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TDG Member Since 2004?
584 Posts
Discussion Starter #1
Hey Guys,

One of our work vans has an odd problem. It idles rough but runs perfect at all other driving speeds. Codes indicate a lean condition and when I got to looking around with my diagnostic scanner, I find that the O2 sensors are not functioning at idle.

However, if I barely crack the throttle, they begin to work and the engine runs smoothly. Internet searching has pointed to an O2 sensor relay which I will check next time I get a chance.

Any other ideas?

Thanks for the help!
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