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Old 05-04-2008, 03:10 PM   #1 (permalink)
Pillow
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SOS - setting tdc offset with AutoEnginuity scanner

Okay I tried to do the TDC offset learn with the AutoEnginuity Scantool...

I set TDC learn on... I could not figure out how to input the desirred -1.94 so it just ran... now it sounds horrible and smokes like a chimney!

Help!

I just cannot figure how to enter a variable to set it to?

Thanks!

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Old 05-04-2008, 03:40 PM   #2 (permalink)
Pillow
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This is from Turbine Doc, but for the MT2500:

"MT2500 will display TDC offset but will not command the learn of it, that requires stored codes cleared from memory, engine greater than 170F water temp, and KO/KO with APP to floor to initiate the learn."

Granted I thunk with the ScanTool you could adjust on the fly?

... Everyone says search... and I did... And I am still lost.

There seems to be a debate over turning the IP versus programming the IP offset with a scanner.

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Old 05-04-2008, 03:41 PM   #3 (permalink)
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FWIW I started at 2.20, started rough but was quiet as a kitten.

... Now I have no idea where I am.
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Old 05-04-2008, 04:29 PM   #4 (permalink)
Brooklyn tow
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As far as i know, from what i've read.......you need to actually move the pump, I could be wrong but do a search look for something posted by GMCTD, I think that's were I read it.

Louis
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Old 05-04-2008, 04:41 PM   #5 (permalink)
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Wich version of AE are you using? How did you proceed?
Did you clear all codes before performing TDC relearn? With this scanner, you can do a TDC relearn at any temp, but I suggest you do it after your engine is warm enough.
TDCOfsett at 2.20 is out of specs, you must rotate to driver side to go back to -.070 average.
With my reflashed ECM I have set it at -1.56.
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Old 05-04-2008, 04:43 PM   #6 (permalink)
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You can't adjust on the fly, you must move the pump.
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Old 05-04-2008, 04:53 PM   #7 (permalink)
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Old 05-04-2008, 08:11 PM   #8 (permalink)
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Sorry guys, I'm in Borneo, limited connections & on line time, yes IP needs to be moved, ECT>170F & no codes stored, or learn won't happen, have never used AE tool, but I thought it had command learn capability, like tech 2, MT2500 does not requires AAP to floor to command learns.
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Old 05-04-2008, 08:55 PM   #9 (permalink)
Pillow
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Okay, I think I have it.

IP moves left or right. Left in this case. Really the IP position dictates the TDC offset.

Use the ScanTool to update on the fly. Saving the KOKO App process..?

Again use the ScanTool to see where the TDC offset at the end.


For some reason I thought the IP timing (3.5 degree?) and TDC offset were semi independant of each other. I guess the stepper does all the work in relation to the two parameters.

I will try her again tomorrow night and post back the results. Right now the tranny pan is out getting the temp sensor installed... Found a few metal shavings on the magnet, doh! But she is still smooth as butter. knock on wood.

Thanks!
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2 - 6.2 motors getting the treatment for a '71 swap.
'71 Chevy C-10 350 w T-5 manual
'79 Porsche 911 SC
'05 Cadillac CTS-V
'49 Spartan Mansion 30' travel trailer
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Old 05-04-2008, 09:57 PM   #10 (permalink)
Pillow
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Just to make it more interesting:

"Stepper motor does not return positional feedback, and cannot locate a 'middle' position. stepper is bottomed to full retard position during offset learn, which is why some trucks will stall, advance is too slow to maintain operation."

Or smoke like hell which is what mine did.

Everything to confuse about TDC offset by GMCTD:
https://www.dieselplace.com/forum/showthread.php?t=17992

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2 - 6.2 motors getting the treatment for a '71 swap.
'71 Chevy C-10 350 w T-5 manual
'79 Porsche 911 SC
'05 Cadillac CTS-V
'49 Spartan Mansion 30' travel trailer

Last edited by Pillow; 05-04-2008 at 09:57 PM.
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