1991 CADILLAC SEDAN DEVILLE EMISSIONS FAILURE PLEASE HELP!!!!!!!!!

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1991 CADILLAC SEDAN DEVILLE EMISSIONS FAILURE PLEASE HELP!!!!!!!!!

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Cadillac Forum >> General Technical Section >> US Emissions >> 1991 CADILLAC SEDAN DEVILLE EMISSIONS FAILURE PLEASE HELP!!!!!!!!!

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1991 CADILLAC SEDAN DEVILLE EMISSIONS FAILURE PLEASE HE... - 6/3/2008 12:56:15 PM

imhottt1971

Posts: 3
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Joined: 6/1/2008
From: chicago
Status: offline

HI MY NAME IS JOHN I HAVE A 1991 CADILLAC SEDAN DEVILLE I JUST PURCHASED IT IS NOT A TOURING MODEL HAS NO E CODES IN THE SYSTEM NO SERVICE ENGINE LIGHTS BUT FAILED SMOG TEST AT 323 IDLE SPEED HYDROCARBONS WHEN MAX ALLOWABLE IS 220 I READ SOME INFO SAID IT COUND BE A LOT OF THINGS I WAS WONDERING A LIL DIRECTION WOULD BE HELPFUL AS I JUST DO NOT WANT TO START REPLACING ITEMS UNTIL I FIND IT THANX JOHN HAS 135,000 MILES IDLES ROUGH A BIT

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RE: 1991 CADILLAC SEDAN DEVILLE EMISSIONS FAILURE PLEAS... - 6/4/2008 9:14:21 AM

carnut

Posts: 229
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Joined: 2/23/2008
Status: online

Verify first that engine is running up to normal temperature. If running too cool, below 195 to 210 degrees, you can get this reading. I've also gotten past this reading by using one gallon of denatured alcohol to a half tank of fuel. Alcohol provides more oxygen to lower this reading.

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2 1984 Eldos, 1991 Allante, 88 allante (sold)

(in reply to imhottt1971)

Post #: 2