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51
Diagnose a Quadrajet carburetor problem / Re: 17085292 Idle Speed
« Last post by Kenth on March 16, 2025, 09:06:40 AM »
BTW, this carb has no mixture solenoid.
It has the ordinary power piston, metering rods and jets.
The solenoid used is for the "dual capacity pump" feature.
52
Diagnose a Quadrajet carburetor problem / Re: 17085292 Idle Speed
« Last post by quadrajam on March 16, 2025, 09:00:11 AM »
Is the choke fully off and the fast idle cam out of the way?(Adjustment screw down low on passenger side)
Maybe a small vacuum leak?
Check that the throttle cable and trans cable are not tight at idle.
Make sure the link between primary and secondary shafts is not tight at idle.
Has the idle bypass air been modified?
Manifold or ported vaccum to advance can?

I have a couple of that same carb and no such problem.

QJ
53
Diagnose a Quadrajet carburetor problem / Re: 17085292 Idle Speed
« Last post by Kenth on March 16, 2025, 08:55:50 AM »
Vacuum leak or still on fast idle cam?
54
Diagnose a Quadrajet carburetor problem / 17085292 Idle Speed
« Last post by Raoul Ross on March 16, 2025, 06:56:59 AM »
85 Chev C10 Suburban. I cannot get the idle speed down. Idle speed is 900-1k

Idle speed screw is completely backed off tab. Unit was rebuilt at least once, the mixture screws are exposed. Timing is set to spec. Butterflies are closed on secondary side. Vacuum is 20in. at idle. It has a mixture solenoid but no TPS.
55
Diagnose a Quadrajet carburetor problem / Re: 17084223 float height
« Last post by Kenth on March 16, 2025, 12:47:47 AM »
Float clip in correct location and NOT in one of the holes on float arm?
New correct fuel inlet valve and NOT one of the disc style valves?
Correct nitrophyl float and NOT a brass float?
Fuel pressure 9 psi or below?


56
Quadrajet Carb Talk and Tips / Re: Carburetor build
« Last post by Photokinetics on March 15, 2025, 11:28:45 PM »
Cliff,
 I will find out what year the engine is and then write you for the rebuild components.
Thank you
Paul
57
Diagnose a Quadrajet carburetor problem / Re: 17084223 float height
« Last post by 77cruiser on March 15, 2025, 05:00:52 PM »
What's the fuel pressure?
58
Diagnose a Quadrajet carburetor problem / Re: 17084223 float height
« Last post by 65malibu on March 15, 2025, 03:22:56 PM »
Still having problems with this. I tried setting the float to 17/32" and cured 90% of the problem, but now I'm running out of fuel at higher RPMs. Anyone else got any ideas?
59
For Sale / Wanted / Re: Looking for a Quadrajet 7040268 for 1970 GTO 455HO 4-speed Convertible
« Last post by Kenth on March 14, 2025, 01:23:26 PM »
Nice car!
But if you want correct you´d be looking for a 7040267, 7040268 is for A/T.
60
For Sale / Wanted / Looking for a Quadrajet 7040268 for 1970 GTO 455HO 4-speed Convertible
« Last post by Rvolberg on March 14, 2025, 12:33:26 PM »
Hello - new forum member here. I am looking for a 7040268 for my 1970 GTO 455HO 4-speed. I just purchased the car and it has a numbers matching engine but the carb is an incorrect replacement unit. Hopefully someone out there has what I need!

thanks!
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