pulled a code saying misifre at #4 cyl. - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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  #1  
Old 01-05-2008
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pulled a code saying misifre at #4 cyl.

What could cause a misfire on my #4 cylinder? I do have a stuck lifter, but not sure where it is, if it is at my #4 cylinder could this cause a misfire? What else could I check?
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Old 01-05-2008
04 EDGE
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the first thing i would check is the spark plug, then the wire
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Old 01-05-2008
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Odds are it's either a plug, a wire or a fuel injector. In my case I believe mine is a leaking fuel injector since I have a #4 misfire right now as well. I just haven't gotten around to fixing it. Mine runs great at high speed but misses and pops at idle.
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Old 01-05-2008
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Quote:
Originally Posted by 67cobain94
Odds are it's either a plug, a wire or a fuel injector. In my case I believe mine is a leaking fuel injector since I have a #4 misfire right now as well. I just haven't gotten around to fixing it. Mine runs great at high speed but misses and pops at idle.
Thats exactly what mine does. at idle its rough, any kind of acceleration smooth as a boob! Ill check everything mentioned and get back to all of you.
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Old 01-05-2008
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How do you check a fuel injector anyway??
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Old 01-06-2008
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Quote:
Originally Posted by 2000ranger4x4
What could cause a misfire on my #4 cylinder?
On the 4.0 OHV engines like yours, it is possible to get a coolant leak into the #4 runner where the lower intake meets the cylinder head. If this is your problem, then new gaskets should fix it.
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Old 01-06-2008
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Quote:
Originally Posted by rwenzing
On the 4.0 OHV engines like yours, it is possible to get a coolant leak into the #4 runner where the lower intake meets the cylinder head. If this is your problem, then new gaskets should fix it.
I have the 3.0 flex motor.
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Old 01-06-2008
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Quote:
Originally Posted by 2000ranger4x4
I have the 3.0 flex motor.
In that case, you should look at ignition and injector for #4 or a local vacuum leak that primarily affects #4.
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Old 01-06-2008
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My old truck was a 3.0 flex and I kept getting a #6 missfire and it ran just like you described but mine turned out to be a sticking valve cause sometimes it would idle fine and others it would idle rough.
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Old 01-06-2008
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Could you guys describe to me HOW I would go about checking the things like vacuum, ignition, injector??
I really have no real clue on these things.
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  #11  
Old 01-07-2008
pehlke1985
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I have a 99 3.0 Flex and i had a misfire on #4 as well but mine turned out to be a head gasket leaking exhaust into my coolant and eventually made my coolant res. constantly blow from the pressure!!! Look in your res. and see if there is any brown matter that looks like silt on the bottom!!!
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Old 01-07-2008
pehlke1985
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I forgot to add it was just a tiny lil pin hole on the exhaust port that caused this and if you do head gaskets make SURE that you get the longer flex fuel head bolts my auto store screwed up my whole order!!! lol
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