2004 Ford Explorer

Tiny
RHAISLIP
  • MEMBER
  • 2004 FORD EXPLORER
Engine Performance problem
2004 Ford Explorer 6 cyl Two Wheel Drive Automatic

my explorer loses power once you get above 3000rpm. The computer shows misfires on cylinder 2 and cylinder 6. I have changed plugs, wires, checked the coil pack, and catalytic converter. The problem still persists. Does anyone have any idea what the problem might be?
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Friday, July 30th, 2010 AT 12:34 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you checked fuel pump pressure? Also, is there any miss below that RPM?
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Saturday, July 31st, 2010 AT 11:26 PM
Tiny
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Haven't checked the fuel pump pressure yet and there is no miss below thw 3000 rpm. Thanks
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Monday, August 2nd, 2010 AT 8:41 AM
Tiny
JACOBANDNICKOLAS
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Here is a how to for checking fuel pump pressure. Let me know what you find.

http://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
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Tuesday, August 3rd, 2010 AT 12:49 AM
Tiny
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Checked fuel pump pressure and it was fine.
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Thursday, August 19th, 2010 AT 12:59 PM
Tiny
JACOBANDNICKOLAS
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Have you checked for restrictions in the catalytic converter?
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Thursday, August 19th, 2010 AT 10:11 PM
Tiny
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We did that earlier and it was fine. The throttle system is electronic so we seem to think the computer that controls this function is going bad. Does that make sense?
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Friday, August 20th, 2010 AT 9:23 AM
Tiny
JACOBANDNICKOLAS
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It could be. Have you ever checked for an injector pulse on the cylenders that misfire?
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Friday, August 20th, 2010 AT 10:47 PM
Tiny
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Not exactly sure how to do that, but I do know that compression is good on all the cylinders.
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Monday, August 23rd, 2010 AT 9:43 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You will need what is called a noid light. Basically, you disconnect the wiring from the injector and plug the light in its place. When you crank the engine, the light should flash everytime the injector gets a pulse to fire fuel. Most parts stores will lend or rent the light to you.

Try it and let me know what you find.

Joe
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Monday, August 23rd, 2010 AT 10:32 PM

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