Proper Throttle body settings

bigalpha

Moderator

Location

Tucson, AZ

• Feb 17, 2011

• #1

So the PO to my MJ messed around a lot with the throttle body.

I have already set the butterfly valve properly (closed all the way then inched open until I could see a teensy weensy little space).

There is another allen screw on the side of the throttle body that is fairly small. What does it do and how is it set?

 

C

cruiser54

NAXJA Forum User

Location

Prescott, Az

• Feb 17, 2011

• #2

That's the idle air bleed. Joe Peters can tell what to do with it.

 

bigalpha

Moderator

Location

Tucson, AZ

• Feb 21, 2011

• #3

Joe, you around?

 

bigalpha

Moderator

Location

Tucson, AZ

• Feb 21, 2011

• #4

So I went out and fiddled with it some and didn't notice a difference in anything by screwing/unscrewing it. I did find that if I restart the truck after a high idle event, the idle will go back to 'normal'.

 

P

PaulJ

NAXJA Forum User

Location

Lynnwood, WA

• Feb 21, 2011

• #5

Block off the throttle body with your hand and adjust the screw on the side to achieve around 300-400 RPM. I would adjust the throttle stop screw by ear instead of sight. Back it off and screw it in to the point where you just hear a change in the intake airflow.

 

xjtrailrider

NAXJA Forum User

NAXJA Member

Location

Roanoke VA

• Feb 22, 2011

• #6

PaulJ said:

Block off the throttle body with your hand and adjust the screw on the side to achieve around 300-400 RPM. I would adjust the throttle stop screw by ear instead of sight. Back it off and screw it in to the point where you just hear a change in the intake airflow.

Click to expand...

Make sure you re-adjust your TPS if you move the throttle stop any from where it is now.