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0300 Just will not go away...

 
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  #1 (permalink)  
Old 30 Jul 2010, 08:33 am
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Default 0300 Just will not go away...

Hi - I have a 2004 PT Touring Convertible Turbo with 78k miles.

I have slowly been fighting and replacing things - new battery, new plugs, new plug wires and new oil.

The odd thing is that the 0300 will disappear for a bit, sometimes after I Seafoam the car - other times just because. However it is now hanging around like a persistant cough and just will not go away.

Any ideas for what to check next? The engine runs really smooth under load but the idle is rough after you first start it or if you wait a long time at a light and there is a little jumping from the car when you release the brake if you have been at a stop.

I am beginning to wonder if I have got some plugged fuel injectors or something.

Ideas?
Thanks!
Pat
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Old 30 Jul 2010, 09:48 am
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Default Re: 0300 Just will not go away...

Pat,

You are taking the negative battery cable off for about 10 minute to clear the computer of the old code, right?

P0300 without a 301, 302 etc. could possibly be a coil problem but we haven't seen many of them on the forum. The injectors are more likely your problem because they would show up more under idle conditions than under load. Try a heavy dose of injector cleaner like Techron from Chevron to see if that clear it.
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Old 30 Jul 2010, 11:51 am
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Default Re: 0300 Just will not go away...

Thanks - I haven't removed it lately - but I will give it a try. I thought that after 3 "good" runs the engine lights cleared themselves... hmmm

Thanks!
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Old 30 Jul 2010, 12:29 pm
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Default Re: 0300 Just will not go away...

No, there's only a couple codes that clear themselves and one is the gas cap (if it's not tightened properly). Not sure of the other ones, but most have to be cleared by taking off the cable.
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Old 30 Jul 2010, 02:16 pm
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Default Re: 0300 Just will not go away...

The 0300 is a general misfire, not specific to any one cylinder....
90%+ times it's the wires/plugs, next is intake gasket - trick is to spray WD-40 along intake manifold seams - if idle smooths out, it's gasket. Next is injector - usually only one gets clogged - cleaner sure can't hurt.
Lastly, the coil - but you say you changed that.
Hope you gapped plugs at 0.040 - that's the new recommended gap, but unless you're way off. I doubt that'd be it.
Double-check both ends of wires - I found them hard to get seated - took a good push.
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Old 30 Jul 2010, 02:30 pm
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Default Re: 0300 Just will not go away...

Just to check - and be very newbie about it -
The manifold is the engine piece that has 5 screws at front and 2 at back that I had to remove/lift up when doing the spark plugs...
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Old 30 Jul 2010, 02:50 pm
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Default Re: 0300 Just will not go away...

Yes, but on mine there were 3 at the back that attached the upper manifold to the throttle body. That might have changed in 04.
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Old 30 Jul 2010, 03:41 pm
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Default Re: 0300 Just will not go away...

Hmm - it was late when I did the spark plugs but I dont remember seeing a gasket... I thought that was odd... I will do the wd40 test and mayve check again. I looked and Autozone has the gasket for $7... so I will just have to laugh if this is part of the problem.
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Old 30 Jul 2010, 03:53 pm
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Default Re: 0300 Just will not go away...

The intake gasket(s) that QSD is talking about are the 4 oblong rubber type gaskets that are at the bottom of the intake runners. They fit into recesses and will stay attached to the bottom of the intake when you lift it up to get at the spark plugs. I guess if you weren't looking for them, you could miss them. They can be used over and over again as long as they are in good shape. Mine were red in color. One of them cold easily drop out of the recess and if you didn't notice it would certainly cause a vacuum leak.
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Old 30 Jul 2010, 05:16 pm
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Default Re: 0300 Just will not go away...

On the 2006's like all of the other NA PT's the gaskets are red oblong. 3 bolts in front and 2 to the rear of the intake manifold.
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