*VIDEO FOR CONTEXT*
https://youtube.com/shorts/_tfHteLj38M?feature=share
Morning Y'all.
Hope everyone's weekend is off to a good start.
Mine is going good, but it would be better if I could get this truck to idle!
I think it's not getting enough fuel. I adjusted the floats to the recommended TSM setting for the 4BBL application (bottom of sight glass), but my fast idle does not seem to be on par with the 1600-1800 RPM recommended. Curb idle screw is set to expose a rough square in the transfer slot, and idle mixture screws are roughly 1-3/4 turns out. Fast idle screw is at factory settings.
I don't think I have any vacuum leaks, as I did the spray down test with starter fluid and there were no changes in RPM.
Do I need to adjust timing to account for the larger carb? When pressing the accelerator there is no throttle response, which leads me to believe either under-fueling or an issue with the ignition.
You can also hear it back firing a couple in times in the video, but this could be a fuel/air issue.
You can also hear it erratically pickup for a second and the idle events out.
This was originally a 2 BBL truck for context, but the TSM shows that there was an option for a 4BBL intake with a Holley 4160.
Carb is a Quick Fuel Technologies 425 CFM.
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1968 J3500 - 1985 CJ7 - 1998 Grand Cherokee 5.9 Liter Limited - 2006 Grand Cherokee Limited
Rhino USA Brand Success Manager
South East Offroad Activist