I recently acquired two 80s vintage 300s, an 85 and 86, both non-turbo. They are carbon copies of each other except the 85 is a 5 sp while the 86 is an auto. Neither has been smoked or registered in about 6 years. Because the 86's body is in better shape, I am using the 85 as a parts car for the 86.
I rebuilt the 86 engine. Compression, cylinder leak down all checked good. Also put the 5 sp from the 85 into the 86 and, because the 85 ECU is compatible with the transmission, put the 85s ECU in the 86.
Ran the diagnostics on the ECU and came up good with flashing 44s. But the engine runs extremely rich and doesn't come close to passing smog.
In reading these posts I've seen references to Nistune which may be the answer but I'm not familiar with it.
Any thoughts appreciated.
I rebuilt the 86 engine. Compression, cylinder leak down all checked good. Also put the 5 sp from the 85 into the 86 and, because the 85 ECU is compatible with the transmission, put the 85s ECU in the 86.
Ran the diagnostics on the ECU and came up good with flashing 44s. But the engine runs extremely rich and doesn't come close to passing smog.
In reading these posts I've seen references to Nistune which may be the answer but I'm not familiar with it.
Any thoughts appreciated.
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