Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[panhead1]

Hooked the laptop up to the bike today to check some stuff on an 09 street glide with 58mm throttle body.  I noticed the the tps was at 6% at idle with twist grip sensor at 0%.  It has alot of work done to the motor.  Could be a dumb question but is there any reason the the tps should be set there instead of 0% also?  Also how is it you adjust this to 0?  Was just trying to get everything tuned up and ready for the spring rides. 

[krypto2011]

If tps was at zero, engine would not get any air and therefore  would not idle. Pcm uses throttle body to control idle speed. Perfectly normal.

[panhead1]

I kinda thought that.  Just assumed with motor not running it would be at 0 not at 6.  I guess there is just a screw back there to adjust the throttle blades and thats how its set?  Figured that was weird that your twist control and actual throttle control are always 6% off then. 

[98fxstc]

tps should be at 0% at idle
IAC controls air flow at zero throttle opening
A good post on v-twinforum by HDWrench (Steve at GMR)  some years ago about adjustment
also some posts on HTT
Will likely need to adjust TPS volts , adjust TPS sensor and throttle stop screw
Good idea to do a bit of reading to get your head around it

[krypto2011]

tps should be at 0% at idle
IAC controls air flow at zero throttle opening
A good post on v-twinforum by HDWrench (Steve at GMR)  some years ago about adjustment
also some posts on HTT
Will likely need to adjust TPS volts , adjust TPS sensor and throttle stop screw
Good idea to do a bit of reading to get your head around it

Depending on model year this is true, however late model throttle by wire throttle bodies do not have IAC valves or motors. Idle is controlled by throttle body motor opening throttle blade to allow air into engine for idle speed.

[panhead1]

I have tried to search everywhere for posts on this.  No one ever really says what your non running tps should be set at.  Just some stuff about moving the screw in or out to change your iac steps.  Most say yout tps voltage shold be somewhere around .5v.  Mine is at .76.  But couldn't find anything on how you actually adjust it.  Only how to check you tps.  my bike is an 09 by the way if that makes any difference.

[98fxstc]

Don't think the 58mm TB was stock on the 09 street glide
Is it cable or FBW ?

[hrdtail78]

There is no mechanical adjustment for your TB that should be adjusted.  This needs to be taken care of in the calibration.  What you are seeing is the IAC steps being added to the TB.  Cold idle is around 5-6% and when it heats up you should see lower.  To make the TGS and TPS read the same would be taken out the IAC steps.  They are needed.

The IAC will learn.  It uses the target RPM/ AFR and adjusts the amount it is open to achieve this.  Colder engines need more air and fuel.  Target idle might be 1160rpm on an engine that is 90f and 1000rpm over 176f.

What you are seeing is perfectly normal.

[Ed Ramberger - One_Screamin_Eagle]

Hooked the laptop up to the bike today to check some stuff on an 09 street glide with 58mm throttle body.  I noticed the the tps was at 6% at idle with twist grip sensor at 0%.  It has alot of work done to the motor.  Could be a dumb question but is there any reason the the tps should be set there instead of 0% also?  Also how is it you adjust this to 0?  Was just trying to get everything tuned up and ready for the spring rides.

ETC throttle bodies run about 5% at idle so 6% is nothing to worry about.  This also gives them the ability to drop RPM below idle if necessary such as in a heat management condition or an intake leak.

A MM throttle body uses a stepper motor and also shows TP open at idle.  A Delphi throttle body uses an IAC and that shows 0% at idle with the IAC typically in the 40 step range give or take.

[Ed Ramberger - One_Screamin_Eagle]

Hooked the laptop up to the bike today to check some stuff on an 09 street glide with 58mm throttle body.  I noticed the the tps was at 6% at idle with twist grip sensor at 0%.  It has alot of work done to the motor.  Could be a dumb question but is there any reason the the tps should be set there instead of 0% also?  Also how is it you adjust this to 0?  Was just trying to get everything tuned up and ready for the spring rides.

ETC throttle bodies run about 5% at idle so 6% is nothing to worry about.  This also giveos them the ability to drop RPM below idle if necessary such as in a heat management condition or an intake leak.

A MM throttle body uses a stepper motor and uses the throttle plates to control idle.

A Delphi cable throttle body uses an IAC and that shows 0% at idle.