General Category > Quadrajet Carb Talk and Tips

7029241 Buick carb

<< < (2/3) > >>

srb12:
Ignition problem resolved; it idles well now and I can kill it with the idle mixture screws.

Idle tubes: .035
DCR: .051
Bypass air: none.
Low idle: .083
Upper idle: .052
Main air body: .055
Main air horn: 0.43

Jets: .070
Rods: 44B
Secondary rods: AY.

Now I have to learn more about the carb.
Idling and part throttle are performing ok, but when I press the pedal deeper it holds back. I do see that the manual prescribes .045, so perhaps my 44B is wrong?
But I'm not experienced yet to tell if that has to do with the secondary system, or the primary or perhaps something else.

Cliff Ruggles:
The B series rods for that carburetor all have .026" tips so at heavy/full throttle same metering with any particular jet being used......

srb12:
I changed a few things on the secondary side. The hanger wasn't level, the airvalve spring was not wound up enough and I made a minor change on the throttle valve linkage.

Unfortunately I couldn't test it. It did start, ran very roughly for 15 seconds and then died on me. Tried to start it again, could get it to run for a few times, but very roughly and short only. Had the idea it was very rich. So I'm thinking the carb is leaking in the intake in the course a few days. I did test the well plugs, but only gravity feed with fuel. And I now see your method with soap, so will do that next.
 

Kenth:
1969 and later Qjets rarely if ever have any problems with leaking bottom plugs.

Look for problems in the fuel inlet system, worn inlet needle & seat, old expired float, float setting etc.

srb12:
Needle and seat are new from Cliff. Also passed pressure test.
I did revisit my choke settings and changed them a little bit, but I can see there is quite some fuel in the plenum. And I let it evaporate this afternoon and installed carb empty.
Choke plate is closed, vacuum break adjustment is 0.18 with diaphragm seated.
Fast idle is 3 turns after contact with cam.

Still think it's flooded. Sometimes seems to catch with choke unloader.

Strange. Had my choke on par, fired up immediately.

Checked spark once again, but thats fine. Initial is 8 degrees + manifold vacuum (which is per manual)

Edit: I have set my float height correct. Old float, how would I know? It was running well 2 days ago. Only with heavier throttle had some issues, but the secondary system had some faulty settings. But that doesn't do anything when idling/starting.

Have the carb now at WOT with a tie so everything can evaporate from the plenum.

Navigation

[0] Message Index

[#] Next page

[*] Previous page