General Category > Quadrajet Carb Talk and Tips

Hesitation when taking off

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Cliff Ruggles:
You simply need more fuel to the idle system.  This will also put more fuel to the off idle transfer slots and cure your issues. 

Pretty sure that was mentioned earlier at least once.

It could be as simple as effectively cleaning the idle tubes as they tend to get smaller over the years as "varnish" builds up in them with many drying up cycles.

Here I remove them from the main casting and manually clean them with precision drill bits.  For this new fuel I open them up in almost all cases and to date have never had a single complaint from the end user and I'm well over 15,000 units at this point........Cliff

Kavesh:
Yes you are quite right it has been mentioned before about fuel delivery at idle.

I have removed the idle tubes and used wire to ensure the tubes are clear. I do not have the precision drill bits to be precise on this.

I must say though that the idle tubes were not blocked nor was there any muck in the main body. This is what has me stumped.

I am hoping a fresh set of eyes in my buddy would see what the issue is and sort it for me. Perhaps I have been looking at it for too long now.

I will post an update in due course.

Kenth:
There is no way around enlarging the idle tubes and idle down channels.
Now is the time to get a set of precision drill bits.

Kavesh:
What will the impact of the plastic retainer for the power piston be when its installed upside down.

My mate said that he noticed this installed incorrectly. See pic attached.

I have had this in the carb for probably 2 years of longer with no known problems, until the carb issues I am experiencing now.

Will the power piston collar have any effect on the carb when installed upside down?

Thanks

Kenth:
No real ill effects. Obviously the power piston will not rise the full distance with the retainer upside down but the taper on rod should still leave the jet enough at WOT or heavy load manouvers.

And, this has NO effect on idle and off-idle issues.

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