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Old 05-06-2016, 04:57 PM   #1
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Default Question about P0204,P0300,P0304 OBDII codes

Hi.

im trying to solve the p0204,p0300,p0304 obdII codes

i already changed the spark plugs, the coil packs, and the injector, but the problem is still there.

what can i do?.

also the engine has this turbo like whistle when you accelerate it, i dont know if its cause of a mini crack in the air intake hose.

the car is an impala ls 2000 V6 3.8

Last edited by danihound; 05-06-2016 at 04:59 PM.
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Old 05-06-2016, 05:07 PM   #2
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Does this have anything to do with a coolant leak and cracked manifold, and no start condition? How come we aren't updating your 3 other threads?
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Old 05-06-2016, 05:08 PM   #3
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Bad connection to the cylinder #4 injector, or a bad injector. Try switching injectors and see if the problem moves to another cylinder. If you already changed the injector, use a noid light to check for signal. A simple noid light can be made with an 1147 bulb (or any other 12V auto bulb that has leads that can be straightened out), and straighten the leads out so they can be inserted into the connector for the wire feeding that injector.
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Old 05-06-2016, 05:16 PM   #4
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Quote:
Originally Posted by Mike View Post
Does this have anything to do with a coolant leak and cracked manifold, and no start condition? How come we aren't updating your 3 other threads?
ah true, let me update those.

the car does start,, i do not have a cracked manifold, but theres a radiator tank leak.
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Old 05-07-2016, 09:37 PM   #5
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update:

looks like the 4th cylinder has low compression, need to test it first.
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Old 05-08-2016, 11:05 AM   #6
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You have a random misfire on all cylinders, and its seeing more misfire on cylinder #4. Looks like it might be sucking coolant in. Unless your last tuneup was 6 million miles ago.
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Old 05-08-2016, 11:13 AM   #7
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You have a random misfire on all cylinders, and its seeing more misfire on cylinder #4. Looks like it might be sucking coolant in. Unless your last tuneup was 6 million miles ago.
i suspected that too.

should i change the gaskets then?, since i need to import them from the usa (im in venezuela) is there anything i can do meanwhile?, i was watching in youtube those additive that "seal" the gaskets, do they work?.

as this rate i will probably buy the whole reconstruction kit, i would go for a whole new engine but thats extreme.
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Old 05-08-2016, 11:19 AM   #8
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Buy the complete upper gasket kit. Lower manifold and the upper manifold gaskets, coolant elbows etc.

Gasket sealer? You mean the stuff that you put into the cooling system?

Nothing you can do but replace all the upper gaskets. They can not be repaired, mended, Jerry Rigged, African Americanized, fixed, band aided etc.
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Old 05-08-2016, 11:19 AM   #9
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But, I'm just speculating the coolant being sucked in. Check your oil level and any coolant consumption.
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Old 05-08-2016, 11:21 AM   #10
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Quote:
Originally Posted by Mike View Post
Buy the complete upper gasket kit. Lower manifold and the upper manifold gaskets, coolant elbows etc.

Gasket sealer? You mean the stuff that you put into the cooling system?

Nothing you can do but replace all the upper gaskets. They can not be repaired, mended, Jerry Rigged, African Americanized, fixed, band aided etc.
thanks, well time to spend some money.

i will see the products in rockauto.

also mike, the car has 117 k miles, how many miles can that engine take after the gasket replacement? im thinking about selling it.

Last edited by danihound; 05-08-2016 at 11:23 AM.
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