Question about 1987 Plymouth Reliant
14 = MAP sensor voltage below .16V or over 4.96V
52 = Oxygen sensor stuck at rich position
55 = End of codes (not a fault code in itself)
Would appear that you have either a bad MAP sensor, or a leaking vacuum line somewhere.
The bad readings from the MAP sensor will cause the trouble code with the oxygen sensor (and the reason why you failed the test,) but this is not to say that the oxygen sensor can't be bad also.
Start with the cheapest thing, tracing vacuum hoses and lines for cracks and/or leaks. There should be a diagram somewhere under the hood that shows you the routing of the lines, attached to the underside of the hood or possibly on the front area near the radiator. With the age of the vehicle, I wouldn't doubt that this is the problem.
If everything checks fine with the lines, then try replacing the MAP sensor. These do have a tendency to fail.
Good luck, line tracing is bot a fun job, I've been there many times.
List of Codes
Posted on Apr 08, 2011
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Posted on Jan 02, 2017
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