P0306. I KNOW IT'S A #6 CYLINDER MISFIRE?

2004 Chrysler Town and Country

Tiny

jvrbka

October, 4, 2012 AT 3:35 AM

My wifes Town and Country has check engine light on. The code it p0306. I know it's a #6 cylinder misfire, but I can't figure out why it is misfiring.

The engine light is on. P0306. I've changed the plugs, plug wires, coil pack, and fuel injector, and the light is still coming on. I don't know where to go from here. I thought maybe fuel pressure was low and because the #6 cylinder is the last one on the fuel rail it's not getting enough pressure, but I can't figure out how to test it.

There is no scrhader valve anywhere. I've had the fuel rail out when I changed the injector and there isn't a valve on it to hook a fuel pressure gauge to. How do you check fuel pressure on these engines and is there any other ideas as to what could be causing the misfire?

Thanks!

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15 Answers

Tiny

saturntech9

October, 4, 2012 AT 4:04 AM

Does it missfire constantly or just sometimes.

Tiny

caradiodoc

October, 4, 2012 AT 4:07 AM

Fuel pressure can't be any different at the various cylinders. All the injectors are fed from the same large tube. I have to guess at the engine size. The 3.0L doesn't use a fuel pressure test port. You pull the supply hose off and insert a tee with a fitting.

You might consider a compression test. Chrysler typically has extremely little trouble with injectors. The spark plugs and wires normally solve 95 percent of misfires, injectors and fuel pump about one percent.

Tiny

saturntech9

October, 4, 2012 AT 4:13 AM

Thats where I was going is compression thats why I asked if it miss fired constantly?

Tiny

jvrbka

October, 4, 2012 AT 5:19 AM

It's a constant misfire. The engine is the 3.8l. So the next step should be to check compression?

Tiny

saturntech9

October, 4, 2012 AT 5:34 AM

Yes if its constant I would check the compression.

Tiny

jvrbka

October, 4, 2012 AT 10:49 AM

If the compression of that cylinder is low, what do I do after that?

Tiny

saturntech9

October, 4, 2012 AT 3:05 PM

I would check all the cylinders compression and if only the number 6 cylinder was low.I would suspect a valve issue. Then I would do a cylinder leak down test to pinpoint if that's what it is.

Tiny

jvrbka

October, 4, 2012 AT 3:07 PM

Ok. I'm going to try and get a compression gauge tonight.

Tiny

saturntech9

October, 4, 2012 AT 3:51 PM

They rent them at auto zone.

Tiny

jvrbka

October, 6, 2012 AT 3:54 AM

Finally got a compression gauge that works. The first one I got had a small hole in the hose, so I had to take it back. The #6 cylinder only had a psi of about 100. The others were around 150. I also poured about a capful of oil in the #6 plug hole and it was still reading about 100 psi.
Where do I go from here now?

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