air/fuel mixture screw setting
10-31-2008, 01:26 PM
#1
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
air/fuel mixture screw setting
I was told that part of my rough idle problem may have to do with the air/fuel mixture screw on top of the throttle body. Mine is sitting just a hair above being flush with the casing. I've had 2 different people tell me that they have never seen one screwed out that far. they say it is usually about 1/8" down inside the casing. Is there a certain number of turns out that these are usually set to?
10-31-2008, 02:01 PM
#3
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
really? i was told it does more than that. Its idling very high right now. I just hooked up my new dash with tach but havn't ran it yet to see the actual rpm's yet. so that controlls the idle and not the stop screw on the side of the tb?
10-31-2008, 02:07 PM
#4
Registered User
Join Date: Feb 2008
Location: Oregon
Posts: 254
Likes: 0
Received 0 Likes
on
0 Posts
yeah the thing on the side is for the dash pot to bring the motor down slower from a high rev. Turn your idle screw down and if your motor is stock it should be around 750rpm and see if that helps!
10-31-2008, 04:05 PM
#5
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
the set screw on the throttle linkage is only used to set the initial throttle plate position. it's adjustment also can affect the throttle position sensor.
the screw on the dashpost is to set the amount of dampening the dashpot puts on the throttle during deceleration to prevent backfiring and other issues.
the screw on top of the throttle body only allows air to bypass the throttle plates thus controlling the idle speed.
the screw on the dashpost is to set the amount of dampening the dashpot puts on the throttle during deceleration to prevent backfiring and other issues.
the screw on top of the throttle body only allows air to bypass the throttle plates thus controlling the idle speed.
Last edited by abecedarian; 10-31-2008 at 04:06 PM.
10-31-2008, 06:22 PM
#6
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
thanks. I've learned so much these past few days from this site. Maybe one day i'll understand what that little Japaneese guy was thinking when he was designing these things.
why cant all vehichles be designed like Jeeps? Uh oh, might have just said too much...
why cant all vehichles be designed like Jeeps? Uh oh, might have just said too much...
Trending Topics
10-31-2008, 06:54 PM
#9
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
easy now... you guys should have known i was a jeep guy by reading my screen name....XJ...
Thats alright, i actually own more yotas than jeeps right now. And they both ride down the road better than the jeep.
Thats actually why i bought my 89 last week, to quit driving a lifted cherokee on 35's and locked f/r; on the road everyday. Not to mention the fuel savings
Thats alright, i actually own more yotas than jeeps right now. And they both ride down the road better than the jeep.
Thats actually why i bought my 89 last week, to quit driving a lifted cherokee on 35's and locked f/r; on the road everyday. Not to mention the fuel savings
11-01-2008, 07:56 PM
#10
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
well, once i got my tps set right i tried screwing with the idle screw. I had to screw it all the way in to get my idle around 900 Is this normal? Should there be anything under the screw like a spring or something? There wasn't anything under it but looked like a spring should go in there.
11-01-2008, 08:00 PM
#11
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
the idle screw on the throttle body is similar to a needle valve. it just protrudes into a passage to restrict the airflow the more it's screwed in. no spring, but I believe there's an o-ring that goes around it.
and is that speed with the engine warmed up or cold?
did you re-do the timing?
and is that speed with the engine warmed up or cold?
did you re-do the timing?
Last edited by abecedarian; 11-01-2008 at 08:01 PM.
11-02-2008, 04:01 PM
#16
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
the timing was real high. I set it to 5deg. with the diagnostic ports jumped and with it unplugged it is at 12. Thats right about what the write up i read said. seems to be running smoother now. I still have the idle screw all the way in to keep a nice idle.
11-02-2008, 04:11 PM
#17
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
I have not come across a 22re that requires the idle screw to be all the way in. Maybe a previous owner has adjusted either the throttle plate stop screw or dashpot to hold the throttle open, thinking either was the idle speed adjuster?
11-02-2008, 06:34 PM
#18
Registered User
Thread Starter
Join Date: Oct 2008
Location: Belmont, NC
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
I'm just glad the sputter is gone.
Thread
Thread Starter
Forum
Replies
Last Post
crammit442
95.5-2004 Tacomas & 96-2002 4Runners
7
11-29-2017 12:30 PM
