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Rough Idle, Check Engine Light is On, Spark Plug Issue - connected?

Discussion in 'Stock 1995 - 2001 Explorers' started by bikeguy, August 25, 2010.

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    1. bikeguy

      bikeguy New Member

      Joined:
      August 25, 2010
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      City, State:
      Traverse City, Michigan
      Year and Model:
      2000 Explorer 2dr
      I've got a 2000 Explorer Sport (2dr) w/ 4.0 X-Vin OHV with 126xxx miles and I've got a few engine issues I'm trying to diagnose, wondering if the issues I'm having are connected - mechanic hasn't been a big help.

      Here's what I'm seeing:
      - Check Engine Light has been on for some time, scanned codes, says I have a large vacuum leak (can't remember what the exact code was). Per mechanic's suggestions, I've replaced the gas cap 2x, hasn't fixed problem. I'm wondering if there is a valve in the vacuum system that has gone bad?

      - New Motorcraft plugs & wires. Plugs have needed replaced at least once a year. Center electrodes get worn down to almost a nub/fine point and cylinder will start missing badly. Usually the offending plug will be on the lean side and codes will indicate a cylinder is running lean. Every time it's happened, it's been a different plug that goes bad - never in the same cylinder twice.

      - At start-up, truck idles rough when cold. At/below idle, idles roughly, chugs
      - rev the throttle in neutral or accelerate over 2000-2500, cleans rough idle out and truck starts/runs great while warm.

      - Slowly losing coolant from radiator, can't determine where. Not seeing any leaks or drips, doesn't leak while sitting. I will occasionally smell a puff of coolant via the heater/ac ducts when starting the truck (mostly when truck is warm), but that's about it. Truck doesn't appear to be smoking in engine compartment or excessively out tailpipe. I've pulled plugs a number of times in the last year and there has been no evidence of coolant on the plugs. Truck has not overheated to my knowledge. Wondering if I have a leaking heater hose or something like that? Got my fingers crossed, really hoping it's not a head gasket leak - need to run a compression test soon.
       
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    3. specialized7

      specialized7 Active Member

      Joined:
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      City, State:
      saskatoon
      Year and Model:
      99 SPORT
      Upper and lower intake gaskets, id get someone to pressure test the system.
       

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