4 AND 6 CYLINDER MISFIRE I CHECKED FUEL PRESSURE (OK)

  • Tiny
  • slyk
  • 2002 Ford Escape
  • 190,000 miles

2002 Ford Escape V6 3L - 4&6Cyl misfire. I check : fuel pressure (OK), compression (OK), coils (OK), spark plugs (new), injectors(OK) but I don't now if is signal from computer. Catalytic converter on this side is melted inside. Only 304 & 306 codes in memory.

2 years ago same side cylinder. Misfire and cat was melted. I put new cat and new coils / plugs.

Pleas help me, great site for me : -)

Monday, February 6th, 2012 AT 12:31 AM

32 Answers

  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Are the plugs getting spark?

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Monday, February 6th, 2012 AT 12:50 AM
  • Tiny
  • slyk
  • Member

Yes I have sparks.

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Monday, February 6th, 2012 AT 1:36 AM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

How did you check fuel pressure and the injectors?

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Monday, February 6th, 2012 AT 1:50 AM
  • Tiny
  • slyk
  • Member

I rent fuel pressure test kit - with engine off and running was 65psi. I don't now if fuel pressure regulator is good - no change when I disconnect vacuume hose. When pressure was on I check each injector for (spray) by two wires + & -. They was working (no leaking).

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Monday, February 6th, 2012 AT 3:18 AM
  • Tiny
  • rivermikerat
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  • 6,155 posts

Are the injectors being pulsed when you try and start the engine? Will it start if yo spray carb cleaner in the intake?

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Monday, February 6th, 2012 AT 3:53 AM
  • Tiny
  • slyk
  • Member

I have no problem to start engine but is not working on 4 & 6 cyl. - Is shaking.

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Monday, February 6th, 2012 AT 11:06 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Disconnect the fuel injector harness and measure the resistance of #s 4 and 6. See attached for specification.

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Monday, February 6th, 2012 AT 11:45 PM
  • Tiny
  • rivermikerat
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I would also check compression and make sure the injectors are being pulsed.

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Monday, February 6th, 2012 AT 11:52 PM
  • Tiny
  • slyk
  • Member

Resistance is OK, I check all 6. Compression is 195-205 at all 6 cyl.

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Tuesday, February 7th, 2012 AT 1:46 AM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Can you move the individual injectors around? Like put #3 into #4, and #5 into #6, and vice versa. See if the problem follows the injectors. What about plug wire impedance?

If I recall this has a distributor. What does it look like? What about the cap?

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Tuesday, February 7th, 2012 AT 3:48 AM

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