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1990 Brougham service engine soon light - 1990 Cadillac Brougham

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Digital speedometer is not working on 1990 cadillac brougham


the digital and the analog work on the same cable check the cable from the transmission

Sep 23, 2012 | 1990 Cadillac Brougham

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the brake light switch is under the brake pedal and the turn signal is the one you move up and down

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90' Cadillac brougham digital dash going haywire then engine dies no restart.


big draw on battery ,,, get second check on alternator ,,,, then use ammmeter to see whats taking all the power from system

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1 Answer

1990 olds 88- the service engine soon light is always on


This car probably doesn't have a obd2 connector. More and likely it is the obd1 which most car part stores wont check. find someone that knows how to take a paperclip to access codes from the service engine soon light. If the light is staying on your "brainbox" sees that one of the sensors is not working to the cars standard. They make a obd1 connector that will plug in and will do the same thing.

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if you are not experienced mech. maybe you should take it to one

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It goes from the -side battery to the engine and is called the negitive battery cable.

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Do 1990 cadillac deville cars have a V6 engine?


No; the most common engine for that car is the 4.5L V8.  There were also 5.0L and 5.7L engines available for the Brougham.

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When was the last time you replaced the O2 sensor. Most people negelect replacing it every 50K or sooner if it is all short hops.

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