P0300 & P1406 Codes and Rough Idle - Fixed - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-22-2007, 11:33 PM   #1
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Default P0300 & P1406 Codes and Rough Idle - Fixed

All of a sudden, my car started running rough and the check engine light came on. I read the codes and got:

P0300 - multiple cylinder misfire detected
P1406 - manufacturer controlled auxillary emissions controls

I quickly got on the Bonneville Club site and did a search on the codes. It said the first thing to try was to clean the EGR valve with some carb cleaner so I gave it a try. Sure enough, that was it! I started it up and it was running fine. I erased the codes and I'm good to go. This site is AWESOME!!!

Thanks guys.
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Old 03-23-2007, 08:17 AM   #2
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Glad the site was able to help.
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