Has anyone got an answer to this yet? I have a 2004 GC (72k miles/6 cyl) and I noticed a few times in the last month it seem to stumble while sitting at lights. Last night on a road trip through the VA countryside it started missing at random intervals but not badly. This went on for 30-40 miles intermittently and then things got BAD. It started really running rough and the engine light came on and just a few minutes later started blinking (the manual says "imminent loss of power"
) and it was barely running. This happened in a matter of a few minutes. I limped a few miles back to a dealer shop and shut it down.
This vehicle has been pretty well maintained and I had expected to tune it up soon. It's always had fuel injector cleaner dumped in it at every oil change. From the way it was running, I had definitely lost one, maybe two cylinders and I didn't need an error code to tell me that. It just had the O2 sensors replaced about 10 months ago also.
Does anything think this is just an injector failure or worst-case, a head gasket? The oil pressure and temp were all ok and I didn't appear to blowing anything putrid out the exhaust but it was dark. I was just shocked at how fast the situation degraded.
If anyone has any previews on what I can expect, thanks in advance. I will post the conclusion when I get the [presumably] bad news.
UPDATE: So this turns out to be exactly what I thought - a bad injector. They found some corrosion in there too which chaffs me a little since I don't live near any saltwater. Anyway, 400 bucks for the new plugs which I was going to do anyway and the injector repair which would have gone out anyway. I was just lucky I was driving past a shop when it got bad.
Reading some of the others posts, I see that the fuel rail on these runs at 40psi which seems a little extreme and probably contributes a lot of stress to these parts and the quickness with which they reach complete failure after a small problem starts. Who thought that was a good idea, we'll probably never know.