ok here we go. 2008 Sienna with 115,000 on it. CEL came on and read misfire so I decided to change the spark plugs cause they were at about that point. Boom problem solved for 2 days, then CEL came on again. Once again random misfire, and misfire on I believe 4 and 6. So I figured coil packs. Instead of having them go one or 2 at a time I just did all of them. Problem solved for about a week, then CEL on again, random misfire, and 4 and 6. But this time the CEL started flashing and had a total loss of power like it was running on less than 6 cylinders. shut the van off and turn it back on and all power is resumed but CEL light is on solid. oh and the only time it starts to flash is when its cleared, then it will drive for a few days or it seems like only on longer trips it will go off and start flashing, but if I pull over shut it off then turn it back on its solid but runs fine. Any ideas would be helpful and thank you in advance.

 

So much crap on these new cars it's just easier to let the dealer diagnose.

:wabbit2:

 

-Possible timing belt skipped a few teeth if it has one... forget if an 08 sienna does or not...
-Possible Variable Valve timing solinoid fault bank 2.
-Oil in spark plug tubes?

 

Well I scanned it again and it came up with misfire on 1,2,5,6 and I have noticed it using some oil, where would I start for that I think your on to something here.I plan on taking the front plugs out tonight to look at them