Question about 2002 Jeep Liberty
I will guess. Give me a lot of leeway here
Only me,BUT,if I got 3 plugs fouled twice,I would halt everything.
There would be no new converter,O2 Sensor,that was damaged, as a result of your issues,UNTIL, I solved the cause of their failure.
The TPS,MAP and IAC ,ONLY get replaced when I,just me again, have used a VOM or Oscilloscope to test,AND, the testing proved they were bad.
So, I think, a dry and wet cylinder compression test,a cylinder leak down test, a coolant pressure test,a check for combustibles in coolant,and even an exhaust gas reading,just to start a list of things to do,would be necessary, to tell you why the plugs are fouling.
If I went the wrong way,on oil or coolant fouling,just maybe a bad fuel pressure regulator,BUT only 3 plugs,THAT'S THE KEY
You got a bad head gasket or intake gasket
The TPS,MAP and IAC were replaced ,due to a guess and not testing.
If this was a dealer,they installed a converter and never attempted to solve the cause of failure. (Overheating,Rich Fuel Mixture or Coolant Contamination)
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
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