91 LeBaron 3.0V6 fault code 22?

Hello:

My 1991 LeBaron is having an issue where the Check Engine Light will
come on evrey 5th, or 6th HOT start. It never comes on on a cold
start, and only ever so often will it come on after a HOT start.

Codes are 12, 22, 55.

The car has 97K miles, and all sensors are orignal (except 02 sensor).

I have noticed also that WARM idle seems rough on occasion. This car
has spoiled me as silky smooth at idle since new, so I have noticed
the rough idle immediately.

No other issues; thermostat is working well (and is less than 2 years
old), no over heating, great MPG (23 in the city).

So, should I just change out the coolant temp sensor? I assume it is a
cheap enough part to try as a first step.

Thanks for any advice!

Bill

It is a coolant sensor fault and the cheapest guess would be to replac the
coolant temp sensor and check for agood connection. Whe the sensor detects
a fault it puts the controller into a default setting that turns the
raditor fan on annd the timing is not controlled by the computer. it goes
into a default 12 degree advance only and will cause the engine to run
bad.

Glenn Beasley
Chrysler Tech

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