Rough Idle/ shifting issue | Ford Explorer - Ford Ranger Forums - Serious Explorations
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Rough Idle/ shifting issue


New Member
March 23, 2014
Reaction score
City, State
Eastern CT
Year, Model & Trim Level
2003 Ford Explorer ST
So I have owned 2 F150's and recently downsized to an explorer sport track. Found an 03' with 103K on it for 5200$ Clean truck has a few minor issues that need to be fixed such has new hubs, shocks, lower ball joints and needs a power steering pump. Couple things have me slightly stumped so joined up here hoping someone could shed some light on the issues I'm having. The AC pump doesnt seem to kick on at all. I have a feeling its Electrical but I checked the fuse and it was fine. If anyone knows any common issue with the ac pumps on the sport trac's it would be appreciated. Also, I believe I have a vaccume leak or bad sensor somewhere. the idle is a little off and the intake seems to be making a little bit of a gurgle. I had put a K&N on it and i think it made it worse, and it started throwing a code for bank 2 O2 sensor Lean. when the truck is going from second to third and sometimes third to fourth it feels like it is going into neutral before it shifts. I don't believe the tranny is bad. I think it is most likely a vaccume leak from the crankcase breather tube elbow on the passenger valve cover or it needs new O2 sensors. Any one have any input?

Welcome aboard!! :salute:

I have moved your thread to the 2001-2005 Explorer Sport Trac Sub Forum for better exposure.

Good luck getting it sorted. :thumbsup:

Please keep us posted as feedback helps others reading this post looking for a fix to the same or similar issue!

2001 Sport Trac runs great but won't idle