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Cadillac Repair/96 Cadillac deville

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Question
Just newly bought 96 Cadillac deville it ran good then it wouldn't start up once cut off check engine like on six codes came up the map sensor,  egc,  air  compress,  etc.   While idle it revs on its own,. While   driving  it squeaks  and  a  "gassy"  smell  comes  off  the car.  The  battery   and   alternator    are    good.So any idea wat it might be?

Answer
Hello,

I would recommend taking the vehicle to a reputable repair garage (not a dealer) and have them connect their diagnostic scanner on the vehicle. The codes can cascade, where one sensor will set off another and the only way to diagnose is with the proper equipment.
The check engine light is for emissions and means the computer system is not in closed loop, there by affecting mileage, performance. This is why the engine did not start. This is your gassy smell and if you run it long enough like that, the catalytic computer will plug and you will have 0 power. Get diagnosed as soon as possible.

As for your squeak, I am not at the vehicle, so I would not know where to look, however you might consider the suspension, either shocks or struts.

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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