1979 Cadillac Seville Can it be the map sensor?

Tiny
LNDRVR2009
  • MEMBER
  • 1979 CADILLAC SEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 81,233 MILES
It all started when I drove the cadillac back from San Diego to Phoenis. Approximately 3 hours into the trip, the car all of a sudden would not hold the speed, what I mean is that the car would gradually sloww down, unless I floored the car up to the highway speed, but then, when I would let off the accellerator, the car would lower it's speed again. Then, once I stopped the car and shut it off, it would start right back up and runn fine in idle, but, as soon as I put the car into gear and tried to put pressure on the accellerator, the car would act like it it is choking itself out. I have a 1979 Cadillac seville that runs extremely rich and after about 20 minutes of running in idle, the cadilettic convertor gets hot and smoke starts to surround the car.
I would like to know if it is the computer under the dash that is causing this or if it is a minor adjustment to the throttle body.
I have replaced all the vacuum lines.
Friday, February 5th, 2010 AT 7:53 PM

1 Reply

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

It sounds like the Catalytic Converter is failing or failed. Here is what you do.

If you can remove the O2 sensor in front of the cat and take for test drive. If all works normally then you will need to replace the Cat.

Post findings.

.
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Friday, February 5th, 2010 AT 8:09 PM

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