Join Date: Mar 2002
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Re: Howell TBI-O2 Sensor problem
Have you tried swapping out the O2 sensor for one from another vehicle that is running well - in other words, a known good one? I know it sounds silly, but just because a part is new doesn't mean it is good. You'll find lots of people that have chased ghosts for a while before finally checking the "new" part and finding their problem.
Another possible cause is a vacuum or manifold leak (could be intake or exhaust). An easy way to check for vacuum leaks is with a burnable carb cleaner. As RRich has pointed out countless times on this forum, not all carb cleaners are burnable. If you spray it directly in the intake and the RPMs go up - it's burnable.
Of course, I would also put a multimeter to the extended wire's leads and make sure they didn't hose that up on you. [img]images/graemlins/tongue.gif[/img]