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Old 11-08-2010, 10:52 PM
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1980s Q jet mix solenoid

Q jet electric mixture valve?

on the 1980 up Q jets(this one is a 1985 4.3L one without a TPS) there is the electric solenoid mix valve thing on the pass side front. how can i test it with a multi tester to see if its still operable, or how can i know if it is?

i completely tore down this carb and found alot of fine orange silt in it

i cleaned it all out real good, and all jets and passages too, and never found anything else wrong with it, not even a loose tube etc.

it is white colored top one, and doesnt have the thin connection and extra piece below it like the blue colored top ones on the E4ME carbs that have a TPS in them(ESC/EST ones)

also someone previously chopped the caps off the idle air mix screws in the base plate

i unscrewed them out to clean out the passages there too

i set them to 2.5 turns out from fully seated

is that good for now?

thanks for anything

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Old 11-09-2010, 12:25 PM
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Quote:
Originally Posted by fast68
Q jet electric mixture valve?

on the 1980 up Q jets(this one is a 1985 4.3L one without a TPS) there is the electric solenoid mix valve thing on the pass side front. how can i test it with a multi tester to see if its still operable, or how can i know if it is?
That is NOT a mixture control solenoid. It is a two-position solenoid valve for the variable displacement accelerator pump. All it does is open or close to change the large pump shot (when the engine is cold) to the small pump shot for normal driving. Simply apply power to the two wires and if it's working you will feel/hear it click. Note that other than when the engine is cold, this solenoid does NOTHING. It is not for mixture control like the pulsed solenoid on the CCC carbs.
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