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Cadillac Repair/99 cadillac seville sts

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Expert: - 4/6/2009


Question
Mr.Painter I thank you first of all for looking at my question. I just bought 99 Seville sts, It runs great, quite, smooth, I love it. The problem is when I'm driving the car just shuts off. It will be running smoothly and just shut off. The dash cuts off and flickers for 5 to 10 seconds then turns right back on. I restart the car and drive away but don't understand it. check gas cap turned on as well as service engine soon. I had my local auto zone run the code and it came back P0440 code. I replaced the gas cap, but it shut off on me the next day. It will run fine for two days then shut off.I would appreciate any advice you have. Could relays have anything to do with the problem?

Answer
Hi,

To be perfectly honest with you, your problem does not deal with my expertise. Your complaint makes me believe it is a connector problem by what you describe with the dash. Movement may be making a difference here.

Just a suggestion. Sheck the connectors at the ECM and also under the dash at the firewall bulkhead connector.

Good Luck!

Rob

Cadillac Repair

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Rob Painter

Expertise

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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