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 Message 1963 
 Mark Hofmann to Jim Haight 
 Re: chip programmers? 
 28 Jan 16 09:03:50 
 
JH> One thing I don't miss.... You can tell when you are driving behind a
JH> carburated car nowadays because of the smell. When carbs deteriorate,
JH> they are far less efficient. I think we used to take if for granted.

That and not having a catalytic converter.  That made a big difference when it
comes to smell.  

The downside of having a computer control the vehicle is it totally relies on
the sensors.  If one fails in a strange way it can cause the vehicle to run
horrible.  I had an O2 sensor fail in a strange way on the Durango once.
Instead of just going dead - which would have put the computer into a
fail-safe mode with regards to the O2 sensor, it was telling the computer it
was getting too much gas (maxed the voltage reading and was stuck at that
point).  This caused the truck to be starved for gas and could hardly get it
to drive home.  

When I hooked it up to my laptop, I saw that O2 sensor fail with a steady high
voltage vs the fluctuating reading you would normally see.  I replaced that O2
sensor and it ran perfect again.  You would have thought the motor was dead
just from the O2 sensor.

- Mark

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