Quote:
Originally Posted by Ryland
A common pattern for the hesitation is bad o2 sensor, unplug it to test it, if the problem goes away then it's the o2 sensor, while it's unplugged it's running in open loop mode and will be running a bit richer and will never go in to lean burn.
Other problem that can cause hesitation is a bad throttle position sensor, but that is much less common.
Common problem that causes idle bounce is a vacuum leak, check the PCV system including the lowest point in the hose, under the intake manifold, there is a grommet that drys out and shrinks causing a vacuum leak, $3 part and someone with small hands tends to take care of it.
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Well I unplugged the o2 sensor and voila, all hesitation ceased. Guess that's good news and bad news. At least I know what the problem is, bad news is the price.
What options are there for replacing the o2 sensor that don't involve buying the very expensive OEM part? Can they be cleaned or reconditioned much?
I see some on ebay for sale as well, how are those?
I also found this from searching, seems not too bad and it's an NTK.
www oxygensensor.net/ntk_o2/24300.php
Thanks for all the advice, very helpful everyone!