Question about 1998 Ford Econoline

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I have mis fire in #3&5 what could be the problem

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It could be something in the ignition system" to make the answer even more vague. My answer would be "Try the easiest/least expensive of these solutions first and work your way down the list until the problem is resolved: 1) Bad/leaking spark plug wire... spray engine with water mist from spray bottle in the dark and watch for arcing/crossfire from the wire(s) and replace as necessary 2) invest in a vacuum gage and determine if there are any vacuum leaks; replace worn/damages hoses or components as required 3) swap any questionalble coil(s) with coil(s) known to be good (you can get one at a salvage yard cheap for test puposes) and see if the problem moves with the coil(s); if so, replace coil(s) 4) pull the spark plug wire off the offending cylinder's plug/coil and see if there is a large difference in engine idle; if so the issue is not electrical, if not then suspect a bad spark plug 5) have ALL the fuel injectors professionally tested/cleaned and verify that the offending cylinder's injector is working correctly; replace as necessary (recommend replacing the whole set as most of the cost is labor to remove and replace them. That should pretty much eliminate the "cheap and easy" stuff. Barring any of the above from fixing your problem, it may be time to consult an engine specialist to see if there are mechanical issues with the engine.

Posted on Aug 07, 2010

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It could be spark plugs or sparkplug wires. If not one of those it could be fuel injectors.

Posted on Jul 28, 2010

  • richsap Aug 07, 2010

    Why not just state "It could be something in the ignition system" to make the answer even more vague. My answer would be "Try the easiest/least expensive of these solutions first and work your way down the list until the problem is resolved: 1) Bad/leaking spark plug wire... spray engine with water mist from spray bottle in the dark and watch for arcing/crossfire from the wire(s) and replace as necessary 2) invest in a vacuum gage and determine if there are any vacuum leaks; replace worn/damages hoses or components as required 3) swap any questionalble coil(s) with coil(s) known to be good (you can get one at a salvage yard cheap for test puposes) and see if the problem moves with the coil(s); if so, replace coil(s) 4) pull the spark plug wire off the offending cylinder's plug/coil and see if there is a large difference in engine idle; if so the issue is not electrical, if not then suspect a bad spark plug 5) have ALL the fuel injectors professionally tested/cleaned and verify that the offending cylinder's injector is working correctly; replace as necessary (recommend replacing the whole set as most of the cost is labor to remove and replace them. That should pretty much eliminate the "cheap and easy" stuff. Barring any of the above from fixing your problem, it may be time to consult an engine specialist to see if there are mechanical issues with the engine.

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