Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Poor Cold Running - Sputters, Backfires, Hesitates, Dies

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kuhnzoo:
OK. More info. Secondary rods = DP. Secondary hanger = L.

Also, primary and secondary throttle plates appear to close properly. There is a bit of light at the plate edges, but I would imagine this is typical since the plates and bores aren't going to conform to one another perfectly. Yes, No??

Rod to secondary has some play when throttle plates are closed.

Nothing hangs up on the fast idle cam.

So I made my plug for the APT access hole and I'm going to install the carb on the truck. Guess I'll see what happens. Hopefully I. can adjust the off idle hesitation away. No idea what to do about the high idle speed.

Thanks for replies/suggestions.

Rob

429bbf:
this might sound stupid but ive seen dummer stuff. is there any slack in the throttle cable when it is hooked up?you didnt say you were testing it with the cable unhooked .

kuhnzoo:
Sorry I left that detail out. yes, with the throttle cable disconnected the idle is still too high

Schurkey:

--- Quote from: kuhnzoo on November 22, 2013, 07:37:13 PM ---Sorry I left that detail out. yes, with the throttle cable disconnected the idle is still too high

--- End quote ---
Carb have idle air bypass?  If so, maybe the metering holes are too big.

kuhnzoo:
Not sure about the idle air bypass. When I had the airhorn section off, I look at the tubes, holes and other orifices to see if any looked to be modified (or damaged). Nothing looked to be modified or damage.

I am sure I am overlooking something, just don't know what it might be...

Snow is falling here. I need to get this truck up and running pronto. It is my snowplow rig!

Hope everyone has a very Happy Thanksgiving!

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