« previous next »
Pages: [1]   Go Down

Author Topic: Unknown module under the dash  (Read 4355 times)

Offline Psycho_Bob

  • Newbie
  • Posts: 19
Unknown module under the dash
« on: December 23, 2008, 11:37:39 pm »
I was installing an AM/FM/CB/Cassette radio out of an 83 Eldorado in my '81 C-10  In doing this I got to spend plenty of on my head time looking under the dash.  I found a module mounted under the dash that I am not sure about.  It is a box mounted upright right above the accelerator pedal.  It appears to go to the distributor harness, but some of the wires to the distributor have been cut and looped on the distributor side.  Can anybody tell me what this module is and why the modification has been made to the wiring on it.

Thanks
Logged

Offline Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
Re: Unknown module under the dash
« Reply #1 on: December 23, 2008, 11:45:23 pm »
the only thing i can think of is a tach
Logged
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19192
Re: Unknown module under the dash
« Reply #2 on: December 24, 2008, 08:20:26 am »
Probably the ESC controller which retatrds the ignition timing based on input from the knock sensor. Someone probably bypassed it.
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Psycho_Bob

  • Newbie
  • Posts: 19
Re: Unknown module under the dash
« Reply #3 on: December 25, 2008, 03:05:18 pm »
Would it be worth re-enabling it and would it gain me any gas economy?  The previous owner has rigged up everything else in this truck for no good reason.  I have seen several other posts where people already have them disabled, but never explained why.   The compression is down enough on my truck that I don't have to worry about spark knock  with the corn gas around here.
Logged

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19192
Re: Unknown module under the dash
« Reply #4 on: December 25, 2008, 03:56:05 pm »
I wouldn't bother. If you're going to upgrade the ignition system that's a good idea but the esc ignitions are junk.
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline bigkountry

  • Frequent Member
  • **
  • Posts: 453
Re: Unknown module under the dash
« Reply #5 on: December 25, 2008, 04:23:02 pm »
I removed the ESC form my 81 K10 long ago.
Logged
81 Scottsdale K10 "Under construction"

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18468
    • http://www.73-87chevytrucks.com
Re: Unknown module under the dash
« Reply #6 on: December 27, 2008, 10:13:09 pm »
If someone bypassed it the only think you will gain is aggrivation.  Most all of them were bypassed.  Even dealerships bypassed them.
Logged
Pages: [1]   Go Up
« previous next »