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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 02-02-2008
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rough idle

i have and 03 ranger with 122000 on it, and since ive had it it has idled rough when sitting still. i recently took it to the shop to put it on the computer and they said i have a miss fire in 4, 6, and that it could be caused by either carbon build up or a valve problem. does anybody have any other ideas of what could cause the miss fires.ive changed the plugs and wires so far.
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Old 02-02-2008
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I would run some seafoam through the brake vaccum line. Then turn it off for about 10 minutes then start it up and drive around
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Old 02-02-2008
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why the brake vacume line?...and what exactly does sea foam do?
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Old 02-02-2008
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Old 02-02-2008
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If you've changed plugs and wires the only other thing you could have is a coil pack or a fuel injector. I am going through exactly the same thing right now with my truck and I'm at less than 71k. I did a compression test on my truck and cylinder 4 is at 125 psi and the others are over 175 so I definitely have a problem with the exhaust valve not closing on mine. I ran sea foam two days in a row and it works well but it didn't fix the problem in mine.
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