Quote:
Originally Posted by VW1300
Has anyone taken off and cleaned the EGR, especially on a 606? I did the EGR bypass but still am getting a P0400. The first time the code reappeared after the bypass, I changed my little air filter on the bypass and the code went away, and mileage increased again. Now 4 months on, this summer, mileage has been dropping again and finally the P0400 came back. The EGR appears to be opening and closing, I'm wondering if it's so sooted up that even air from the bypass can't get through very well. The flaps appear to be working properly.
It appears the EGR just unbolts, and cleaning should be straightforward I think. Just wondering if someone's been there/done that.
Thanks,
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Check all the vacuum hoses between the EGR valve, control solenoid and vacuum source for cracks. Also check the vacuum hose between the intake manifold and the MAP sensor on the driver's side. Both the lift sensor in the EGR valve and the MAP sensor on the manifold can trigger P0400 on the 97. The EGR control on the 97 is very different from both the 96 and 95 that came before it.
If you haven't done it already, you should remove the EGR valve and clean it thoroughly along with the entire intake manifold. The nipple on the manifold to the MAP sensor can also bee sooted up.