Nightmare BIG TIME!! - Toyota Nation Forum : Toyota Car and Truck Forums

Germanguy · 09-02-2011, 07:33 PM

Evening all.
I have an intermitant problem.Engine hot or cold,the engine will start missfiring bad,its cutting on cyl 4.
I have a code #P0304 but NO engine light comes on.
To stop this shaking I have to stop and restart engine and then problem goes away.
Wiring,plugs are new.ECM good.
Its a 3.4ltr V6
Engine code is 5VZ-FE

Could engine coolant temp sensor or #4 injector be the culprit??

Cheers
Big Dan

jetwhine · 09-03-2011, 01:47 AM

Germanguy,

The first thing I would do is replace the #4 cylinder sparkplug. Then if it still misses then I would look at the firing circuit and then check the injector/replace. The ECT would effect all cylinders as far as I'm concerend. If you replace the sparkplug make sure you use only Denao or NGK, nothing else. No substitutes!

Germanguy · 09-03-2011, 10:42 AM

I will do that this afternoon.
It might take a day or so for the problem to appear! Hope it doesn't!!
I will keep you all posted.
Cheers
Big Dan