TBW Idle control ?
04-03-2006, 12:00 PM
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TBW Idle control ?
I have a 2005 GMC Sierra 5.3 ,A4 ,with electronic throttle.
My target idle speed is set at 600rpm,
Sometimes when idling at a stop for more than a couple of minutes
My TPS will climb from 9% to 13% and the idle will go up to 730rpm.
What tables could be affecting this or controlling this it’s rather annoying.
Has anybody seen this before?
My target idle speed is set at 600rpm,
Sometimes when idling at a stop for more than a couple of minutes
My TPS will climb from 9% to 13% and the idle will go up to 730rpm.
What tables could be affecting this or controlling this it’s rather annoying.
Has anybody seen this before?
04-03-2006, 03:12 PM
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One thing i've noticed that doesnt like any modified throttles and other parts on the intake track is the "Throttle Follower"
I've just disabled it totally, and i have for all intensive purposes total control over the throttle. I was having problems getting the engine to idle smoothly with my ported tb, and turning that off helped alot.
Also, reprogramming your Running Airflow Tables to be more accurate helps too. Less searching for the right idle trims to keep the same RPM's.
I've just disabled it totally, and i have for all intensive purposes total control over the throttle. I was having problems getting the engine to idle smoothly with my ported tb, and turning that off helped alot.
Also, reprogramming your Running Airflow Tables to be more accurate helps too. Less searching for the right idle trims to keep the same RPM's.
04-14-2006, 01:56 PM
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Well I just thought I found the problem, But its back doing the same thing.
I've monitored all the different air flows and somthing is addind airflow to the
Base sum airflow, I think its either the A/C or some sort of airflow adder for
the Battery Voltage or Alternator.
I'm going to start by reducing the Max Airflow adder A/C on, and see if that changes anything.
Anybody have any Idea's.
I've monitored all the different air flows and somthing is addind airflow to the
Base sum airflow, I think its either the A/C or some sort of airflow adder for
the Battery Voltage or Alternator.
I'm going to start by reducing the Max Airflow adder A/C on, and see if that changes anything.
Anybody have any Idea's.
04-14-2006, 08:23 PM
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Just got back in from doing some checks.
The A/C does add airflow to the base, but there is somthing eles adding airflow with A/C on and coolant temp, any time the coolant temp is at
185 F or above and the A/C is on the ETC goes up 4% and the idle goes
up 130 rpm.
My Target Idle tables in gear, P/N, A/C on, A/C off , from 154 F up are set at
600rpm.
So there must be a airflow adder somewhere in the code for this, maybe it has something to do with Alternator current or load or system VDC.
My 2001 cable driven TB doesn't do this it just seems to be the ETC (DBW)
systems.
anybody have any thoughts on this.
The A/C does add airflow to the base, but there is somthing eles adding airflow with A/C on and coolant temp, any time the coolant temp is at
185 F or above and the A/C is on the ETC goes up 4% and the idle goes
up 130 rpm.
My Target Idle tables in gear, P/N, A/C on, A/C off , from 154 F up are set at
600rpm.
So there must be a airflow adder somewhere in the code for this, maybe it has something to do with Alternator current or load or system VDC.
My 2001 cable driven TB doesn't do this it just seems to be the ETC (DBW)
systems.
anybody have any thoughts on this.
04-15-2006, 01:02 AM
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In the Torque Management tab, under Engine Torque, there is a large section totally devoted to the Airconditioner Compressor and how it effects accessory train torque requirements.
To be honest i've never messed with anything on that whole page. The only thing i ever did AC related, was enable the 'AC Bump Tq Idle Spark' to help with the RPM snag when the compressor cycles (also because of my 1-fan kicks on high).
To be honest i've never messed with anything on that whole page. The only thing i ever did AC related, was enable the 'AC Bump Tq Idle Spark' to help with the RPM snag when the compressor cycles (also because of my 1-fan kicks on high).
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04-18-2006, 08:51 AM
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Originally Posted by Rammer
The 2005+ trucks also have a different charging system. The system will turn the alternator off when not needed and back on when it needs more power. My voltage gauge will read from 12 to 14+ volts at any given time, unlike my 02 I had, that stayed near 15 volts all the time. This is one of the changes made for the 1MPG EPA increase over prior years.
I would much rather have a constant voltage than this fluctuating one.
I noticed if the Volt gauge drops to 12.5vdc for more than a minute or so at Idle that the VCM then adds AirFlow to the Idle Base Airflow which picks up
the Idle 130+ rpm and I see the TPS increase 4% to 5%, this is very annoying, I really would like control of this.
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