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Fuel Mixture/idling speed
I'm looking for help adjusting the fuel mixture and hopefully the idling
I have an 86 5ktqw.
The plug on the mixture adjustment screw is no longer there, and the screw
goes out of adjustment by itself. I can tell because the idling speed goes
up; when I check the screw, I can see it has moved (I had it marked). So
I turn it clockwise (tightening it) and I bring the idling down. I've been
playing this game for months, and I'm getting tired of it.
My questions are:
1. Is there a manual procedure to adjust the fuel/air mix? Haynes manual
is totally useless here, it tells you to take the car to the dealer.
2. Does anybody know of a way to stop the screw from moving? Do I have to
get a new plug from the dealer? I don't want to seal the screw until I
get the mixture right of course.
3. I've been thinking of buying an O2 gauge (bar graph). Would this help
adjusting the mixture? Do I have to wait for the gauge to make the
My fuel consumption has gone up substantially lately and I think its
related to my adjusting the screw blindly.
Any input would be appreciated.