March 6, 200521 yr 1984 Subaru DL wagon All original (as far as I can tell) I am currently trying to adjust my carberator and can not find the fuel flow adjust screw. I dissconnected all the vaccum lines and cleaned the carb body up a bit (this is a dirty, dirty engine ) and the only adjustment screw i found was the on the throttle body. I have posted a picture of the carb, and the red arrow is the throttle adjust. If anyone knows where the thing is, I would be very happy. I am currently out in the shop and checking back every 10-20 minutes, so reply may take a bit. Scott.
March 6, 200521 yr here It's hidden down in the throttle base casting. There maybe a pin in the way but it can be cut or drilled out.
March 6, 200521 yr Craig....my 1.8 had the pin drilled out...and after almost a yr my carb is running too dam rich...my MPG is about 12...how do you adjust that screw pin to back it off....sparkster.....
March 6, 200521 yr The pin is more like a roll pin. It can be driven out(down) with a small diameter punch, or even an old drill bit(upside down so the bit doesn't bite into the metal). I had to loosen the carb and raise it off the manifold like an inch and a half. Just pull the carb forward a bit so the pin will not fall into the manifold! I successfully adjusted my screw out to araound 3 1/2 turns and it increased my mileage, and ran a ton better. Of course, it was running too rich before all this.
March 7, 200521 yr That would be to the right (clock wise) It may not need to got that far in, turn it until the engine begins to run a bit rough then turn the screw back until is smooths out. Since you said you're only getting around 12mpg, changing the idle mixture may not help a whole lot.
March 7, 200521 yr my idle is at 1k rpm is that normal.....or should it idle less....thanks for your info craig
March 7, 200521 yr I set mine at 3 1/2 turns out. That's were it runs best. The POS is very worn, the throttle shaft is worn, the linkage is worn, I really can't get it right, it's just as good as it's going to get. Turn it in slowly, counting the turns, but do not tighten it down hard. Just turn it easily untill it stops, then back it out. Some say 2 1/2 turns. some say 1 1/2, but it really comes down to your carb. How worn out it is, how dirty it is, the altitude, etc, etc. As stated before, turn it out untill it runs smooth, which will increase the engine speed, then re-adjust your idle speed with the idle screw, the one on the left on the linkage.
March 7, 200521 yr Author Thanks all. found it and got it finished before the sun went down. Checked my milage and I am getting 33 MPG on the highway. No tach so I have no idea my RPM at the time.
March 8, 200521 yr Author I adjusted the carb by sound, so I backed it off till it allmost died, then turned it till it started running smooth. All in all I would say about 2 3/4 turns.
August 24, 200520 yr Ok so you turn it to the right till it stops? And then turn it to the left a few turns till it runs smooth? And then adjust the left screw, the idle screw? Thanks.
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