Uh huh....
Try checking the connection to the AFM. Strangely enough, the bus will run
with it disconnected, just not very well, just not very long. Fix it soon or
your Cat is toast.

tim in san jose (don't ask how I know about this)

>My 86 westy is running very rich with spark plugs becoming sooty after a
>dozen miles or so resulting in a rough running engine and some black
>smoke at the the exhaust. Compression is good , timing and idle at
>specs.  tempsensor2 checks out although it is difficult to get a
>reading. Replaced the idle stabilizer valve(it needed it}.  What are
>some of the more logical  things to take a look at?  How does one check
>out the oxygen sensor?  Any suggestions would be much appreciated.
>Thaking your in advance,
>Alex

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