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P0401 will not go away!!

pontiac98

pontiac98

New member
Earlier this year after having the LIM gaskets replaced, all was good for a week or two. Then I get a SES light and have it checked, it's for the EGR. I forget the exact code but it may have been a P0404. So I let it go for a while, then a week ago I replaced the EGR valve entirely as cleaning it didn't help it any. I got the valve from 1a-auto and a genuine gasket for it from the dealership. I cleared the codes myself and about halfway on my way to work the SES light is back. I get home and check it and it's a P0401 (Insufficient EGR flow). I've checked all vacuum lines, the electrical connections on the valve look good. I also ran the car without the EGR valve on at all and it nearly stalled, so I plugged the intake side of it and the exhaust side is also functioning with very good flow it seems. I should add that this is a 1998 GTP. I have checked and replaced the PCV valve, but the original O-ring is still on it. I have also checked the vacuum line going to the MAP sensor and it seems to be fine. Also, after clearing the codes, I believe I have lost a couple of MPG's as well. I'm at a loss of what to do and I really don't want to take it to the dealership, again...
Thanks for any advice
 


Reason why your code won't go away is that you haven't fixed it. Flow is measured by the map sensor. If the sensor is going bad, you can get a flow error from it.
 
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