Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Rebuilt 4988S Not So Good.
Ozzmann:
Think I found the cause of flooding, had no spark, I must have flooded it while attempting restart.
Damn dissy!
I took the idle down channel out to .058, still cant get the throttle plates to close enough to kill the ported vacuum.
When I was rebuilding the main body, the idle bypass air void holes were plugged, so I drilled them out to .140, do you think I should open them up more? ???
This is really starting to annoy me >:(
Oh and thanks for all the advice Cliff, your a legend.
Ozzmann:
I have another query, Is choke pull off meant to have full vacuum at idle ?
After having a closer look at my carb the ported outlet and the choke pull off both connect to the same void area in the main body.
If this is the case I will never get a ported vacuum, correct or am I just confusing myself.
Ozzmann:
Ok so I'm a little slow, it would seem this whole exercise in trying to get my ported vacuum working correctly was a waste of time, I have no ported outlets.
I should have looked more closely at the carb first time I had it apart.
Still not sure if my throttle plates are closing enough at idle now, how can I check that, with no port vac Cliff?
What can I do with my vac advance, I really wanted to connect to ported.
With full manifold when I shift into Drive the revs drop a good 200rpm and car almost dies, that's why I wanted to get the ported working to try.
Can a ported outlet be put on to this carb?
Cliff Ruggles:
In order to get manifold vacuum to work, you will need a can with a really low tension spring in it.
I don't like doing this, ported vacuum works fine for what you are trying to do.
The port is easily added to the main casting in the factory location. However, it is very difficult to add the source hole in the throttle body, as it MUST be precisely located just above the primary throttle plates at idle. The source location is critical, as the port must be uncovered with the slightest movement of the throttle off idle.
I use a really sharp punch to locate the hole, then drill it with a very tiny drill bit, about .040". I've done a lot of them here, but it's an easy thing to mess up unless you have some practice.....Cliff
Ozzmann:
--- Quote ---In order to get manifold vacuum to work, you will need a can with a really low tension spring in it.
--- End quote ---
I have a Accel breakerless dissy with a adjustable vacuum advance.
It's just the spring tension you can adjust, changing how much vacuum is required to enable the advance, would I be correct in thinking that. I don't see how putting a allen key in the pipe is going to change how much advance I get.
So if I have to keep manifold vacuum, I want to limited how much, correct?
I believe it's adding to much at the moment, which is the reason it dies in rpm so much when put into drive.
Please correct me if I 'm wrong here Cliff, I am doing a lot of assuming.
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