[Gmecm] TPS for diesel and now PCM Algorithm

[Don Sauman]

Yep an NA 6.2 diesel but it has a vacuum pump. I went for the 4L80E for 
the strength and electronic control of shift points etc.

BTW the Hummer had a potentiometer type TPS on an NA 6.5 backed up to a 
4L80E TCM'd trans.

I think the final answers are a 16128428 if I can get one or a PCS 700.

Thanks for the input guys,
Don

Ne14RoxCJ wrote:

>All of the pre-EFI trucks with a 700R4 used a vacuum switch on the firewall
>to activate the TCC. The vacuum went through a coolant temp switch to stop
>TCC lock-up when cold. I have been using just the vacuum switch on my TBI
>and, now TPI Blazer for years and I can say that I like the set-up better
>than letting the ECM control it. Other trucks I've worked on have ALWAYS
>needed some adjusting of the TCC parameters to make them right with bigger
>tires/lower gears. Imagine the TCC locking up in third gear at 35 mph and
>RPMs drop to 1200. Give it a little gas and it starts locking and unlocking.
>Sure, it's nice to be able to adjust those settings, but it is just an
>un-needed hassle in most cases I've seen. My vacuum switch set-up uses a 4th
>gear pressure switch in the valve body to only allow lock-up in 4th (OD) the
>only time I need TCC lockup. It unlocks above 90-92 kPa and locks back under
>about 85-88 kPa.
>
>Oops, I just remembered that you're using this on a diesel. They don't make
>the same vacuum as a gas, do they. Anyway, that's my view of the types of
>factory TCC control systems. A really simple option would be to run the TCC
>solenoid to a floor mounted dimmer switch and activate it manually. Just
>remember to also run it through a brake pedal switch and a 4th gear switch
>for safety.
>Beau
>
>-----Original Message-----
>From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
>Of Burntkat at sc.rr.com
>Sent: Tuesday, January 17, 2006 3:35 PM
>To: gmecm at diy-efi.org
>Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm
>
>It does TCC lockup, and if he's running a 700R4, that's all he needs.
>
>So the info helps me- thanks! 
>
>
>-----Original Message-----
>From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
>Of Steve Ravet
>Sent: Tuesday, January 17, 2006 3:17 PM
>To: gmecm at diy-efi.org
>Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm
>
> 
>  
>
>>I located both types of TPS and the one I have settled on is 
>>a potentiometer type TPS that was used in mechanical injector 
>>pump 6.2 in Hummers when used with a 4L80E trans.
>>
>>As I have a couple of 1227747 PCMs handy I was thinking of 
>>disabling the fuel side and letting it just run the trans.
>>
>>Am I nuts to try this aproach?
>>    
>>
>
>Maybe...  The 747 doesn't do transmission.
>
>--steve
>
>
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-- 
Don Sauman

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