If you previously had CMP Retard, then the GM enhanced PIDs are installed in your Dash Command.

From Gauges Screen........ to make a gauge add gauge/digital LCD PID/name/general - then you should find GM.ENGINE.TPS. Select and back up one and lower 7000 max to maybe 60° and save.

From Data Grid....... PIDs/add PIDs/general - then you should find GM.ENGINE.TPS. select it and now that PID should be displayed in the main Data Grid Screen

Actually I see that it reads out in throttle angle instead of TPS voltage - but same difference - different scale.

 

Okay thanks, got it.
I wish I knew a little more about these scanners and how to use them.
Later Les

 

Hey we're all learning things about them. What works and what doesn't in what software on what vehicle. Any questions just ask and I'll do my best to give you a good answer.

For the TPS, you're just looking for smooth transition of throttle angle throughout the full range of your gas pedal, all the time. Also should come back to same value at idle each time and be same at full throttle each time. You can note if throttle angle goes goofy when you feel your problem, since you said that you set a TPS code some time ago. Scanner is great for this, as it displays what the PCM is actually seeing for whatever reason.

TPS problems can definitely affect IAC operation as IAC position partially depends on where your throttle position is at the moment. IAC goes open when throttle is not closed and TPS tells the PCM when the IAC needs to control idle speed.

Or maybe you don't have a TPS problem anymore after you replaced it. Hard for me to tell from where I'm sitting!

But I really doubt if IAC is causing a problem going down the road. I suppose one could justify a scenario where the IAC surges and hunts when going down the road but I think that is pretty unlikely. If so, that would probably be a TPS problem in any case.

I really wonder if you are not feeling the TCC. Vehicle speed (40mph) is a little low, but variation in RPM (200-300 RPM) is right. Mid 40's MPH would be more likely.

 

Alrighty then.
Thanks Again

 

Okay, ground is good on the tps and I have a solid 5 volts on the Grey wire. Blue wire began at .5 and went up to 4.35 with no eratic movements or jumps

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One more question. If I have excessive play in my distributor, wouldn't my "cmp" retard reading be all over the place? Because it stays around +1 to +1.5 most of the time.
Probably should get that a little closer though...

 

I would think CMP retard would be off if distributor is in it's original position but who knows if it would vary. +1 to +1.5 should be fine.