[chrismorse]

I have heard that the accuracy of the oxygen sensor m ay be seriously compromised by a pin hole exhaust leak or a leaking header gasket. GIGO - don't know how serious this is BUT...

So, i ran a bore scope into my 74 heat exchangers and found holes on both sides, one from rust through and another from speed bump "wear", a new opportunity to upgrade (?)
SSI and M&K 2-2, fug it life is short.
chris