OK about 2 weeks ago did my timing belt, 3.0 btw. I think it was off 1 tooth possibly drivers side. It ran fine for 120 miles then check engine light comes on flashing. Scanned it and found misfrie in cyl 4,5,6. Ok took it apart again, re timed it and now i'm dead on. Put it together, still having a misfire. When it goes above 2k rpms i hear the misfire. So I bring it to the dealer, they check everything and tell me the only thing they found was during the leakdown cyl 4 has 35psi less than the others. Why does the car not stumble at all when it misfires, the only reason I know it misfires is because the check engine light blinks. All 3 on 1 side though? I scoped the cylinder and didn't see any marks but alot of carbon. Someone told me it might be possible that the flexible cross over line in the back of the fuel rail might be coming apart on the inside and there is dirt going to the injectors. I swapped the injectors over to the right bank, no change. Cleaned the fuel rails and rubber fuel line out aswell. I;'ve noticed that when I am light throttle or off completely is when I get the misfires. There is no freeze frame data stored and its still on only those 3 cylinders. Plugs,coils, and timing are fine. What is the deal???

 

PS-- The MIL light blinks at part throttle and under load it stops and just a check engine solid is on

 

on that right corner is where the misfire is..... it could be a small air leak through your gasket on that side ......... do you just put a gasket on (with no silicone sealant?) as some do not it the valve cover tighten down to TQ pounds ???
I missed my right corner one time and all the new plugs burned up....... you talk about misfires....

 

Actually the dealer just put a new gasket on and torqued the bolts. It's not just that corner its the whole side, cylinders 4,5,6 misfire P304,P305,P306 and P300

 

the dealer could have screwed up because that sounds exactly like what has happened !!!!!! take it back have them check

 

Yea but it was doing it before the dealer, when i put a new gasket on and I tightened it down real good. The other side should be leaking and misfiring too then

 

They keep saying maybe I bent a valve but it runs too good for there to be a bent valve. Is there an ICM on these engines? Could that be bad??

 

if the leak is on one side it can burn up before it reaches the other side

 

sounds like a coilpack. have u changed them or know if the previous owner has changed em. There is a recall out on coilpacks. Might want to notify the dealer u are aware of this and have them check it out. orrr u can go to ecstuning and go buy ur own and swap them out in about 10 minutes.

 

I second the coilpack... happened to me