2002 ranger misfire rough idle

2002 ranger misfire rough idle

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Durham, NC

#1 Jul 27, 2007
rough idle and misfire on#5. have replaced plugs,plug wires,#5 fuel injector and coil pack. still have the problem. What's next?





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Since: Feb 07

Enfield, CT

#2 Jul 27, 2007
Compression check.... Pull the plugs and check compression. I would suspect that you have a stuck or burnt valve.....

Durham, NC

#3 Jul 27, 2007
Thank you Dave F
A compression test was done on all 6 cylinders.#1 185,#2 180,#3 175,#4 176,#5 175,#6 180. I was told that is good. Also not that it makes any difference, the truck only has 26,000 miles on it.


United States

#4 Aug 4, 2007
Have you tried checking the oxygen sensor

Pittsboro, NC

#5 Aug 4, 2007
Shaun wrote:
Have you tried checking the oxygen sensor
No I have not. Is there more than one and how would it be checked?

Pittsboro, NC

#6 Aug 6, 2007
grr wrote:
Thank you Dave F
A compression test was done on all 6 cylinders.#1 185,#2 180,#3 175,#4 176,#5 175,#6 180. I was told that is good. Also not that it makes any difference, the truck only has 26,000 miles on it.
Do you have more advice?

Middlesboro, KY

#7 Sep 2, 2007
i would check o2 sensors. I had the same problem and it was the bank2 o2 sensor. There are three senosrs on the truck, 1 on each header and one after the converter, autozone can read codes and tell you which one for free.

Since: Feb 07

Southington, CT

#8 Sep 4, 2007
OK, I'm running out of ideas here...... Check for vacuum leak possible at the manifold where it hits the head. You can check that with WD40, and the engine running just spray it at the junction if you see smoke out the pipe you have a leak. Don't know where you are located, but if you lived in CT, I could put my scope on your ignition and see how that plug is firing.... You haven't stated whether you have a check engine light or not. If you do then Auto Zone will check it for free so they can sell you parts....... LOL

I have been off line for a couple of days so I didn't see your post from a few days ago.....

Iowa City, IA

#9 Jan 24, 2008
I have a 2002 Ford Ranger, 4.0 V6. I have a similar problem, misfire on cyl. 6. Replaced plugs, plug wires, coil pack, and fuel injecter. Nothing has made it work. When the engine is cold, it will not throw a code, but as soon as the engine warms up, and I let it idle, it immediately throws the misfire code... I've had it looked at by 3 different mechanics and a ford garage, and no one really seems to have a clue to what it might be. Any ideas?
Ken in Maine

Beans Purchase, NH

#10 Feb 15, 2008
I am having this problum as well and no one seems to know whats wrong with it.
I have a 1996 Ford Ranget XLT 4cyl.
My truck is giving the code misfire in number 4 cyl.
I replaced my spark plugs, Wires, Coil packs (both of them) and all my fuil injectors with brand new ones from ford. and my truck is still shaking and tossing out misfire in cyl #4 code.
Once I get moving the code will stop blinking and then check eng light will just stay stedy on, but if i slow down it will act up again.
I also noticed on the passanger side of the motor I have sparks jumping out of the boot and grounding out on the head were the spark plug screws in. So I went back to were I got my wires and swapped them out with NEW ONES again. same deal.. any idea as to why that is happening?
Also any idea as to the mis fire?
If you need more info please ask ill respond.
Jon Mathews

Jeffersonville, IN

#11 Mar 18, 2008
chances are it is an oxygen sensor. They provide fuel flow regulation data that alters your air/gas mixture as it enters the cylinders. If any of the three (3.0L v6) go bad, the fuel/air mixture gets messed up.

Commerce, GA

#12 Mar 20, 2008
sounds like u need a tune up repalce all sparkplugs and wires make sure they are gaped corectly make sure they are motor craft and run a can of fuel inject clener check mass air flow seonsor

Commerce, GA

#13 Mar 20, 2008
a oxygeon sensor or 02 sensor will not make your car do that i unpluged mine and it didnt do that but i pluged them back up oxygen sensor only work when your car is is at it noramy temp

San Francisco, CA

#14 Apr 28, 2008
I am having the same problem with my 97 2.3 4 cyl. I get the OBDII code p0301 = cyl 1 misfire. I have also replaced all the plugs, wires, and both coil packs. No good. Recently my cat. began to rattle and eventually failed due to this problem. I was wondering if there was a ignition control unit or separate ECU that may control this? Any help would be good. Thanks

Whitmore Lake, MI

#15 May 20, 2008
I hope you already checked this My 2002 4.0 SOHC engine went crazy and only code was misfire cylinder 1 and Engine Lean. After replacing the plugs wires,plugs,egr sensor,fuel filter and valve MAFS sensor (disconected engine ran fine)
New vacuum hoses and PCV valve, turns out the air filer I relaced last year, got tore from it's seal and jammed into the air tube. runs like new now.
I should have checked it first!

Fairburn, GA

#16 Jun 21, 2008
I have a 2000 4.0. 132000. My truck runs rough only at idle. I've also seen the other codes bank 1 lean, bank 2 lean, and now I'm getting #3 cylinder misfire. Are there any new ideas to the fix?

Clayton, NC

#17 Aug 20, 2008
help i have a p1537 code for ford ranger 2002, 2.3 5speed. truck runs like a champ but that damn engine light is on. military guy who needs to pass this inspection in nc. what should i do so i wont get ripped off. help please...

United States

#18 Nov 22, 2008
Very helpful thread here. I don't believe in replacing parts willy-nilly. Sensors, etc. cost money. My '97 Ranger has codes for cyl. 4 misfire and bank 1 lean. These only after 145,000 mile tune up: replacing top engine gaskets, new plugs, wires, packs. New fuel pressure regulator.

Decent compression and fuel pressure, runs dog-rough and weak. Will start checking for air leaks from air-in to First O2 sensor. If it will run better (good history with this vehicle) I like black electrical tape for that pesky MIL!

Nampa, ID

#19 Nov 23, 2008
ExtraPartsUhOh, I would bet 10 backs it's your injector got clogged. If you don't believe in changing parts, try to clean it in ultrasonic cleaner. I cleaned mine (my buddy got really good ultrasonic cleaner in his business), and they served me another ~30K miles. Two got hosed again and I'm gonna change them this time. If you got a buddy with injector tester, you can test them before and after cleaning. If you don't, then schmart schmecanic from auto schop is gonna charge you as much as new injector cost on internet (~50 bucks on rockauto).
If you do nothing, then it will get worse to the point that ride would get rough... won't get stranded, but one cylinder running lean will start getting pinging... you may go to higher octane to help lean cylinder out.

Atlanta, GA

#20 Nov 26, 2008
I have a 2007 ranger sport and i have a missfire on the #5, i've taken it in and the dealership says it briefly apears but goes away after a while, its scheduled to in again this saturday but now i know this is a fairly common problem and ill let you guys know what they say

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