Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Warm idle fluctuation with slight backfire [VIDEO]
turboguard:
--- Quote from: Jeffs68 on January 21, 2017, 11:01:34 AM ---Sounds pretty normal to me for an 85 T/A. The only thing I would do is get rid of those "novelty" NGK plugs and put a set of A/C Delcos in.
Double check your timing as well.
--- End quote ---
The V-Powers aren't really a "novelty" compared to other plugs out there, literally just a regular copper core plug with the V-tip which supposedly helps burn (couldn't hurt either way). Plug gap is at 0.35
My timing was 8 degrees advanced with the ECM disconnected.
turboguard:
So I'm starting to think my idle problem has to do with the fact my airhorn has no rich stop screw. I've adjusted everything the best I can and it runs pretty good while in drive, but in park or neutral the idle is still very rough.
Would you be able to sell me the appropriate airhorn for my quadrajet? Or would it be possible for me to drill in a place for the rich stop screw myself?
Cliff Ruggles:
Can you provide a picture of what you are talking about (rich stop screw) and where it is missing on your carburetor?
turboguard:
--- Quote from: Cliff Ruggles on January 27, 2017, 02:01:51 AM ---Can you provide a picture of what you are talking about (rich stop screw) and where it is missing on your carburetor?
--- End quote ---
Sure, I'll pop the airhorn off when I get home this evening and post up some pics of everything.
turboguard:
Pics of the airhorn:
Close-up of where the rich stop screw should be if this were the correct airhorn:
The carb number:
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