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high idle problems

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Old Sep 29, 2010 | 08:26 PM
  #1  
87firebird305V8's Avatar
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Car: 87 firebird
Engine: carbed 305
high idle problems

okay im trying to get my car drivable and being a poor college student i dont have a lot of money. my stock quadra jet needs a major overhaul. so i put a older quadra jet from a 350 i bought a while ago but it doesnt have places to hook up any wires. so i have a wire holding the choke open for now. but even when its wide open the engine is revving extremly high. and the idle screw is all the way back. so what can i do. im thinking about turning the distributor right(pretty sure thats retarding it) to slow it down, will that work
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Old Sep 30, 2010 | 11:15 AM
  #2  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It will never work properly, because you need an older type distributor as well.

Your high idle is probably the high idle cam, on the opposite side of the carb from the idle speed screw, not dropping down like it should. It is a green colored weight-looking thing. It should be all the way down. I suspect in the choke wired-open you did it was wired it the up position.

What type of choke does your older carb have? If electric, the same wire from your CC carb should work. If "hot air", you can put the electric thermostat from you CC carb on it.

But, the real question: What is wrong with your CC carb that you think it needs a "major overhaul"? Most likely it would take less work and $'s to fix it than it would to get this bastard carb to work properly.
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Old Sep 30, 2010 | 09:52 PM
  #3  
87firebird305V8's Avatar
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Car: 87 firebird
Engine: carbed 305
Re: high idle problems

the person that owned it b4 must have had it sitting outside or something. everything inside is rusted out and pieces are missing. just wont work. i do have a hei distributor, will that fix my problems
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Old Oct 3, 2010 | 05:31 PM
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From: Carrollton Texas.
Car: 1985 Camaro Z28
Engine: 305 mild build up
Transmission: 700r4
Axle/Gears: Stock
Re: high idle problems

If that carb is rusted out and pieces are missing, I would go on craigs list and look local for one.They can be had kinda cheap Because no amount of work will make it run right short of a massive rebuild and all the missing parts found and replaced. Is it a computer controled carb? or was it changed to a non computer carb? And no do not set the timing to lower the idle. That is the totaly wrong way to fix it. And will do more harm than good.And yes you may have the fast idle wired open with your choke. If you have a non computer q jet on it now, I will sell you a running non cc qjet for 40 dollars plus shipping to were ever you are. I know it works because it is on my car now and working/running, but I am putting a holley on it this week early like no later than tuesday-wendsday. Just PM me and I will tell you about it and get you some photos of it if you want it.
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