In a message dated 98-10-08 15:11:23 EDT, you write: << According to a file 747.wri that I have, there is at address xD1AD the value for EGR Enable Temp. Setting this value to 255 effectively turns off the EGR system, correct? Has this been discussed? Joe Boucher '70 RS/SS Camaro '81 TBI Suburban >> What address are you looking at???????- -Carl Summers