02 Ranger with 4.0 misfire on #4 - 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 02-17-2011
Thread Starter
Join Date: Feb 2011
Location: Newport, me
Posts: 8
02 Ranger with 4.0 misfire on #4

Looking for some help on what direction to go. I used to work on automobiles in the days when electronic ignitions were just coming out. Gave that up to work on aircraft. After a few recent bad experiences with the local garages I have decided I will fully maintain my own.
My 2002 Ford Ranger recently kicked a P0304 code along with a noticeable miss from idle and during moderate acceleration. I used a simple reader to get the code. After some internet investigation I decided to change the 3 left hand side plugs and also swapped plug wires. I then used a spark tester that only gives a visual that the cylinder was firing. I compared it to another cylinder. Checked compression which was around 175, (comparable to adjacent cylinder.) Followed this up with replacing the 6 intake seals, cleaned and tested injectors, swapped injector 4 with another injector, cleaned all the carbon out of the intake which was a result of the dreaded pvc elbow that had cracked previously. I had taped up the elbow to get me by and forgot about which ended up collapsing. In the process of cleaning the intake out I decided to pull the valve cover and found the pvc check valve somewhat plugged and cleaned that as well. Through all this I had what I felt was quite a bit of oil present in the intake. i also cleaned the EGR up as well. After the second drive the code kicked again. So I went and bought an advanced code reader. Here is the FF info given:
RPM 1697
Load 58.0%
coolant 185
LTFTRM1 -2.3
LTFTRM2 -7.0
MPH 45
Fuel Sys Closed
So then I decided to take some readings at idle:
RPM 1054
Load 51%
MAF 1.12
Coolant 81
IAT 25
IGN Adv 15.5
02S11V .070
STFTRM11 1.6
02S12V .5
02S21V .75

As the engine warmed up several of these variables changed such as 02 information. I can also graph certain items though am still trying to wrap my hands around exactly what I am doing. I am guessing my bank trims are out of whack on the one side. I am in the process of studying and trying to get a better understanding. Any help or further diagnosis requests is appreciated.

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Old 02-19-2011
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Join Date: Feb 2009
Location: Hartford, WI
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What do you mean by left side? If you have a SOHC and you are looking for the #4 cylinder, it's the first one towards the front of the engine on the right if you are looking at it from the front.

Look at this diagram at the bottom of this page. http://www.explorerforum.com/forums/...d.php?t=303540
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Old 02-20-2011
Thread Starter
Join Date: Feb 2011
Location: Newport, me
Posts: 8
Left side from sitting in the drivers seat. Forgive me if this is different than what folks normally discuss here. In the airline world the left side is always as viewed from sitting behind the wheel to your left. It is standardized to stop this type of confusion. I agree that #4 is the forward cylinder closet to the battery.
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Old 02-21-2011
powerranger262's Avatar
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Alright, just wanted to make sure.
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