Rough idle when at a stop light?
Hi everyone I have a 02 explorer with
a 4.0 v6. It idles rough not really bad
but enough to hear it. Whenever I'm
at a drive thru or at a stop light when
the brakes are engaged. I have a
engine light on for 02 sensor and i
hear a sound Which sounds like a
pulley on the passenger side. Well I
changed altenator, and belt tension
in the last 6 months and the only
other pulley on that side is the idler
pulley. Would it be both? I'm
changing my 02 sensors and pulley
If one is still making a noise, I would inspect that first. O2 sensor code isn't always the sensor itself. Maybe a vacuum leak?
I checked vacuum lines haven't heard or seen anything. I've changed egr valve. Icv... Still ran bad. Looked at spark plugs nothing. Ima keep ya posted when I do change it