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Rough idle

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Old 05-17-2016, 12:05 PM
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I thought I seen somewhere that the 4.6l didn't have vct solenoids? I may be wrong though, have looked at LOTS of info dealing with this.
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Old 05-17-2016, 12:15 PM
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You are correct, I was thinking 5.4. Scratch VCT
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Old 05-17-2016, 12:20 PM
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I seen that a catalytic converter just starting to go could cause it?

I am not quite ready to put an exhaust on yet!
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Old 05-17-2016, 01:17 PM
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If a cats plugged/clogged. A tell-tale sign will be glowing red after its been running for a while
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Old 05-17-2016, 01:24 PM
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First, I would change your Coils and Plugs. You can never be to sure.

Next, clean your throttle body and MAF sensor.

Another thing is to change your PCV valve. That helped a lot for me too!
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Old 05-17-2016, 01:52 PM
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I have done spark plugs, coils, throttle body (which cures the shutting off when coming to a stop), cleaned the maf sensor, 1 upstream o2 sensor, & fpdm.
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Old 05-17-2016, 02:42 PM
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Originally Posted by tomeal
I have done spark plugs, coils, throttle body (which cures the shutting off when coming to a stop), cleaned the maf sensor, 1 upstream o2 sensor, & fpdm.
OK...what about the other 2 things?

Clean the actual throttle body and change your PCV valve
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Old 05-17-2016, 03:01 PM
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I have cleaned the butterfly on the throttle body, the pcv I have not done. That's a nice inexpensive part to try.
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Old 05-17-2016, 03:07 PM
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Originally Posted by tomeal
I have cleaned the butterfly on the throttle body, the pcv I have not done. That's a nice inexpensive part to try.
For some reason I thought you were the OP but i guess you just jumped in on his thread. lol

The answer is for the OP too.

JT
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Old 05-17-2016, 03:24 PM
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Wasn't trying to hijack the thread, just thought the OP might benefit from what I have done already.
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