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Discussion Starter #1
I have a 1989 iron duke and I had it running alright on an 92 ecm and I swapped back in the computer that came with the motor but it would start and not run for more than a second or so, I do not have a cat on and was wondering if you had any ideas on it, if it was timing or just needing a cat or anything thanks
 

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Been there Done it
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8,191 Posts
Maybe the 89 ECM is bad.

Are you putting an 89 engine in a 92 truck? Or a 92 ECM in an 89 truck?
They may be pinned differently.
 

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Been there Done it
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8,191 Posts
Well as long as you use all the 92 sensors you should be OK running the 92 ECM in the 92 truck. Don't think they made any changes to the engine itself in that period.
 
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