2003 4.0 sohc Ranger runs rough - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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Old 03-16-2012
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Icon8 2003 4.0 sohc Ranger runs rough

I just bought a 2003 Ranger with a 4.0. It was tagged as bad motor/ dead cylinder. I drove it home but runs very rough. The engine temp was fine, the oil pressure good. It had a couple of codes P2195 O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 and P0171 system to lean bank 1. I cleared out codes ran engine some more and cel came back on with p0171 and p0174 which are both lean conditions for 02 sensors. I checked fuel pressure about 65/70 lbs running. I have changed coil, plugs and wires. it is a little better but still runs very rough.I used my timing light to check spark on each wire and 3,4,5,6 all had a good flashing light. 2 was sending morse code, and 1 did nothing that was before I changed plugs and wires, after changing cyl 2 flashed ok like the rest and still nothing on cyl 1. I checked for a cracked vacuum hose did not see anything, I sprayed starting fluid/ brake clean all around with motor running and no change.

Any help would be great and what direction to go next
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Old 03-16-2012
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Did you replace the 90 degree intake elbow right below the throttle body, under the top rad hose? The OEM ones crack at the angle. Try swapping it out to see if it does the trick
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Old 03-16-2012
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for the pcv hose?
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Old 03-16-2012
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No...I replied to the pm though
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Old 03-16-2012
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coil pack?
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Old 03-16-2012
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yeah sounds like coil pack. if nothing is igniting on #1 then its not getting power. no spark = no flame.

even at the most basic level changing the coil pack never hurts
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Old 03-17-2012
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Already did coil pack before plugs and wires
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Old 03-19-2012
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ecm
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Old 03-19-2012
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I was wondering about the ecm if that would cause a dead cylinder
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Old 03-20-2012
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I don't have the 90 elbow that Clinton was talking about. I have 2003 4.0 SOHC
Anyone have other idea's
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Old 03-20-2012
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is it getting fuel?
injector clogged or not working?

Correction: but you state cyl 1 is still not firing. after plugs and wires? my guess is control module
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Old 03-20-2012
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Would ecm set a code?

I have 65-70lbs fuel pressure with engine running.
New coil, plugs, wires
When I use my timing light and clip to each wire I get no light flash off #1 before plugs and wires #2 was flashing like it was sending morse code and now flashes like others.
I used noid light to check injector pulse on #1 and it was flashing.
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Old 03-20-2012
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my mistake-just misunderstood. so you are getting response from injector and cyl 1 now that you did the coil wires and plugs. so it is getting receiving a signal. timing is not adjustable so its not like its firing at wrong times.. sorry just thinking aloud lol.

i suppose the next step is to get a compression test. timing is not adjustable so its not like its firing at wrong times..

just if you were curious on the specs for fuel pressure-the 03 ranger 4.0 is 64psi +/- 8
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Old 03-20-2012
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Quote:
Originally Posted by jhbuild1 View Post
I don't have the 90 elbow that Clinton was talking about. I have 2003 4.0 SOHC
Are you sure about that. My 2002 4.0 SOHC engine has that rubber 90 elbow that connects to the hard PCV tube under the top radiator hose. Mine cracked and caused it to idle rough and would die if idled too long. Replacing it resulted in a smooth running engine again.
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Old 03-20-2012
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He said it was not the 90 for the PCV. I have sprayed starter fluid, brake clean all around and no change
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Old 03-20-2012
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yes you have the elbow, but I don't think its your problem, when mine went it just kept wanting to stall out. but you could squeeze it and make sure its still good ....
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Old 03-22-2012
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Sounds like couple of dead cylinders. cly 4 has spark and pulse to injector but when i pull harness connector from injector nothing changes? any other thoughts
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Old 03-23-2012
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are the cats clogged? check the exhaust and make sure its flowing freely.
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  #19  
Old 03-25-2012
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I have a 97 with the 4.0L and its running similar, I just cleaned the throttle body, MAF and check all hoses. I have a few...O2 upstream codes, I also had some O2 sensors replaced and thats when I started to have this problem.

Think your truck could be having similar issues? Any codes getting thrown?
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Old 03-25-2012
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Might be a silly question, but have you changed the fuel filter?
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  #21  
Old 03-25-2012
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Yes I was getting a p0171, p0174, and had a pending p2195
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Old 03-25-2012
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Changing fuel filter tomorrow
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Old 08-25-2012
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It was a broken exhaust valve stem on cyl 1,
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