Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Cant get new quadrajet to run

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CamaroMan79:

--- Quote from: TommyK on June 06, 2013, 08:24:30 AM ---Can you give us a little history on the engine in question? Was this previously running well with a different carb? If so what kind?

How much have you actually driven it with the new carb? Have you pulled any plugs to see what they look like?

Have you put a vacuum gauge on it? Possible vacuum leak might explain the 18:1.

I am not familiar with the cam but I would try fattening up the idle mixture with the mixture screws and see what that does. It may need more fuel of idle than it is getting.
--- End quote ---

Sorry for the laste responses, Iave been really busy,

The engine is a AFR 195 roller cam 383 stroker engine. 10:1 compression in a 78Z camaro.  I have lookedat plugs and they are solid black with soot still indciation too much fuel.  My val.alves are really carboned up as well.

 Before putting on the Quadrajet and quad intake i had a,  rpm airgap intake with a 670 street avenger.  It ran good but the Holley would always run rich.  About  a day before I decided to swap out to a quadrajet intake and carb the engine started idleing inconstantly.  Like up and down but only by about 200-300 rpms.  I could not find an vacuum leak anywhere

I put the new quad intake and quadrajet on and am having problems ever since.  i actually thought that i have a vacuum leak still this new intake so i took it off because I couldnt get anymore than 10hg of vacuum in park at idle.

I havent put the quad intake back on yet though Since I had my heads off to swap out head gaskets.

I drove the car with the new SMI stage 2 quadrajet maybe a mile total. It Falls flat on its face pops backfires I cant even spin the tires.  MY AFR goes crazy lean getting as high as 17-18:1

CamaroMan79:

--- Quote from: Shark Racer on June 06, 2013, 08:24:30 AM ---When you say "As soon as I try to give it gas it goes up to 18:1", do you mean, AS SOON AS, or with a bit of constant throttle angle higher than idle?

Very different questions.

"As soon as", means that you're not getting enough pump shot. Do you know what accelerator pump seal he used? How long ago was the rebuild? Have you verified that you're getting a very solid pump shot?

If it's with a steady throttle angle, then what you're looking at is a metering rod adjustment.

This of course assumes it's not a vacuum leak, as mentioned by Tommy.

--- End quote ---

As soon as I get it any load the AFR starts to lean out and if I get into the throttle a lill bit the wide band 02 spikes lean.

Shark Racer:
Are you getting a pump shot from the accel pump? Which hole is the accel pump link attached to?

CamaroMan79:

--- Quote from: Shark Racer on June 29, 2013, 12:55:59 PM ---Are you getting a pump shot from the accel pump? Which hole is the accel pump link attached to?

--- End quote ---

Not sure about the pump shot but the linakge is on the outside hole so its getting the max shot.

Shark Racer:
The outside hole is less shot than the inside hole. Try the inside hole.

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