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Question
i have a 1990 cadillac fleetwood fwd with the 4.5 liter fuel injection. latly i have replaced the injectors with 4.9s. i was told by the shop i went to that my cat was bad and that it was missing. it was dianosied that it was bad fuel injectors. now that i have the 4.9s and i am currently changing the cat, am i in the clear or do i have to replace the ECM and BCM computer? also if i change the ECM and BCM will there be a chance that the computer go bad? also before i put in the injectors the transmission was hitting pretty hard and now its a little smoother.
thank you
Hi,
I am wondering how your shop determined the cat was bad. If there was a power issue or because of injectors sending too much fuel to it, or what their reasoning was?
As for a guaranty you BCM won't fail, there is no such guaranty. It's electronic as are the hundreds of sensors and wires going to it. Anything can fail at any given time for any given reason. Preemptive replacement of electronic components is not something you want to do unless you just want to waste money
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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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