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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 06-02-2010
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Truck trying to cut off while idle

While idle, Every 30 seconds or so, my engine drops a couple hundred rpms for about a second, like it is about to cut off. It then regains its rpms, and all is fine. I didnt notice this problem until after my body lift and super 44. Im not sure what the problem could be.
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Old 06-02-2010
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Oh and to add. After the muffler and BL, i noticed a loss in power. Could this be a backpressure issue?
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Old 06-02-2010
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Did you get bigger tires...? as the loss of power

And how large did you go on the pipes?
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Old 06-02-2010
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no new tires...yet. pipe runs 2 1/4 from dual out muffler, dumped after rear axle.
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Old 06-03-2010
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Also i lost some throttle response. I even zip tied the slack in the cable.
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Old 06-15-2010
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bump. any idea guys? Truck lacks some guts and snappyness i had before the bl and exhaust.
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Old 06-15-2010
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just a thought what about the plugs or your maf just a thought to help
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Old 06-16-2010
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Well if it ran fine before you did that stuff, its a pretty good chance that changes you made caused the issue. I don't know about pipe size, but is that too big possibly and causing back pressure issues? Did you look up stuff about what pipe size to use before you did it?
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Old 06-16-2010
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Actually I've noticed the same thing happens to me when I sit on a steep incline. All of a sudden every couple seconds it will drop to a sputter then kick back up.

I've never figured it out
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Old 06-16-2010
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The pipe size is the same I have from muffler back with no problems. More than likely a sensor was damaged or unplugged while doing the body lift. Changing a muffler won't create idling issues. Your lose of power is most likely caused by the idle issue... Which is probably a sensor of some sort
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Old 06-16-2010
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Quote:
Originally Posted by ranger4.0 View Post
The pipe size is the same I have from muffler back with no problems. More than likely a sensor was damaged or unplugged while doing the body lift. Changing a muffler won't create idling issues. Your lose of power is most likely caused by the idle issue... Which is probably a sensor of some sort
Im not too knowledgeable about sensors. Where do i start?
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Old 06-16-2010
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Quote:
Originally Posted by redman89 View Post
Well if it ran fine before you did that stuff, its a pretty good chance that changes you made caused the issue. I don't know about pipe size, but is that too big possibly and causing back pressure issues? Did you look up stuff about what pipe size to use before you did it?
Yeah. I only have the pipe 1/4 of an inch bigger than the previous setup. And it only has about a foot or two less of pipe than before (its dumped) I need an all around checkover i guess.
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Old 06-20-2010
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Changed the fuel filter (i dont know how long the last one had been in there) I planned on changing plugs the other day. Nobody had motorcraft plugs (out of 4 stores). Anybody know of best plugs for our 4.0 SOHC?
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Old 07-02-2010
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Idle Air Control on my truck was shot, made it bounce around at idle and the truck wouldn't take off very fast but would suddenly get power after it fell on its face. IAC for short. Ontop of throttle body
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Old 07-02-2010
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Idle Air Control on my truck was shot, made it bounce around at idle and the truck wouldn't take off very fast but would suddenly get power after it fell on its face. IAC for short. Ontop of throttle body
Did you replace it? If you did how much did it run you, and did you replace it yourself?
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Old 07-02-2010
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Quote:
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Did you replace it? If you did how much did it run you, and did you replace it yourself?
I replaced it myself it was a 40 dollar part at O'Reiley Auto Parts. It is held on by 2 small 10mm bolts I think.
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Old 07-09-2010
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Still learning here. Which plug is the MAF? I see two line running out of the intake rite after the box with the filter. I unplugged one of them from the intake, and the truck ran like CRAP. These is another weird plug/hose thing further down....what is that?
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Old 07-09-2010
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The one you unplugged would be your maf plug the other is the crank case vent
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Old 07-09-2010
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Is it supposed to run like that when you unplug it?
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Old 07-09-2010
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Yeah it will
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  #21  
Old 02-20-2011
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So what ever happened with this??? I just put a BL on my ranger and having a similar problem. I was thinking it has something to do with the filler neck splice...
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Old 02-20-2011
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I completely forgot about it. I havnt noticed it recently though.

I just recently threw another evap code though. I was thinking about lubing the filler neck splices with a little bit of tranny fluid.

Other than that, I might have to take it in for a smoke test. My next door neighbor is a mechanic, so I might as him first.

Now that I re-read this, I might check my IAC (I never did).
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  #23  
Old 02-20-2011
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Actually, my problem was a little different than what I first thought... It idles fine, but as soon as I hit the gas it just bogs down(no check engine light or codes). I was thinking of pulling the bed and making sure my connections are good and tight on the filler neck. Thinking maybe it has a loose line and sucking some air.
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