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What else could be causing the service light to stay on and my car to still idle rough?

Tiny
BAILEY#1
  • MEMBER
  • 1998 BUICK CENTURY
  • 186,000 MILES
My service light came on I had it scanned it said the Egr wasnt circulating right, It started cutting out really bad, changed the plugs and wires first, then changed the egr valve a week later it is still idling rough and the light came back on, and says the same thing
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Thursday, September 22nd, 2011 AT 3:13 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What is the EXACT trouble code you are getting?

Rough idling can be due to a few causes. If the idling speed is too low, it is usually due to a dirty thriottle body and IAC valve, retericting air flow.
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Thursday, September 22nd, 2011 AT 3:34 PM
Tiny
BAILEY#1
  • MEMBER
  • 2 POSTS
P0401 is the code it gives
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Thursday, September 22nd, 2011 AT 5:14 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Changing the EGR valve along usually don't work. You need to clean the EGR exhaust gas passages to rectify the problem.
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Thursday, September 22nd, 2011 AT 10:27 PM

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