btw, just to add more info to this post. The cat converter was diagnosed to be bad and it was replaced back on 08/09

These were the measurements post cat converter replacement:

@15mph RPM:1671
HC:88 - PASS (max is 110)
CO:0.02 - PASS (max is 0.71)
NO:37 - PASS (max 772)


@25mph RPM:1753

HC:25 - PASS (max is 85)
CO:0.01 - PASS (max is 0.59)
NO:16 - PASS (max is 711)

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89 300E - 240k +