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Compression; Continuation of P0304 Misfire

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Old 04 Apr 2010, 05:51 pm
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Default Compression; Continuation of P0304 Misfire

I've had a P0304 cylinder #4 misfire for 3 mos now and have replaced plugs, wires, coil, upper intake manifold gasket and injector.... Idles a little rough here and there but runs great otherwise....

Just did a compression test; All cylinders are about 120pso except #4 which is 135psi...

What does that mean???

Thanks, Duff
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Old 05 Apr 2010, 09:16 pm
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Default Re: Compression; Continuation of P0304 Misfire

mine was the lower intake gasket on #4, most prone to go out. the upper was fine, but replaced it as well. On the #4 runner, it was missing a chunk.
2003 PT Cruiser GT- 15psi, 3" TTAB pipe, K&N drop-in, 3" downpipe, 3" downpipe back exhaust, tokico blues, boost gauge....breaking loose at 50mph
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Old 06 Apr 2010, 09:05 am
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Default Re: Compression; Continuation of P0304 Misfire

It means your problem is not valves or rings - that all your cylinders are just a little over being withing 10% of each other is a good thing.
Lower intake gasket is next logical target.
Spray starting fluid along intake seam - if idle smooths out, that confirms gasket.

Here's another with Lower gasket.
some PT GT problems Hesitation
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles

Last edited by quicksilverdon; 06 Apr 2010 at 09:08 am.
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Old 09 Apr 2010, 12:39 pm
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Default Re: Compression; Continuation of P0304 Misfire

I sprayed along the top of the intake; hard to get to the bottom gasket...NO change...

HOWEVER, when I sprayed the valve cover gasket (was changed a month ago), it choked and cut off????

What the heck is going on. How did that happen. I did NOT hit the electrical connection. Sprayed it at the #4 end of the valve cover.

Any suggestions other than retorqueing the vavle covers which I should have done a week after I changed it...

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