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When going down the road at operating temperatures, while giving just a small amount of gas the engine seems to stumble or missfire, and sometimes even will completely stall after you take your foot off the pedal. When I unplug the EGR valve it works fine, but when I plug it back in the troubles come back. Already tried replacing the EGR valve but it had no effect. Any suggestions? (Besides just leaving it unplugged)

94 Caddy Eldorado Touring, Northstar 4.6L

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If the EGR were not working, you would get a code.

You need to run down that code first

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

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P080 - TP/Idle relearn not complete. Tried relearning in numerous times and it doesnt clear the code. Whatever is causing the egr to not work right i think is preventing it

I don't know where you got this description for P080 but this is an OBD1 car (prior to 96),

P080 in OBD1 is

P080 (E080) ....................................................... Fuel System Rich

See this link http://myweb.accessu...90/dtcobd1.html

Check for a bad FUEL PRESSURE REGULATOR

See this thread, there is confusion about this code it seems the manual discusses it as a TPS idle relearn not complete, I attached a diagnostic tree

http://www.cadillacf...-p080-help.html

post-2998-0-26022900-1345308116_thumb.jp

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

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The EGR in this engine has a purpose. The lack of EGR causes a slightly LEAN condition. See this post by Al Cline (Cletus284), a NS Powertrain Engineer and you will see him referred to here as the Guru, genuflect when you hear his name :wipetears

http://www.impalassf...ad.php?t=267130

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

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