Error Code P0304

Error Code P0304

Postby woodhaven22 [OP] » May 26th 2009, 2:08am

Good-day,

I had posted a problem with my 2001 Astro AWD 4.3L van generating a error code P0304.

I used Seafoam and GM Fuel Treatment Plus.

I has been good all weekend and today it rained outside which now has caused this to happen again. Is their a sensor which is causing this problem? why would this only happen when it rains outside.


Thanks
Original Poster [OP]
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Re: Error Code P0304

Postby davesyo » May 26th 2009, 2:55am

Code po304 is cylinder misfire .Could be bad wires, cap , rotor , plug or coil.
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Re: Error Code P0304

Postby ihatemybike » May 26th 2009, 3:03am

How old is the cap and rotor?
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Re: Error Code P0304

Postby Mr_Bowtie » May 26th 2009, 3:10am

If it happens when its wet once it goes away you can take a spray bottle with water and spray it until you find the exposed wire or cracked coil or whatever is causing the miss when wet. (motor running/doghouse off)
Or to just band-aid the problem until it gets wet again you can spray the wires and coil and distributor down with WD-40.(4X4 guys don't leave home without it!) :mrgreen:
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Re: Error Code P0304

Postby woodhaven22 [OP] » May 26th 2009, 4:03am

I had everything replaced three years ago.

Does it seem like this could be the problem?

When this does come on, it really kills my gas mileage.


Thanks
Original Poster [OP]
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Re: Error Code P0304

Postby spongebob218 » May 26th 2009, 4:18am

P0304 is a cyl. #4 misfire. Could be a plug, wire, or cap. Being that it only happens when its wet, I'm guessing the plug wire for cyl. #4 or the cap is bad. Check those parts first.

Could also be an injector or a mechanical issue(burnt valve, etc), but highly unlikely given the symptoms.
You ain't nothin' unless you have green plugs.
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Re: Error Code P0304

Postby Leeann_93 » May 26th 2009, 3:10pm

If they're 3 years old, you need to inspect them. They tend to have problems with moisture getting under the cap when older and causing a no-start condition.
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Re: Error Code P0304

Postby adibv5 » May 26th 2009, 3:41pm

maybe your tank water gets in .... did you use that seafoam into the intake? i read around that might clean the engin good maybe helps.
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Re: Error Code P0304

Postby woodhaven22 [OP] » May 26th 2009, 10:57pm

Yes,

I used Seafoam in the PCV hose and pured a bottle of GM Fuel Treatment Plus.
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