Question about 2004 Ford Explorer

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Rough Ideal on 2004 Ford Explorer

Hello Need help on a 2004 Ford Explorer. Having problems with Ford explorer rough ideal & missing. Changed plugs & wiring. Used Gas treatment. Change fuel filter & air filter also. Any solutions

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  • jsteppe Jun 29, 2008

    My 2004 Explorer, which I bought with 42000 miles on it 15 months ago and now only has 49000 miles, has a rough idle although it seems to drive fine (no miss that I can tell). Have changed the fuel and air filters and added lots of fuel injector cleaner. The local tech said he has seen the spark plug wires cause a problem. I have viewed them in the dark with the engine idling to see if any there is any external spark but do not notice any. Next step may be new plugs and wires.

  • nangoldston Jul 07, 2008

    2004 V8 with 49000 miles on it. Engine quietly dies when I set my cruise control to 40 or less. Starts right back up though. Changed fuel filter, though I knew that would not fix it. Not idling rough and drives well with good gas mileage (15 city and 20 highway). Any suggestions?

  • Beerman2 Jul 08, 2008

    I have the same problem with my 2004 explorer 4lt engine with 65,000 I bought it new and it did not seem to start until I ran E85 gas in it. I have changed plugs wires and filters with no help I am going next to use an injector cleaner to see if that helps. Other problems that I have encounter are load rear end roar at 50=60 mph and a gas gage that works sometimes. Fix on the gas gage seems to be too much sulfur in most gas and need to use Mobile gas which contains an additive to deal with this or add tectron to other gas seems to work but it is a permanent problem and the fix needs to be continued- fix was recommended by Ford mechanic but Ford denies the problem. Any suggestions on any of these issues would be great

    Rich B

  • Rudawg Sep 02, 2008

    My 04 Explorer has a rough idle but runs great. I have changed the spark plugs and wiring also the Idle Control Unit as well as the throttle body. They are colocated. Put high octane fuel in tank as well as fuel additives but still it has a rough idle. It feels like a vacuume leak or something. Don't know, but sure wish someone could give an answer. My next step is a complete diagnostic but I am getting the feeling it will show no problems. Can someone help on this problem. With as many people reporting the same problem, there has to be a reason. Thanks.

  • imben6 Jan 24, 2009

    i a 96 explorer i have same problem rough ideal how ever if i ideal itup just a little it smooths out i put it on a computer which said bad 02 sensor on #2 bank which i changed now i put it back on computer which now says bad egr valve and bad catalytic converter

  • Eddie86 Mar 12, 2009

    My 2004 explorer idles rough. I already changed wires,plugs, added fuel injector cleaners.Nothings works.Only have 75k miles on it.
    Help !

  • guesser Apr 10, 2009

    2004 explorer, 80k miles with sudden rough idle. replaced plugs, wires, cleaned mass air flow sensor and intake, replaced fuel filter and tried multiple cleaners through several fill-ups. no results with any attempt. i've been told that it could be the ignition coil pack, i need to do more research before spending $100 more.

  • Anonymous Mar 12, 2014

    need to know if 2004 ford explorer has front and rear struts

  • Anonymous Mar 16, 2014

    could it be in the electronic distibuter?

  • Anonymous Mar 20, 2014

    is foot required to be on brake to start 2004 Explorer

  • Anonymous Mar 23, 2014

    Rough idle when in gear and at low rpms seeems slugish like a vacuum leak but cant find it. Smells like gas when running in park. I changed plugs wires cap and used fuel treatment. What could it be, a sensor?

  • Anonymous Mar 29, 2014

    see summary of problems above.

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Open hood and listen for vacuum leak sound. pcv hose is most likley cause.

Posted on Sep 04, 2008

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Remove the IAC (Idle Air Controller (or Valve)) and either replace it or clean it with ether.

Posted on Nov 19, 2010

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Rough idle shuts off while driving,cannot drive above 15 mph

Posted on Jun 07, 2013

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TSB 04-21-12

Posted on Aug 20, 2010

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Have you replaced a fuel pump? I had to have my fuel pump replace, my fuel relay switch on the top of the pump, and my computer reset. Then this morning it started having problems again. Seem like the same issue I've already had worked on.

Posted on Jul 23, 2008

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Hello Need help on a 2004 Ford Explorer. Having problems with Ford explorer rough ideal & missing. Changed plugs & wiring. Used Gas treatment. Change fuel filter & air filter also.


The computer should have coded a problem. If it did not code it is usually a vacuum or compression problem. With the motor running use a spray bottle of water and go along the seams of the intake manifold, Brake booster, EGR valve, and anything that has a vacuum line and spray them.

If you have a vacuum leak the water will be drawn in and the idle will be affected. That would be the gasket or part to replace. Sometimes on 4.6 SOHC engines the area under the Airhorn clogs the intake ports for the EGR. The groove under the gasket needs a cleaning.

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