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Dying 84 Coupe GT Needs to Pass Emmision Test

Good Afternoon!

My 84 Coupe GT barely passed the emission test two years ago,
and it's time to test it again. I may part this Coupe out in
the near future. But, in the meantime, I have no choice but to
keep it licensed & insured, and to do that, it must pass

HC and CO levels were at the upper limits last time, and I
suspect the lambda sensor is kaput. I really don't want to 
spend any more money on parts for this car.

What's the secret to get this thing to pass? What commercial
chemical preparation can I dump into the tank, and how can I
adjust the idle mixture, etc, to get it to pass?

As always, tia... -doug q

-Douglas Hurst Quebbeman (dougq@iglou.com)            [Call me "Doug"]
74 100LS Auto, 77 100LS Auto, 84 Coupe GT, 86 5Kcstq
"The large print giveth, and the small print taketh away."  -Tom Waits