General Category > Quadrajet Carb Talk and Tips

Lean idle and Exhaust popping

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TylerG:
Busy weekend but got the bypass opened up to .092” and idle mix opened up to .091” late last night. Reinstalled this morning, mix screws turned out 2 turns. I only had time for a quick test drive to get it up to temp and it was def running smoother. I have full control of idle mix now and I was able to get the idle down to 750. I noticed last night when I had it apart that the primaries were cracked a bit far so wondering if that was causing the high rpm Jim!? Hoping to have a bit of time tomorrow night to get back into this and get it dialed in better now that I’ve got the lean idle under control.

77cruiser:
Fast idle cam could have been hung up I suppose. Sounds like you're getting a handle on it.

Too Fast:
Way back in the day I had a 1972 Chevy van G20 with a 350 and a manual transmission 3 on the tree.  I ran dual exhaust on it with some long glass packs.  It had a lot of over-run popping thru the exhaust.  Think like 4000 RPM, let off the gas in 2nd gear.  Sounded almost cool, but my memory may be a bit foggy.  Anyway, I added a balance pipe to the exhaust (H-pipe, I worked and an exhaust shop at the time) before the glass packs and that eliminated about 75% of the over-run popping.

IDK if that is part of what you are experiencing.  I had no headers, just 2" dual exhaust.

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