[Shotimes] Semi-O/T: vulcan running rich

[Steve Tatro]

There's a bench test of O2 sensors on the SHOtimes website. 
http://www.shotimes.com/SHO3badO2sensor.html

I've never done this, so I can't vouch for it's accuracy.  I'm sure if
it wasn't perfect it wouldn't make it to the FAQ!

And no I don't think your straight pipe would cause your rich condition.

Hey, if you're so rich why don't you just replace everything?

;^)

Steve Tatro
Red/Black '93 with 181k miles
Monroe, Ohio

On Tue, 04 Jan 2005 21:03:35 -0500, Jon Heese <shotimes@jonheese.com> wrote:
> Pardon the OT, but I believe my '95 Vulcan is running rich and I'm
> curious if anyone has any ideas of what might be causing it.  I used to
> get 25-30 mpg out of her, and now I'm only seeing 15-20 on the highway,
> and her exhaust smells like I'm dumping money out of the tailpipe.
> 
> The only noteworthy thing about it is that the rear bank cat clogged
> about 2k miles ago, and I removed it and replaced it with a straight
> pipe.  I suspect that the cat died *because* of the rich condition, so
> I'm hesitant to think that it has anything to do with the cause of it.
> I'm not thrilled about the imbalance in backpressure between the two
> banks (it's on my list to fix), but would that cause it to run rich?
> 
> My list of possible suspects (in order of likelihood in my mind) are O2
> sensor, difference in backpressure between banks confusing O2 sensors,
> and the MAF (I've got a spare I can try).  I'm not particularly fond of
> the change-everything-out-until-it's-fixed auto repair technique, but
> I'm not sure how to narrow it down any other way.  So, anyone have any
> ideas for further diagnosis?
> 
> TIA,
> 
> Jon Heese
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