Engine misfires on #4, #5, and #6

[masq]

My car has taken a trip to the stealership 3 times now for misfires, and the techs can't seem to figure this one out! The entire bank is misfiring sporadically without giving clues as to what's causing it.

We've already replaced the coil packs, changed plugs, checked wires, and cycled through several tanks of fresh gas. However, still getting the misfires.

Now, is it the appropriate time to ask everyone about some other theories?

[masq]

I forgot to mention that the common suspects like O2 sensors were checked as well, even though there were no other codes indicating a faulty sensor.

[RFM]

MY, engine type and the present fault codes are the minimum info needed to answer your question.

[wross996TT]

injectors?

[dhale]

injectors?

I had a similar problem from a fractured catalyst in the catalytic converter.

[Loren]

MY, engine type and the present fault codes are the minimum info needed to answer your question.

I could not agree more - without the information above -- everyone is just taking wild guesses...

[masq]

so sorry, 2002 C2 Cab.

The codes that keep coming up are P300, P304, P305, and P306.

[Loren]

so sorry, 2002 C2 Cab.

The codes that keep coming up are P300, P304, P305, and P306.

I would put a PST2 or PIWIS on the car and check the Variocam on that side.

[masq]

the tech did check that before letting the car go. perhaps i should mention that the lifters were replaced before these misfires started showing up.

we cleared the code a few days ago, and now it seems to be running without codes showing up. should I just take this as one of those cases were the car just "fixes" itself?