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92 explorer 4.0 rough idle/stall when cold

Discussion in 'Under the Hood' started by vinni, January 17, 2009.

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    1. vinni

      vinni New Member

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      City, State:
      Missoula, montana
      Year and Model:
      92' xlt
      my 92 explorer runs fine when warm, but on startup...even if it has just sat for a few min it idles rough and stalls...it starts right back up, and does it again...then the rpm flutters between 6-900 until fully warm, even then i get a small rpm pulse.....the car is new to me...any ideas?
       
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    3. MrShorty

      MrShorty Explorer Addict

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      92 XLT and '87 Bronco II
      I would start with some basic diagnostics: test fuel pressure (see sticky in Under the Hood), check for gasoline in the vacuum line to the FPR, and pull codes (see stickies in EEC-IV forum). Check for vacuum leaks. Look for anything disconnected/unplugged under the hood.
       
    4. vinni

      vinni New Member

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      cleaned tcm, and going to pick up tool to remove mas and will clean....this morning ran fine after sitting all night, no sputter or stall. check engine light comes on and off???no pattern at all to it. I'm new to the vehicle but it has been in the family since new, but last few yrs were not well maintained (damn sister had it). changing plugs (any good tricks for rt side on engine plugs?), wires, fuel filter all today. anything else i should look for?
       
    5. MrShorty

      MrShorty Explorer Addict

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      For #3, and sometimes #2, I reach through the wheel well and get at the plugs from underneath.
       
    6. vinni

      vinni New Member

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      hey there thanks for the info....seens to ide far better now with new plug wires and a good cleaning of the mas & tcm...plugs are next.....and another question, ....the fuel filter...is it on the frame rail? I'm getting an occasional dead spot for a second and am assuming it is the filter since it has never been changed, i'm thinking this is causing the occasional stall when at idle. so, wires, filters, plugs...any other tune up tips for these rigs?
       
    7. vinni

      vinni New Member

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      City, State:
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      Year and Model:
      92' xlt
      sa foam in vac lines?

      if i was to do this.....where do i put the sea foam and how much? in the tree at the rear of the engine? will it work/help with anything?
       

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