Rough idle

Asked by Kevin Mar 21, 2018 at 09:08 PM about the 2005 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Check engine lite on o2sensor. Been ok for 5000
miles.started rough idle ,blinking lite. Reset
pcm,lite out,ran good 50 miles and started all
over.Done this few times to get around. Shop says
no code when not blinking. Heard could be cam or
crank sensor.any ideas.hard to get to shop when it
starts blinking. I live 50miles from town

2 Answers
475

Franco answered 6 years ago

What is the exact code you're getting? I had an issue with my O2 sensor & cat on my 2011 Liberty, that, when cleared, would reappear after 30-60 miles. Ended up having a broken driver-side catalytic converter and since replacing that + the O2 sensors, its been perfect since. During this time, I had 20-30% WORSE fuel economy. Other than the rough idle, are you experiencing any below average fuel economy? How about slow acceleration / need to put your foot down a bit more when accelerating?

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