When I swapped the injectors between cylinders a couple weeks ago there was no dirt or grime past the o-rings on any of them. They looked good/clean.
Up until this weeks episode, it only missfired when the engine was warm, and got significantly worse if I was driving around town for an extended period of time. After I replaced the spark plugs (that were only 6 months old)it ran like new. Now after 2 weeks of it driving fine, it has started acting up again, but now its missing from the second I crank it up in the morning. It makes me think that it was coincidence that it stopped when I changed the plugs. Because of the history of this problem over the last 8 months (only missfires for a few days then goes away as randomly as it started). But now that it is coming and going every few weeks instead of every few months, it makes me think that I have a part/sensor on its last leg thats either about to or already has completely burnt out or failed. During the older episodes, it acted up more at half to full throttle and was fine at lower rpm's. Now any throttle, unless absolutly babying it, makes it act up. And if it helps, after I ran the AC for 10 min the other day the misfire got almost twice as bad even after I turned the AC off and has stayed this way.
I have too much pride to take it to a shop, and I am very mechanically inclined, but this issue has me stumped.
SO. The plugs are new/look good, there is a new coil pack on the current problem cylinder, the injectors looked good and were swapped around, and I've owned this truck for over 2 years of its 5 year life and put over half the miles on it and have taken good care of it during this time.
Anyone have any personal experiences with this SUV/motor that might stand out in this situation? Or any other ideas?
Wednesday, November 17th, 2010 AT 2:54 AM