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Cold Driveaway Improvement, 82-84 CIS Posted by Kevin K [Email] ![]() ![]() |
Always have had 'cold driveaway' lean condition in my 83T. The lambda o2 system kicks in too soon, defeating the necessary initial cold enrichment
provided by the control pressure regulator. Gutless 'till warm.
Townsend has some related TSB's and info. Two differnt kits were available, one for 82-83 NA, other for the 84. Both no longer available. I know the 84 kit has switch that delays the lamda control kick in 'till eng is warm, as is done in all later CIS models. Not all cars were fixed by Dealers.
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Looks like for 84, a simple temp-switch at t-stat housing is added (total of 3 there). It is connected to ecu term 12 by way of decel relay, provides cold ground.
For 82-83, you need to go to an 84+ 8V t-stat housing, or mabe plumb sensor into the heater line.
For 81, same as 82-83 except you need to run wire back to the ecu ... assuming term 12 exists there, as I think it does.
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I'll try it on my 83T, any other related info ... Dana?
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