'05 FX4 5.4l booging down in overdrive only

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12-08-2015, 08:24 AM

#11

mtulett1

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Quote:

Originally Posted by vintageman

Did you clear the codes or disconnect the battery when you swapped the plugs and COPs? If not, I would clear the codes and see if the same ones come back again just in case. Have you checked the fuel injector or injector plug at the misfire cylinder yet?

codes were cleared

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12-08-2015, 08:25 AM

#12

mtulett1

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Quote:

Originally Posted by techrep

sounds like a clogged cat...

does a clogged cat cause a misfire?

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12-08-2015, 08:41 AM

#13

techrep

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oh yeah... any smell of rotten egg coming from them after reaching operating temp...do any of them glow red...ie super hot after a good drive ?

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12-08-2015, 08:58 AM

#14

mtulett1

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Quote:

Originally Posted by techrep

oh yeah... any smell of rotten egg coming from them after reaching operating temp...do any of them glow red...ie super hot after a good drive ?

ill have to check to see if they are glowing. do you know where or best place to get a new cat? i can replace it myself.

Last edited by mtulett1; 12-08-2015 at 09:11 AM.

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12-08-2015, 09:51 AM

#15

techrep

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I believe you have 4 cats on your 05...

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12-08-2015, 07:19 PM

#16

mtulett1

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Quote:

Originally Posted by techrep

I believe you have 4 cats on your 05...

what size pipe are they 2.5" or 3". what cats would you recommend? i'm on a tight budget.

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12-08-2015, 09:02 PM

#17

powerranger262

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Before getting too excited, you should get them checked. An exhaust shop can diagnose it, to make sure. You don't want to just throw parts like cats at it. That will nickel and dime you to death.

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12-09-2015, 06:11 AM

#18

techrep

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^^^THIS^^^ Cats are expensive

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12-09-2015, 07:33 AM

#19

sccowboy

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Is it possible that you could have an vacuum leak? Not that a vac leak would cause misfires all by itself but it could be contributing to the issues. Just a thought.