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Cadillac Repair/1990 Seville Stalls 4.5

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Question
My Caddy stalls from time to time, but it starts back up almost immediately. Cadillac Service Center did a diagnostic and determined it needed the #8 injector replaced and ECM. Should I trust what they are telling me and is their a code you need to know when replacing the ECM.

Answer
Hello

Intermittent problems are the worst to diagnose and repair.
As for the diagnoses as to an injector and ecm- not so fast!
This car has the OBD I computer system which is not known for its accuracy. The new standard which was introduced about 1994 known as OBD II is still used today.
The OBD II gives pin point accuracy where as OBD I just gives you a rough idea as to the problem. Other sensors on the OBD I can set off false diagnostics. My concern is you ill replace these parts at high cost only to find you fixed nothing.you are best off letting the problem become much more pronounced in which case you can properly diagnose the problem. Otherwise you are just guessing and hoping for good results.

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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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