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Old 04-21-2003, 02:16 AM
Richard Wooldridge Richard Wooldridge is offline
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Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576
CO problem ...

Hi there,
I think you MAY have a bad EGR valve, causing the computer to try to compensate for the problem and raising the CO. If the EGR diapghram has a weak spring this condition can occur. Try replacing the EGR valve and see if the problem doesn't go away. What happens is the EGR valve opens when it shouldn't, and the computer richens the mix to try to compensate.
Not a costly item to try. Do you notice a slight surging whilst driving down the road? That's another indication that the EGR valve could be opening when it's not supposed to.

Good luck with it!
Richard Wooldridge
'82 300D/4.3L V6
'94 Taurus
'88 Astrovan
'77 Jag XJ6L
'77 280Z
'85 GMC S15 PU
'80 VW Cabriolet convertable
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