pitbull4x4 Posted June 29, 2009 Share Posted June 29, 2009 A friend of mine has a 87-88 MJ with a 4 cylinder that is running rich. Every 2-3 weeks it starts fauling the plugs. He is going to put a new fuel injector in. Would this take care of the problem? Link to comment Share on other sites More sharing options...
Geonovast Posted June 29, 2009 Share Posted June 29, 2009 Maybe. Replace the O2 sensor first. That's usually the cause of it running rich. Link to comment Share on other sites More sharing options...
pitbull4x4 Posted June 29, 2009 Author Share Posted June 29, 2009 Thanks for the help. Link to comment Share on other sites More sharing options...
BLHTAZ Posted June 29, 2009 Share Posted June 29, 2009 Maybe. Replace the O2 sensor first. That's usually the cause of it running rich. Agreed--it's not likely that the injector would be the cause of the trouble. There is something sending to much fuel, and the o2 sensor is the first thing on the list of suspects. Link to comment Share on other sites More sharing options...
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