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Are you really sure the exhaust is airtight in front and around the O2-sensor?
Have you tried installing the sensor in the other tube for comparison?





I have it in the RH header collector and the gasket isn't leaking as far as I can tell. I have a bung in the other collector but I'm not sure if the wiring is long enough to reach. I'd have to pull the carpet to reroute the whole deal.

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I went ahead and put the #83 jets back in. The power came back. The A/F numbers went a bit richer but not as much as before. The wide swing of the guage is a bit less than before. With the metering block off, I checked the power valve. The gasket underneath was a bit off center but was not torn. I'm not sure if it was leaking. I used a new power valve and gasket anyway.
The car feels as fast as it was before I installed the #81s. I may just leave it since the engine seems to respond well to a richer setup.

Last edited by Frankenduster; 04/10/14 01:17 AM.