Quote:
Originally Posted by Clay.0
I think we're talking about a few different things here. The TPS on the ITBS only measure throttle position, they are not an actuator to open and close the throttle.
Options for cold idle control:
1. Drive by wire setup, ECU controls throttle bodies via actuator to be cracked up during cold start - Most of us don't have this option with our ITB setups
2. Backdate' hand throttle - manually holding the ITB's open with additional linkage (in addition to the foot throttle linkage)
3. Idle control valve controlled by AEM/Megasquirt. This is basically creating a controlled vacuum leak to raise the idle without changing the throttle position or opening the throttle bodies.
4. Hold throttle open with foot pedal for 20-30 seconds until engine warms up and holds idle.
I'm in Houston and option 4 works well for me, cold starts aren't really an issue so i've never needed additional measures.
|
Gotchya. That clears the air. I’m leaning towards option 3 as we have some chilly fall days in WI. Is a sensor needed for this? Or can Megasquirt, the plan here, simply control that? EDIT..read above posts about the VR6 idle control valve
As for TPS, I’m gathering that this is the little black sensor with two torx screws on the ends of the ITB grouping? I noticed in some of your images Clay, that it looks like you have two installed? One in the rear on the ITBs covering cylinders 4-6, which looks like it’s the one that’s wired? And then an additional in the front, not wired, on the ITB grouping covering cylinders 1-3.