Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

in desperate need of help. p0404????

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Old April 5th, 2009, 2:32 PM
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hey guys,
we got the 2003 impala working, it drives, but it will go very slow, its slugish, it seems as if it has no power. it has new plugs and wires. 3 new fuel filters. fuel pump was tested its putting anywhere from 50-60 psi for the pressure, so the fuel pump is good. the p0404 has something to do withthe egr/ exhasut system i belive. i've been reading al lthe threads, and people have replaced the egr but it did not help. i unplugged the egr, but still no change, unpluged the maf and still no change. guys plz if you have any clue or idea, please let me know. im going crazy.
Old April 5th, 2009, 9:29 PM
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Clogged cat
Old April 7th, 2009, 8:19 PM
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man, you nailed it on the spot.
wow thanks alot. just got it replaced.
$160 bucks i guess thats a good deal eh?
and also i took it to the dealer to do a diagnostic, and they told me that the horrible crazy noise is coming fro mthe lifters. what can i do about that?
Old April 8th, 2009, 5:22 AM
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I thought that might of been it.
Lifters, do a seafoam treatment and see if that helps
Old February 28th, 2015, 3:27 PM
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what is the answer to the problem
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