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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-01-2006, 01:42 PM   #11
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You said that the car has low miles driven by your father. A lot of times, older people drive a lot slower than the average motorist. This can lead to carbon buildup in the EGR system. In my experience with a variety of cars, if the EGR valve is carbon clogged, the internal passageways are also clogged to some degree. The best way I know to get them unclogged is to remove the intake manifold and clean it thoroughly.
As previously stated, this is just discussion until you know for sure what code(*) it is showing.
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