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I have a '96 GM 3.1L (3100) and keep getting the PO401 error code: Insufficient EGR flow. However, in the documentation I have read that this can also mean EGR system malfunction. I had fabricated a metal plate to cover the openings on the EGR mount a while ago (admittedly, in the stupid notion that this improved engine operation). After realizing that the EGR probably helped improve FE, I removed the plate and reinstalled the EGR properly, but I still get the PO401 code. I'm wondering if having the ports covered for so long has gummed them up. I can't help but think that this is hurting my FE, and it's going to bug me until I fix it. I'll take the EGR back off next time I get a chance and clean out the intake port and see if that fixes the problem. It's possible that the tube coming from the exhaust manifold could be blocked too, though I think a good run with the other end open should solve that. I doubt that the EGR valve itself has gone bad, though there is really no easy way to test it with the equipment that I have.
Any suggestions/experience with EGR problems?
ALSO... Has anybody been able to successfully program an XGauge for SG that shows EGR operation?
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