Stretch

Looking for a little input on this one:

I've got a pretty rough idle. Car runs fine otherwise. I was recently driving around for a while with a bad O2 sensor (and CEL). I finally replaced the sensor. CEL gone. Rough idle still there. Replaced plugs. Rough idle still there. Took it in to the shop. Only code coming up is a bad O2 sensor on the other side ... but no CEL. I'll replace the other sensor but I dont suspect this will change anything with the idle. Any ideas on what this might be with no other codes coming up? I was thinking maybe a coil pack but I would suspect a CEL ... or at least a code. I've got neither.

Thanks!

paulroad

a torn vacuum line may not as its just not severe enough. I'd give listen and look under the hood for some vac or air lines that may have a slight rip in them. As car's age, it becomes common especially for the smaller diameter hoses.

You may want to check out the link Above for the 2.7 T study guide.

yrk2.7t@curbside

If is is all from the side of the o2 sensor a new sensor could cure it.

If it is one cylinder that is suspect it could be a coil pack or plug.

Or if you replace the o2 sensor and still have one side that is doing it/ or if it is the opposite side of your faulty o2 is could be the POS<ul><li><a href="http://www.ross-tech.com/vag-com/m_blocks/">measuring blocks</a></li></ul>

Misplacedyankee

Doesn't always give a CEL. I had one go with no CEL....