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HELP! Please... LH System Woes on B230FT 700

Okay - the Brick has been running MEGA-rich - So yesterday, I put on new Lambda (O-2 Sensor)and Cat Converter -

This DID NOT solve the problem... NOW, when I floor it - the bloody thing just coughs, dies down and generally BOGGGS at 4000 RPM!

Where do I go from here, folks?

The Air Mass Meter is suspect - some idiot had been monkeying with it prior to my getting the car (no cap on adjustment screw)... I need the settings and PROPER multi-meter readings as Haynes manual doesn't contain these, for some reason.

Also multi-meter readings for temp sensor - as my project for today was to tear off the Intake.... AAAAARGH!

All suggestions and how-to's received gratefully!


J






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