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Hello. I am stumped but for some reason my 1997 Cadillac Seville has started to produce a lot of smoke out of the exhaust when revving the engine or on starting him. It's been quite hot out so it's not just steam, the smoke alters in smell between acrid to sweet, and seems to reduce the longer you drive or the lower you idle. I am at a loss. A week ago I filled it to the brim with anti-freeze and filled up the oil to the max mark. It's not pitching any other symptoms other than the copious smoke (I don't think it's a head gasket). If anybody has any ideas I would love to hear them. I'm stumped and my dad is stumped and my car is still smoking like a freight train out the exhaust. Please help.

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Have you lost coolant?

How are the temps?

Do you smell fuel?, check for fuel at the vacuum port of the fuel pressure regulator (this would probably cause black smoke and a rich smell at the exhaust)

Does the engine have a misfire?

This is not a common problem.  

Do you have any driveability symptoms?  I would buy the Balkamp block tester from NAPA and test the coolant for evidence of a bad head gasket. 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >>

How to check for codes Caddyinfo How To Technical Archive >>

Cadillac History & Specifications Year by Year

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white smoke is often coolant or lean condition in the combustion; black smoke is often oil in the combustion or excessive fuel. 


2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

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