bakulatp

Hello all...2007 JK Rubicon Unlimited 116000 miles here....

Early this morning during my normal routine leaving for work I had a little situation with my jeep. Started it up, immediately the engine light turned on, dinged, and was idling very ruff. Backed out of the garage to get a better feel of what was going on and the engine continued to shutter when I shifted into first... Then a very strong gasoline smell started coming through my vents.

Turned it off and pulled the codes (P0206 and P0306). Sixth cylinder fuel injector circuit open and misfire.

I tried clearing the codes with my superchips flashpaq, hoping for the best.... restarted... same...

Pulled #6 Spark Plug find that it is swimming in fuel. Clean it and swap it with #4

Same... time to call in sick...

Then I spent the morning researching on here and concluded my sixth injector was stuck open somehow. Wiring possibly grounding out somewhere or a bad injector hopefully...

I manage to remove everything to get to the fuel injectors. Fairly easy job.

I figure its so early no auto part stores are open quite yet so I simply swap #6 and #4 injectors and hope to see if the problem moves.

While I was in there I clean everything pretty good with throttle body cleaner... everything within reason. I even lightly sprayed the injectors and wiped them with a clean rag (not sure if that's a good idea or not).
Cleaned Throttle Body, and even squirt out the upper plenum (FILTHY!) really good.

Get everything assembled back up, start the jeep, and it smokes like a mother effer. BUT running smooth and no check engine light.

I give it a quick drive around the neighborhood, the smoke fades, and still no engine light.


My question is ... WTF?

My hopes were for a bad injector, the problem moves to #4, and I throw a P0204.... easy fix...
Nope... instead all symptoms disappear...


Before this whole episode for the past summer my jeep has been idling eeehh... just a little spudder every few seconds or so, more prominent when the AC is on. Also there was hesitation when the engine was under load, such as accelerating up a hill, especially when my rpms were between 1400 and 1800... I couldn't roll through a stop sign in 2nd gear without the engine smacking me around...

In July I changed my spark plugs, wires, coil pack, cleaned throttle body, and ran Seafoam through the fuel system. The hesitation remained..

Am I on the right track? I spent Zero Dollars today and the jeep is now running just like it use to.
Is this normal for fuel injectors?

Baller44

Hi.

Thanks for the response. I will try that tomorrow morning. While I was checking the Cyl 4 Misfire (replacing spark plug and spark plug wire) I noticed smoke coming out of the Exhaust manifold. I took off the heat shield and noticed a crack. I know this is not causing my P0201-06 & P0304 codes but wanted to point that out. I will used JB weld to fix the crack as a temporary solution before I decide to buy new headers.

bakulatp

I seen those vapors too and found this thread....

https://www.jk-forum.com/forums/jk-w...osteel-229743/

I fixed my manifold this morning as well, and I still have not thrown any codes and engine is still running smooth after cleaning everything thoroughly.