2012 11:41 AM

As Spinn noted, 1986 Chevy trucks could have used either the computer controlled CCC carb OR the dual-pump shot carb. The former is totally computer controlled. The latter is NOT, except for the pump shot solenoid. The look almost identical from the outside. Both have the two-wire electrical connector on the upper front passenger side of the carb. The CCC carb ALSO has the three-wire TPS connector on the front driver's side. Of course, inside they are easy to tell apart. The dual pump shot carb has conventional primary jets and metering rods. The CCC carb has the special spring loaded jet/rod assemblies and a solenoid that pulses them up and down.

You need to be completely sure of what you have. In 1986 the CCC carbs were only used on half-ton pickups sold in Calif. MOST of the trucks got the dual pump shot carb, so it is much more common. If you have the CCC carb, you're out of luck. The dual pump shot carb, on the other hand, can be made to run just fine on an early 350. The accelerator pump was set up lean for emissions, so the larger pump shot was only used when the truck was cold. If you recalibrate the pump shot, you can either leave the solenoid in place or put a plug in the hole in the float bowl. If you want to keep the dual shot capability, simply wire a toggle switch that provides 12v to the solenoid. The rest of the carb is conventional Qjet.


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