2002 Ford Windstar Winstar van

2002 FORD WINDSTAR
200,000 MILES • 3.8L • 6 CYL • FWD • AUTOMATIC
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OUTLAWED43
  • MEMBER
  • 2 POSTS
backfiring out the intake and exhaust. and number 5&6 cylinder are not firing. it has fire to the new plugs i installed. but engine rpms does not change when i pull the wire off the sparkplugs while its running. i did the same with the fuel injector wires. 1 thru 4 does change in rpms when i pull the sparkplug wires off when running. and also the injectors wires.
Aug 10, 2015 at 3:35 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
Did you have this problem before changing the plugs?

Have you verified the firing order?
Aug 10, 2015 at 4:36 PM
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OUTLAWED43
  • MEMBER
  • 2 POSTS
yes i had the problem before i changed the plugs and wires. and i did verified the firing order.
Aug 11, 2015 at 3:28 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
Verify your spark with a spark tester first. If you have a strong spark that can jump over 1/2", then you have to start testing injector circuits with a noid light.

Do you have any codes in the computer?
Aug 11, 2015 at 3:40 PM
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