RE: New Ty problem??

["Jim Sloan" <leroy@sunflower.com>]

> Since I thought the problem was related to turbo overboost I wasn't
> looking at the obvious problem which was staring me right in the face. 
> The vacuum line to the EGR valve was disconnected from the EGR Valve
> nipple which would account for the "Check Engine" light.  But the thing I
> still don't understand is why it would come on under normal cruise
> conditions and not under the many WOT conditions that I subjected the
> truck to all the way home from San Francisco. Many times it had plenty of
> boost and never missed a beat, then when I wasn't doing anything but
> cruising home the light still wouldn't come on like it would during the
> trip up to S.F.  How can it come on one time under certain conditions and
> not during others under the same driving conditions but at a different
> time?  

My theory is because EGR is only enabled under part throttle conditions. 

Jim Sloan
leroy@sunflower.com
Syclone VIN# 1206
http://www.sunflower.com/~leroy