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

[Jon Heese]

Also, let me add that I have no CEL, no codes.

Regards,
Jon Heese

Jon Heese 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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