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idle problem

JCR

Well-Known Member
Joined
March 13, 2006
Messages
115
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City, State
Lancaster, Pennsylvania
Year, Model & Trim Level
2002 XLS
OK guys I have a problem that maybe someone can diagnose for me. My 2002 Explorer XLS 4.0 4x4 with 101,000 miles, idles rough and at times will stall when stopped in gear (like at a traffic light) It started soon after having timing chains all replaced. I've had it checked by a Ford tech friend of mine and no real issues could be found (no vac leaks, no misfire, cylinder balance good etc) He is stumped also. I replaced plugs and wires, cleaned IAC, cleaned throttle body, PCV is working, etc) It has helped some but still not as good as it was. What else can I check to get my Explorer idling more like it should/did? I have searched here and have done or checked things in other threads concerning idle issues
 












According to my Ford Tech friend, timing is spot on.
 






Is it possible that the timing chain tensioner isn't working properly? Seems related to the recent work done.
 






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