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View Full Version : adjusting a/f screw



staticpat
08-10-2002, 09:28 AM
man my plugs are running lean, and i read the faqs on adjusting the air/fuel mixture, but cant find the screw for the life of me. you are supposed to be able to adjust it without disconnecting hoses and stuff right? or are there different model carbureators with the screws in different places? i spent 20 minutes turning a screwdriver in an empty hole till i got a mirror behhind there and realized there wasnt a damn screw!

A20A1
08-10-2002, 10:24 AM
there is a screw but it's protected by a metal cap... the cap can only be removed when the carb is removed

staticpat
08-10-2002, 11:01 AM
so i have to totally remove the carb, then put it back in to adjust the fuel? dadgummit!

ACCORD EX
08-10-2002, 01:12 PM
try using a small screw driver to pru it out ! nothing else i can think off ! :( mine is missing since i bought the car ! :D

MIKE

shepherd79
08-11-2002, 03:02 AM
take the carb out and remove that cap. and putt it back.
the question i have is which way to i have to turn to make it rich.
Screwing IN - reach or lean?
i think it makes rich mixture. i am not sure.
i was messing with with thing yesterday and i think i got to right spot. my car is idling like it never did. smooth without any problems.

ACCORD EX
08-11-2002, 03:51 AM
i really don't recommend taking the carb out !
anyway
clockwise = rich = more gas
counter clockwise = lean = more air

to adjust it propably , you need to do it when the car is fully warmed up , then keep on turning it until you get the highest idle possible ! then adjust the idle with the idle stop screw !

BTW if you don't have hesitation problems and idle problems don't mess with it and ofcourse don't take the carb off for that !

MIKE

A20A1
08-12-2002, 04:50 PM
I'm sorry mike but you've got it backwards

the idle air/fuel mixture screw is a needle valve... if you turn it counter clockwise you will add more fuel and richen the mixture, since the needle is moving out, the passage way for the fuel is increased.

shepherd79
08-12-2002, 06:04 PM
ok so when i am screwing the niddle i am leaning out is that right?
if i am screwing out the nidle i am making the mixture rich right?
that is what i thought too. opening the passage to allow more fuel makes more sense.

A20A1
08-12-2002, 06:28 PM
yes yes

ACCORD EX
08-13-2002, 02:35 PM
Originally posted by A20A1
I'm sorry mike but you've got it backwards

the idle air/fuel mixture screw is a needle valve... if you turn it counter clockwise you will add more fuel and richen the mixture, since the needle is moving out, the passage way for the fuel is increased.

i'll be damned !!!!!! :banghead: :banghead: :banghead:

i always thought it was the other way ! :banghead:


thanx mike :)

MIKE

shepherd79
08-13-2002, 04:45 PM
ok now i am confused. when i try to reachen the system my sparkplugs turn white as the snow. so i looked at the book and it says that if spark plug is white the mixture is lean.
So now i am confused.
I hate Keihin. I think i am gonna get dynomite and blow one up.

A20A1
08-13-2002, 05:09 PM
are you sure you turning the srew out... only do it 1/2 turn

A20A1
08-13-2002, 05:16 PM
wait a sec... you probrably have dirt in the carb and its clogging the valve.

and never force the needle in or you'll damage the valve.

ACCORD EX
08-13-2002, 11:53 PM
what do you mean by never forc the needle ! ?
how would you screw it in ! ???

damn this a/f screw !!!

MIKE

shepherd79
08-14-2002, 03:47 AM
i am gonna take it out and clean it.
i don't have to take the carb out. i took out that stupid plug long time ago.
well, i will post on how thing as later.

ACCORD EX
08-15-2002, 03:15 PM
today iwas adjusting it ! it took the shit outa of me ! :(

MIKE

shepherd79
08-15-2002, 05:29 PM
well, i was playing with it today and i tried the trick Accord Ex told everyone on adjusting. i just unscrewed all the way out and found the spot where RPMs are the highest (went up by 400 max) and i just stoped right before it started to drop. i don't feel the diff. but i am sure have a big hose dive at full throttle below 3K in 3rd gear.
i am just gonna crank it up. i spin tires good. i left about 25 feet of rubber on the street the other day. i will post a picture of it some other day.

POS carb
08-15-2002, 11:03 PM
white plugs can also mean you're burning coolant

shepherd79
08-16-2002, 03:45 AM
and yes i do burn coolant. thank you. now that may explain why there are white. oh well. one more year before engine swap.

ACCORD EX
08-16-2002, 12:26 PM
feels nice the trick worked !:D

MIKE

staticpat
08-16-2002, 08:44 PM
does anyone have a pic of the screw with that cover on it, so i know what im looking for, so i can pry it off without removing the carb?

ACCORD EX
08-17-2002, 12:22 PM
why do you want to adjust it !? hesitation ? bad gas milage ? bad starts ??

MIKE

staticpat
08-18-2002, 08:08 PM
lean spark plugs and bad starts, but i think im gonna adjust my timing first now that im thinking about it.

ACCORD EX
08-19-2002, 02:44 PM
lean spark plugs isn't always an A/F problem ! but bad starts ! :rolleyes:

MIKE

staticpat
08-19-2002, 02:59 PM
well my starts arent that bad anymore, now that im thinking about it. thanks for your help.