I am have a number 4 cylinder misfire. I have change the plugs and wires could you tell me what else this could be.
Thanks, Dinah
Thanks, Dinah
Aug 7, 2009 at 1:49 PM
1998 Ford Windstar misfire number 4 cylinder
1998 FORD WINDSTAR
DINAH_SUE
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Does it misfire all the timeor only when cold? There are number of things that could cause a misfire.
^ Fouled, cracked or incorrectly gapped spark plugs
^ Low compression
^ Vacuum leak
^ Faulty injector
^ Powertrain Control Module (PCM) calibration
^ Plugged EGR orifice(s) in each primary port of the lower intake manifold
If you have a 3.8L engine remove the vacuum hose to the EGR valve and power brake it. If your van stops misfiring then you have plugged up intake ports causing too much EGR to cylinder #4. You would need to remove the upper intake and clean out all the little holes of carbon. Now if it is not running rough or you dont feel it misfire you may want to call Ford and ask if your vehicles PCM can be reprogrammed "updated"
^ Fouled, cracked or incorrectly gapped spark plugs
^ Low compression
^ Vacuum leak
^ Faulty injector
^ Powertrain Control Module (PCM) calibration
^ Plugged EGR orifice(s) in each primary port of the lower intake manifold
If you have a 3.8L engine remove the vacuum hose to the EGR valve and power brake it. If your van stops misfiring then you have plugged up intake ports causing too much EGR to cylinder #4. You would need to remove the upper intake and clean out all the little holes of carbon. Now if it is not running rough or you dont feel it misfire you may want to call Ford and ask if your vehicles PCM can be reprogrammed "updated"
Aug 13, 2009 at 10:59 PM
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