Improper flow EGR valve - Impala Tech
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post #1 of 2 (permalink) Old 10-26-2010, 10:13 PM Thread Starter
Join Date: Oct 2010
Location: Maryland
Posts: 1
Improper flow EGR valve

I have 2003 Chevy impala Base 3.4 engine that the engine light stays on. The car runs great. I have gone to Auto Zone three times to have them check the faults to see what the problem is. Each time it has come back improper flow EGR valve. I have replace the EGR valve and removed and clean the pipe down to the exhaust manifold twice. I started the car last time and removed the pipe that goes down to the manifold to see if it was exhausting without a clog and it seem to be clear. I have had Auto Zone reset the CPU and have remove the battery post and reinstall to reset the fault. It seems to work until the engine becomes warm, then the engine light reappears. What else can I do? The light has been on for two years, the car runs fine. The only reason why I need to fix this is because the vehicle will not pass Maryland emissions.
fxhamby is offline  
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post #2 of 2 (permalink) Old 10-27-2010, 12:44 AM
Join Date: Jan 2006
Posts: 12,458
Welcome to the Team Frank!

Check the thermostat housing vacuum switch to see if it is activating the line to the valve once it reaches operating temp. This exhausts my entire repotorie of knowledge about EFI cars as I don't own one. (all my cars have carburetors on them and I don't use any computer controlled devices. The only tuning tool I use is a screw driver). Most of the members on this board own 1961-'70 full size rear wheel drive cars.

Big Dave
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