Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

301t Won't idle

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canadian nascar:
Hi Cliff,

i had my 301t built 8.5 comp, 262comp cam, roller rocker vt. i am having trouble getting it to idle, it will for awhile in park the it dies off and won't idle in drive. the exhaust is very smelly

i called you, Cliff the other day and you told me that my ilde tubes and channels are to restictive. can i just remove, then drill them out? or should i buy them?

you told me to look at the upper end of ilde mod reicipe #2

also i bought #77 jets in it and it runs good, but was wondering if they are enough and maybe should try some bigger ones?

thanks kevin

canadian nascar:
the carb was rebuilt last year

thanks kevin

Cliff Ruggles:
The main jets have no effect on idle quality.

In most cases the idle tubes can be removed and re-used.  If not, we have new ones available.....Cliff

canadian nascar:
thanks for your help Cliff,

will do some disecting this week. i now understand if i do need mure fuel to use the APT screw during part thottle instead of changing jets.

kevin

Cliff Ruggles:
Correct, the APT screw raises the height of the metering rods.  This only increases fuel delivery at part throttle/high vacuum.  Fuel delivery at heavy/full throttle remains the same....Cliff

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