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It did the trick. I've been having rough idle / sputtering issues in a bad way on cold start. Car has a new CHTS and harness, and a new MAF. Neither of those changed anything.


The computer upgrade all but cured it. One sputter on cold start then the idle smooths out and I can drive away.


Thought I'd share. Car is an 85 NA MT car.


Takes all of 10 minutes to swap the ECU. Easy as it gets.
 

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did you run the codes on the 85 ecu before you swapped the 87?
I replaced my CHTS only because the ecu code indicated that it was failing and the engine was running rich.


bon
 

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It did the trick. I've been having rough idle / sputtering issues in a bad way on cold start. Car has a new CHTS and harness, and a new MAF. Neither of those changed anything.


The computer upgrade all but cured it. One sputter on cold start then the idle smooths out and I can drive away.


Thought I'd share. Car is an 85 NA MT car.


Takes all of 10 minutes to swap the ECU. Easy as it gets.
Yep, I came up with that mod years ago, the better fuel curves and upgraded computer make the 84/85 cars run like an 87. I am Slicktop from the old z31.com board.
 
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