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Code PO304

Tiny
MAMADETTE4
  • MEMBER
  • 2007 SATURN VUE
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
Replaced coil on cylinder 4. Put new spark plugs in it. Then we were getting the misfire for cylinder 1, 2, and 4. Drove it a little more than only got the misfire on cylinder 4. What could be causing this? It is driving my other half crazy.
Wednesday, November 3rd, 2021 AT 10:10 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The first thing I would do is check the compression to be sure the engine is good.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-engine-compression

Then I would test the fuel pressure. You need to be sure sufficient fuel is getting to the cylinders.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Fuel Pressure (Key ON, Engine OFF) .................... 330-382 kPa (48-56 psi)

Roy
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Thursday, November 4th, 2021 AT 2:35 AM

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