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2007 CTS has overheated metal smell


drdata313

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I have a 2007 CTS with the 3.6L engine and 26K miles. Recently, it started producing an odor of hot metal coming from underneath the car. The car runs fine, and there is no check engine indication. The smell is not that of overheated brakes, and there is no oil leak or any other indication. It is just the smell of hot metal, like something is overheated. Any thoughts as to how to diagnose this problem would be appreciated.

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For the heck of it, the next time you take a long drive at night, and smell the smell, with it still idling, look under the car in a dark area and see if you see the exhaust pipe glowing red anywhere on the exhaust especially before the cat.

In the daylight look to see if anything is melted onto your exhaust system, plastic bags, whatever

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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You know while I say that I think it could be the cat, at the same time, wouldn't that condition set a code?

Hmm, maybe its not a clog, but rich, if there is a fuel pressure regulator or injector problem dumping fuel into the exhaust

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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My car is considerably older but my cat got to the point of glowing red hot without ever setting a code. It was due to a bad coil allowing raw gas to dump into the exhaust, which ignited inside the cat. I had to replace the cat and the coil. The dead coil never set a misfire code either...and let me tell ya, there was NO denying that misfire!

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I could be wrong, but I don't think that OBD1 systems post a P0300, is that true?

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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I could be wrong, but I don't think that OBD1 systems post a P0300, is that true?

I just looked through my book of OBD1 codes, and you are right sir. There is no misfire code listed. I stand corrected. smile.gif

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However, while the OBD system does not report a misfire, with the correct equipment, a misfire can be detected. I am not sure if a Tech 2 can detect a miss

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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I would diagnose this by taking it to the Dealer for a warranty repair, loaner car, free soft drink, and window shopping of the new cars. Otherwise I agree likely to be overheating cat or something dripped onto one of the dual cats.

Bruce

2016 Cadillac ATS-V gray/black

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