Quadrajet questions

[jonrpick]

My Q-Jet came stock on my '86 K5. It has one 2-pin electrical connection on the top.

1st off, can anyone tell me which Q-Jet this is? From what I'm reading, there was an O2 sensor on this year...

Where was this O2 sensor located? I haven't seen on on either of the exhaust manifolds. I do know that the distributor used the 5-pin module, which connected to the ESC module, and that the original 305 had a knock sensor in it.

Can this carb be used without any computer control?

 

[dyeager535]

If that's the only electrical connector, no it doesn't use an O2 sensor.

I've forgotten it's name already, it's essentially a temperature controlled accelerator pump as I recall.

To be honest, I have no idea how it would work without it hooked up. I don't know as I've ever seen a wiring diagram with that in it, though I do have an '86 diagram I could look for it. I suspect it's a 12V power wire, grounded through a switch in the thermostat housing.

 

[Blue85]

The only trucks to get electronic carbs (CCC) were the california ones. If it was electronic, there would also be a 3-wire throttle position sensor.

That funny 2-wire object is a solenoid inside the carb. It is powered through a temperature switch so that it is activated only when the engine is cold. It changes the acceleration enrichment circuit to increase the volume of the "pump shot". From what I understand, the shot of gas is supposed to be about twice as large as normal.

 

[jonrpick]

The only trucks to get electronic carbs (CCC) were the california ones. If it was electronic, there would also be a 3-wire throttle position sensor.

That funny 2-wire object is a solenoid inside the carb. It is powered through a temperature switch so that it is activated only when the engine is cold. It changes the acceleration enrichment circuit to increase the volume of the "pump shot". From what I understand, the shot of gas is supposed to be about twice as large as normal.

Interesting... Well, regardless, that carb needs a rebuild. I was thinking of replacing it. Which Q-Jet would be right for a 350, that uses an electric choke?

 

[roadnotca]

Interesting... Well, regardless, that carb needs a rebuild. I was thinking of replacing it. Which Q-Jet would be right for a 350, that uses an electric choke?

If you do decide to replace it, you might want to check JEG'S. They have a replacement carb. I installed one on my CA '85 Burb. It works, and I passed SMOG.

 

[jonrpick]

If you do decide to replace it, you might want to check JEG'S. They have a replacement carb. I installed one on my CA '85 Burb. It works, and I passed SMOG.

I'll do it... thanks.

BTW, are the Holley Q-Jet replacements any good? I've heard good things about the Edelbrocks, but they're no longer in production