My 1996 Geo Tracker auto/ac 1.8L/16 valve has a check engine light and shows a p0400 EGR flow malfunction. I can clear the code but it comes back in about 2weeks. Runs great except it will sometimes try to die when idling and give off a bad odor when it does. Should I replace the EGR valve or does this sound like some other problem ?
My stepdaughter has a 97 and my mechanic called the chevy dealer after replacing the EGR valve and still getting the error code. There is problem with the tube from the valve to manifold carboning up. He used a piece of speedometer cable and an electric drill to clean the carbon out. Now it works fine.