I am trying to find how you can tell what ecu you have when all the markings and numbers and stickers are all gone. I believe this is my problem but there are several different ones that fit my 1991 Cherokee 4.0 HO. I know some times it can be very suttle thing different about them, but have no way to start to identify mine

 

Are you talking about the PCM?



How did you determine it's at fault?

 

The b is pronounced, though its sound is very subtle, and many miss it.

subtle


/ˈsʌtəl/

adjective
1. not immediately obvious or comprehensible
2. difficult to detect or analyse, often through being delicate or highly refined: a subtle scent
3. showing or making or capable of showing or making fine distinctions of meaning
4. marked by or requiring mental acuteness or ingenuity; discriminating
5. delicate or faint: a subtle shade
6. cunning or wily: a subtle rogue
7.operating or executed in secret: a subtle intrigue


Derived Forms
subtleness, noun
subtly, adverb


Word Origin
C14: from Old French soutil, from Latin subtīlis finely woven

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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