red-oak Posted August 21, 2016 Report Share Posted August 21, 2016 This is where I was a few short months back when I had to fix my fuel data center screen to pull the code that was putting on my service soon light so got back to it have a little time and the code is E48 EGR system fault. I sure can use advice as I am planning on getting on the problem second thing in the morning around 10 am Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 21, 2016 Report Share Posted August 21, 2016 Its always good to do a search, I found this, its covered pretty good Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
red-oak Posted August 21, 2016 Author Report Share Posted August 21, 2016 Thanks I have checked the tubes and they seam to be very clean I took the egr off and blew air through to the throttle body Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 21, 2016 Report Share Posted August 21, 2016 You need to clean the egr valve really good. Obviously, it is possible that you have a bad EGR. With the engine idling, reach up under it and press up and if it almost stalls or stumbles. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
OldCadTech Posted August 22, 2016 Report Share Posted August 22, 2016 BEST way to test an egr valve is apply vacuum to it using a mity-vac or similar tool while feeling for movement of the diaphragm THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!! Link to comment Share on other sites More sharing options...
red-oak Posted August 22, 2016 Author Report Share Posted August 22, 2016 I have a vacuum pump and gauge tools will try it this morning I also have that parts car with no codes and was E tested and passed but failed the safety inspection can I use the egr off of it ?? both are 4.9 1993's Link to comment Share on other sites More sharing options...
red-oak Posted August 22, 2016 Author Report Share Posted August 22, 2016 I popped the hood and looked at it to-day, using the service manual I found the vacuum line from the throttle body to the switch to the egr valve has a split in it so I replaced the line hopefully all is well but the idle seamed to of sped up on a test drive but seams to be ok now but code 98 was showing I cleared the codes as I needed to get the light off for an Etest Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 22, 2016 Report Share Posted August 22, 2016 Good find! Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
OldCadTech Posted August 22, 2016 Report Share Posted August 22, 2016 I think you have it fixed. YaY Yes the parts would be interchangeable ... THERE IS ALWAYS ENOUGH TIME TO DO THE JOB RIGHT - THERE IS NEVER ENOUGH TIME TO DO THE JOB AGAIN !!! Link to comment Share on other sites More sharing options...
red-oak Posted August 24, 2016 Author Report Share Posted August 24, 2016 the car passed the E test to day no code showing thanks Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 24, 2016 Report Share Posted August 24, 2016 Nice! Consider joining as a supporting member if we have been helpful to help support it. There are benefits Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
red-oak Posted August 25, 2016 Author Report Share Posted August 25, 2016 thanks and will look in to it for sure Link to comment Share on other sites More sharing options...
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