Cadillac Repair/83 eldorado


I am rebuilding an 83 Eldo w/ 4.1 v8. Getting trouble codes: -1.8.8, 16, 20, 52, & 53 while pressing off & warmer while key is on. Have replaced: fuel pump, plugs & wires, rotor & cap. Checked for vacuum leaks. Checked all fuses. Car starts & idles fine but hesitates, nearly stalling, when accelerator is depressed. Sometimes will shutdown while idling. Had the instrument cluster rebuilt and is working fine. [Sent it to Advanced Auto Electronics in Midlothian, VA. They rebuilt it for $295 including freight both ways. Good people.] Do I need to replace the ECM? I am certainly NOT an expert mechanic but am rebuilding this car for my beloved wife who has had it since it was new. Any help will be greatly appreciated.
Thank you & all the best,


I have had many of them (always Biriatz).

Not being funny, but I don't see it mentioned. Did you change the fuel filter? You need to be careful reading the codes especially on the OBD I. As I have said many times before, one problem cascades into another. The 50s are the ECM, however does not mean you need and ECM. Do you have a 1983 Cadillac Eldo factory service manual?

Trying to diagnose without the manual will cost you needless money. I left 3 of them in my garage when I left Wisconsin. That sucks!

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Rob Painter


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?


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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