2003 tj. I6. Manual trans. Replaced plugs. Coil pack. Crank position sensor. Cam position sensor. Plugs. Injectors. Compression good. Still throws engine code. Cyl 5 missfire
2003 tj. I6. Manual trans. Replaced plugs. Coil pack. Crank position sensor. Cam position sensor. Plugs. Injectors. Compression good. Still throws engine code. Cyl 5 missfire
What plugs did you install? May we assume gapped properly and oem type were used?
There are a quite a few items that can cause misfires.
One item that is often missed during diagnosing is combustion chamber carbon build up on the piston top and in the valve area of the head.
You can either apply a continuous spray of MOPAR combustion chamber cleaner or Sea foam cleaner into the throttlebody for several minutes, shut off the engine and let sit for several minutes (follow application instructions on can) for quicker results or pour some Sea foam fuel injection system cleaner into the gas tank which will take longer to accomplish.
There was a TSB for the #3 cylinder misfire in 2004 4.0 engines which was wrapping insulation around the #3 fuel injector. I have a 2004 and had the same misfire which is heat related and wrapping the #3 injector with the below product (specified by the TSB) cured it. It is secured around the injector with a small zip tie.In for this as I just had a cylinder 3 misfire develop. Currently throwing a new mopar coil pack at it hoping for the best.
Ordered, thanks Jerry. What was the reason/rationale behind this TSB? seems like a weird fix.There was a TSB for the #3 cylinder misfire in 2004 4.0 engines which was wrapping insulation around the #3 fuel injector. I have a 2004 and had the same misfire which is heat related and wrapping the #3 injector with the below product (specified by the TSB) cured it. It is secured around the injector with a small zip tie.
https://www.amazon.com/gp/product/B007O3QHDK/?tag=wranglerorg-20
View attachment 346503
Heat from the exhaust headers rises up into the fuel injector/rail area and apparently the #3 injector was especially affected in the 2004 model year 4.0. The heat causes the fuel to vaporize/bubble inside the #3 injector. Heat soak can affect any or all of the injectors in various years but the #3 was somehow especially vulnerable in 2004.What was the reason/rationale behind this TSB? seems like a weird fix.
Heat from the exhaust headers rises up into the fuel injector/rail area and apparently the #3 injector was especially affected in the 2004 model year 4.0. The heat causes the fuel to vaporize/bubble inside the #3 injector. Heat soak can affect any or all of the injectors in various years but the #3 was somehow especially vulnerable in 2004.
I did the mopar combustion chamber cleaner. No result. Anyone have other options. Let me say this. I have another 03 tj. Been driving for years. No issues. This is a new purchase. Was cheap. Is a nice Jeep. Been sitting since 2014
The guy I bought jeep from was trying to fix it. Put. Cheap 50$ coil pack on it. It’s where I’m leaning now. Has anyone tried Ngk coil pack?
There was a TSB for the #3 cylinder misfire in 2004 4.0 engines which was wrapping insulation around the #3 fuel injector. I have a 2004 and had the same misfire which is heat related and wrapping the #3 injector with the below product (specified by the TSB) cured it. It is secured around the injector with a small zip tie.
https://www.amazon.com/gp/product/B007O3QHDK/?tag=wranglerorg-20
View attachment 346503
The guy I bought jeep from was trying to fix it. Put. Cheap 50$ coil pack on it. It’s where I’m leaning now. Has anyone tried Ngk coil pack?
It comes as a small sheet you wrap around the injector and secure with a zip tie.