Howell / Dynamic EFI TPS replacement

J

jjdebarros

Member
Oct 22, 2015
39
11
8
Spokane, WA
I am trying to get my '77 Royale back up and running after sitting idle for 4 years.

I have a Howell / Dynamic EFI with spark control purchased from Applied.

I can't find the original documentation and I am having problems with the TPS sticking.

What GM make/model/year would be a good reference for a replacement TPS?

Do I need to calibrate it once replaced?

Currently when I turn the ignition on without starting the engine, WUD displays a voltage 0.4V in the idle position.

Can I just replace the TPS and rotate it to 0.4V in the idle position?

Thanks!
 
jjdebarros said:
I am trying to get my '77 Royale back up and running after sitting idle for 4 years.

I have a Howell / Dynamic EFI with spark control purchased from Applied.

I can't find the original documentation and I am having problems with the TPS sticking.

What GM make/model/year would be a good reference for a replacement TPS?

Do I need to calibrate it once replaced?

Currently when I turn the ignition on without starting the engine, WUD displays a voltage 0.4V in the idle position.

Can I just replace the TPS and rotate it to 0.4V in the idle position?

Thanks!
Click to expand...
Here's the Howell installation manual for our GMCs.


An excerpt from the manual:

1780977611877.webp
 
The Howell EFI system used a Holley throttle body so I don't belive a GM TPS will fit. Note that some Howell EFI users changed their throttle bodies to Rochester TB's.

Here is a link to Holley throttle body parts. There are several TPS parts listed on this page.

You could also contact Howell EFI
howellefi.com

- Howell EFI Jeep LS LT Vortec EcoTec3 & GM Based EFI Conversions

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howellefi.com howellefi.com
 
Applied GMC
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