quadrajet (Mercruiser 305): F-26
Posted: Mon Sep 24, 2018 7:20 pm
I want to check operation of the secondary throttle plate on my quadrajet carb. With the engine off, I plan to hold the air doors open to look down on the throttle plates — think the throttle should be in WOT position, and the transmission in gear.
Does that sound like a way to check? It’s my understanding that the secondary plate is mechanically connected to the primary plate, and they open together when the throttle is advanced. As the engine will be cold, the choke linkage will have to be tweaked in order to open the air doors (and obviously no mass air flow with the engine off).
If the secondaries aren’t fully opening, I’m going to check the remote cable connection to see if it needs to be relocated to fully pull the plate open — likely check operation of the carb linkage, and then reattach the remote cable at the appropriate spot.
Would welcome ideas….
Does that sound like a way to check? It’s my understanding that the secondary plate is mechanically connected to the primary plate, and they open together when the throttle is advanced. As the engine will be cold, the choke linkage will have to be tweaked in order to open the air doors (and obviously no mass air flow with the engine off).
If the secondaries aren’t fully opening, I’m going to check the remote cable connection to see if it needs to be relocated to fully pull the plate open — likely check operation of the carb linkage, and then reattach the remote cable at the appropriate spot.
Would welcome ideas….