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Daryl, Shop Owner, Master Mechanic
Category: Buick
Satisfied Customers: 12547
Experience:  28 years experience, Master Mechanic
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Buick: 1997 buick century 3.1 code p1406 and car surges at

Customer Question

1997 buick century 3.1 code p1406 and car surges at idle in park not real bad but does surge. Replaced egr light comes back on car still surges. any ideas . no other codes.
Submitted: 4 years ago.
Category: Buick
Expert:  Daryl replied 4 years ago.

This is very common on this vehicle, there is a small passage way that goes from the egr valve to inside the intake that passage way gets plugged and needs to be cleaned by putting a wire through it.

Customer: replied 4 years ago.
will help the surge also??
Expert:  Daryl replied 4 years ago.
It may or may not but its the place to start, if it does not help you might try cleaning the Mass air flow sensor to see if that helps.
Customer: replied 4 years ago.
if maf is disconnected it does stop surging, but cleaning didnt help maybe replace?? reads 60 on scanner at idle
Expert:  Daryl replied 4 years ago.
Yes it may need replacing but I would deal with the code first just to be sure.
Daryl and 3 other Buick Specialists are ready to help you
Customer: replied 4 years ago.
figured out what was wrong and u wont believe it
Expert:  Daryl replied 4 years ago.

You got my attention?

Customer: replied 4 years ago.
bought car from customer that had intake done a year ago from some where else, finally noticed egr was put on BACKWARDS!!
Expert:  Daryl replied 4 years ago.
Oh thats awsome, I have heard of that but never seen it done.
Customer: replied 4 years ago.
Expert:  Daryl replied 4 years ago.


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