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02 impala codes 403, 405, 440

 
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SmilinJack
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2002 Chevrolet Impala
1995 Chevrolet Silverado


PostPosted: Thu Feb 04, 2010 12:33 pm    Post subject:  02 impala codes 403, 405, 440 Reply with quote

I am working on a friends car with these codes. 3.4 liter. Where do I start?! Could a plugged cat cause any of these codes? I know there was a recall on cats for these cars. Had a 303 code, changed plugs and wires and code cleared. Any help is appreciated. She has limited income so going off replacing things at will is a no go. Car idles rough but still gets it upon hard acceleration. Has 170,000 miles.
Thanks for any advise.
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IffyG
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PostPosted: Thu Feb 04, 2010 1:29 pm    Post subject:   Reply with quote

Off the top of my head, P0440 is most likely a problem with the gas cap (commonly not tightened or its just worn out). Can't help you with the others though.

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98ss
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PostPosted: Thu Feb 04, 2010 1:30 pm    Post subject:   Reply with quote

Sounds like the egr is stuck slightly open. Have you tried cleaning that out?
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buzzstpoint
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PostPosted: Thu Feb 04, 2010 1:38 pm    Post subject:   Reply with quote

P0303 Cylinder 3 Misfire Detected
P0403 Exhaust Gas Recirculation Circuit Malfunction
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
P0440 Evaporative Emission Control System Malfunction


At this point, since you replaced the plugs and wires. I would clear the codes and see what comes back.

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SmilinJack
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2002 Chevrolet Impala
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PostPosted: Fri Feb 05, 2010 8:49 am    Post subject:   Reply with quote

Thank you for the quick replies. Upon further investigation, the egr is frozen partially open, and the electrical plug on the valve itself is in rough shape. Since a new egr is outrageous in price, I am trying the local salvage yards. Also there seems to be oil in the anti-freeze. Maybe intake gasket?
I disconnected the positive cable for ten minutes then rechecked codes. Still the same four. Cylinder 3 still has misfire. I tested the coil and it was ok. The 303 code came back after about ten miles on new plugs and wires.
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98ss
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PostPosted: Fri Feb 05, 2010 1:50 pm    Post subject:   Reply with quote

Do you have access to a compression tester? If so, pull the front three plugs and do the compression test. If you have any questions about ihow to do a compression test, I would be happy to answer them.
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