So I filled up with premium on my way home from a trip Saturday and noticed a miss at full throttle/boost as soon as I got back on the highway. No check lights came on and driving conservatively is just the same as before. Can bad gas do this? It is a nice station on a major interstate so it is doubtful that it was old fuel. Maybe a fuel filter that just clogged at that exact time?
no suggestions?
Coil packs maybe. Do you have a scan tool that can read miss fires? If so see if they follow the coil pack from cylinder to cylinder.
Did it clear up after a mile or two?
There was a maintenance bulletin for my 2005 (!) Chrysler Town & Country last year that caused me to get a free fuel pump sender assembly. It was the same thing, although it could result in the engine shutting down. If I recall, it was due to a vacuum lock that could happen with the return if the tank got overfilled somehow, but I don't have my VIN handy so I can verify the details, but after 1/4-1/2 mile, it would clear up and stop stumbling.
Failing coil pack or old plugs/plugs gapped too wide.
Since it happened right after a fill, I'd throw in some octane booster. I've had this happen at an interstate fillup. If the car is reacting to knock, it may feel like a miss. Any check engine lights?
Then I'd be looking at plugs, then other ignition stuffs.
No check engine light or anything else. It has been a bit since I changed the plugs but probably only 40-50k, nothing insane.
I will try the octane boost. I went and filled the tank with fresh fuel once I burned off half a tank.
You crazy. And while I want to say ignition, I think the "just after filling up" part is pretty important and shouldn't be ignored. I wonder if these cars record ignition events that can be read with a scanner from history. Otherwise knocks might be indicated in real-time if you can re-create the condition.
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