Question about 2001 Isuzu Trooper

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2001 Isuzu Trooper PO405 code

I have a 2001 Isuzu Trooper that has an ongoing issue with PO405 codes coming up. The EGR valve has been replaced 3 times on this engine and generally goes away for a couple of years before replacement is needed. This time I went further by removing the throttle body assembly in front of the manifold and removing all of the carbon in the tube that connects intake channel to the channel at the back of the manifold where the EGR is connected. I ran bore brushes from both ends and vacuumed the channel out. I then sprayed carb cleaner from both ends to ensure all of the carbon was removed. All of that and I still get the EGR code PO405 every time I start the car. Any help would be greatly appreciated.

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The throttle body is coated with a sludge resistant material. If you cleaned it all out you are actually hurting your engines performance, because the throttle body resists sludge which in turn protects your throttle plate and bore. You may want to check your egr vacuum regulator, for the cause of your problem.

Posted on Jul 05, 2010

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