Need Help w/ 6.0 Turbo Tune

[GAMEOVER]

What would cause PCM to go straight to the Boost VE table when it's idling. Rich, Rich, Rich I can't figure it out, driving me crazy... At idle i'm getting 3.5-4.0 AFR and the data log shows the MAP sensor at 120 Kpa...:confused:
Custom OS 6.0ltr w/Turbo, 2 BAR map sensor, 46lb injectors

[L31Sleeper]

Check the voltage on the MAP with a digital volt meter

[GAMEOVER]

Maybe I didn't upgrade to the Custom OS the right way...Like I missed a step!
It's not going off of the Main VE table at idle for some reason!

[GAMEOVER]

Check the voltage on the MAP with a digital volt meter
I checked the MAP sensor and it's OK. I tried brand new one and still no go...

[L31Sleeper]

Well dude I believe you might be over thinking the situation.
A 2 bar sensor should have 1-1.5 V at 15 KPA and 4.5-5 V at 200 KPA

[L31Sleeper]

DID you tell the PCM you have a 2 bar sensor C6301 ?

[GAMEOVER]

Yes , Sir

[GAMEOVER]

I had this tune file on another PCM, and I Full Flashed it into this PCM without going thru the whole Custom OS procedure. I didn't put the PCM into "Dead Poll" and then flash the stock calibrations back in, but it did start right up though!

[5.7ute]

Got a tune file you can post up?
FWIW I have never gone through the dead poll mode when upgrading to a custom OS & have not had a single problem. I just full flash in the populated COS & go.

[5.7ute]

What kpa map does it show key on, engine off?
Are you using the 6.0 map sensor which I believe doesnt work with older PCM's?(might just be different pin outs)
If not what part number sensor are you using?

[GAMEOVER]

Gm pn# 12580698

[5.7ute]

Manifold pressure at key on engine off?

[GAMEOVER]

Manifold pressure at key on engine off is 100kPa

[5.7ute]

How does that compare to the old map sensor? If you are at or near sea level that sounds about right.
You may have to probe the map sensor voltage key on engine off and at idle to see what is going on. A mechanical vacuum boost guage can also be hooked up to compare to what the scan tool is seeing.
Obviously you should not be seeing boost at idle so there must be a wiring or COS issue somewhere. There was a problem with a COS that caused issues with scaling the 2/3 bar sensors a while ago that didnt reach a conclusion but that was a different problem.

[GAMEOVER]

Im about 50 miles from sea level. Would low fuel pressure cause those problems. The vacuum line from the regulator to the manifold was disconnected but after re-connecting it, no difference. I'll try probing the MAP sensor though...

[GAMEOVER]

I just checked the MAP sensor again. I connected alligator clips on the 5V reference wire and ground, with key on engine off it measure's 5 Volts.
With motor on & idling it still reads 5V's. Is that why it's going straight to the Boosted VE table on start up? How can i fix this? Would it be in the Tune or?

[5.7ute]

The middle pin, map signal, is the one you need to probe the voltage on.

[GAMEOVER]

I knew that...:doh2:
After I finished typing I was like dang it...:D

[GAMEOVER]

Key on ignition off it measures 5V
Key on ign ON and trying to idle it measure's 3.5-3.9 V's

[5.7ute]

Something is not right there. Key on engine off should be around 2.5 volts to give you 100kpa in the scan tool.
It is showing some similarity to the problem Howard at redline was having a while back.
What happens when you return the map scaler in the tunetool back to the stock 1 bar settings?

[GAMEOVER]

I'll try it...

[GAMEOVER]

Guess what man? That seems to have fixed it. At idle it shows 1.7-2.4 volts still a little rich but still... The re-scaling is affecting the Voltage.

[5.7ute]

So it starts & runs fine with the 1bar settings but a 2 bar sensor?

[GAMEOVER]

Yes, it starts, has a lopey idle & still a little rich and the Map voltage varies a little...
But what would be causing that? The tune? PCM? Custom OS?

[5.7ute]

I dont have a clue. Here is the previous time something like this was reported that didnt come to any conclusion. http://forum.efilive.com/showthread.php?t=1410&highlight=map+sensor+scaler
Might be worth sending a PM to Ross or Paul & see if they can chime in with a fix.
Before you do though. Probe the voltage key on engine off with a standard 1 bar sensor & your new 2 bar. There should be a substantial difference in the voltage signal to the pcm.

[GAMEOVER]

Man, now I'm thinking I don't have a 2BAR MAP sensor, a buddy of mine told me I had a BAP sensor and that's why output voltage is screwed up......:confused:

[joecar]

Do you have a vacuum hand pump and a DMM...?

[GAMEOVER]

I just checked the Supposedly...:bad: 2bar map sensor's(bought 2 of them) that I had picked up and there is no difference in voltage compared to a stock 6.0ltr map sensor, key on engine off all three MAP sensor's show 5V & 100kPa and with vacuum pump, pumped(or sucked :D) to 15in of vacuum, all three show 2.2Volts.
If it was truly a 2BAR map sensor at key on Igniton off wouldn't the voltage be 2-2.5 volts or so and at idle it would have to be somewhere around 1 volt like L31Sleeper says...

[5.7ute]

The sensor part number you are using has been used successfully many times.
Key on engine off the 1 bar sensor should read close to 5 volts, 2 bar around 2.5 volts. And yes around 1 volt at idle.

[GAMEOVER]

Finally got a 2Bar MAP sensor hooked up and motor turns on but will not idle! If I'm using a TH400 3 speed transmission, would I need to connect certain Pins on the PCM so that the PCM know's if it's in Park or Moving? Like pin 33 in the Blue connector?