Re: 92 Plimouth Colt Vista

Posted by jimg.allentown on December 03, 2021 at 15:12:16 from (24.115.194.186):

In Reply to: 92 Plimouth Colt Vista posted by rlp in Co. on December 03, 2021 at 13:42:19:

Sounds to me like you have a computer problem. Being a 1992, it would be OBD1 and not OBD2.

The 'check engine' light should illuminate when the key is on and engine not running. A prime cause of the problem you describe would be bad grounds or Vpwr (12 volts) not getting to a part of the computer. You should also have 5 volts B+ at most sensors.

A common cause of loss of economy is a failed O2 sensor. I've seen more than one bad O2 sensor drag the mileage down.

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