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 Post subject: OBD II P0300 with P0404
PostPosted: Sun Dec 17, 2006 9:28 pm 
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Joined: Sun Dec 17, 2006 9:16 pm
Posts: 2
Location: Illinois
2002 Chevrolet Impala. It has set two codes P0300 and P0404. The car is running rough and has no power at low RPM's and it seems to regain some of its life at a higher RPM but not at all normal. It sounds like it might be PINING at higher idel speeds. The Plugs and wires were new 6 months ago and it has a fairly clean air filter, Thought I might statr with a fresh fuel filter and check out the EGR.


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 Post subject: OBD II P0300 with P0404 
PostPosted: Today 
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Joined: 29 Jun 2004 08:12 pm
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PostPosted: Mon Dec 18, 2006 11:13 am 
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Joined: Tue Jan 10, 2006 2:09 pm
Posts: 6055
Location: Kingston Ontario Canada
3.1 ? Likey the EGR is sticking or the port through the throttle body is plugged Fuel filter won't fix it!


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 Post subject: chevrolet Impala codes P0300 P0404
PostPosted: Mon Jan 15, 2007 5:53 pm 
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Joined: Sun Dec 17, 2006 9:16 pm
Posts: 2
Location: Illinois
The fix for this was a calalitic converter.


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PostPosted: Mon Jan 15, 2007 6:12 pm 
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Joined: Tue Jan 10, 2006 2:09 pm
Posts: 6055
Location: Kingston Ontario Canada
how?


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PostPosted: Mon Jan 15, 2007 8:33 pm 
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Joined: Sun Oct 15, 2006 11:36 am
Posts: 22
The new convertor probably fixed the P0300 code but it's likely the EGR code will come back.


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PostPosted: Mon Feb 12, 2007 6:17 pm 
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Joined: Wed Feb 07, 2007 8:13 am
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I changed the converter and it solved it all!!! I had the same problem with my buick 3.1.


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