[Shotimes] CHECK ENGINE On Deceleration

[George Fourchy]

On Wed, 3 Aug 2005 13:18:02 -0700 (PDT), Peter Maggiacomo wrote:

>Funny thing started today, with the CHECK ENGINE
>light coming on while decelerating from 75 in 5th 
>for an exit ramp. 

You might not have it, but EGR will cause this sort of a CEL, when the manifold
passages are starting to get plugged up.  The DPFE sensor doesn't see what it wants
to see regarding the quantity of flow of EGR gas doing what it should.

It could also be O2 sensors beginning to lag enough to trigger a light.  They get
slower and slower in their rich/lean switching signals to the computer as they get
old.  

George