Hello I will help you with your question,
If you can list the model of your vehicle I can tell you the prom info
Thanks
With the "C" vin you should have a range from 16181859 to 16165839
Do you have a scan ID or the part number of the PROM that is currently installed?
If there was a fire that involved the wiring harness I would be looking there first but if you will get me the current PROM number I will check if it needs to be replaced. There are over fifty numbers that it could be so I will need the current number to be sure.
I understand that the wiring has had extensive work so that is why I would start with its integrity and the connectors. There is only one sensor that can be adjusted and that would not cause an idle and die problem, that is more likely a vacuum leak or EGR issue.
The ECM is the correct one but the PROM is not listed for your year and I am not finding a 16122494 listed in any of the preceding or following years. The number sequence does indicate it is for a 3.8 but there are lots of 225s or 234s so maybe the number is incorrect?
I have exhausted my resources and if the number is correct I will OPT out and let other experts help you
Let me know about the number
This is the PROM code and is another way of identifying the prom. The part number (16122494) is the best way to identify the correct part.
There is a 2517 ANBF in a 1988 3.8 VIN "C" which was the same XXXXXXX ECM part number that was changed for setting false codes 44 and 48 but that still would not cause your issues.
I think you will find the cause of your problems by chasing vacuum leaks with spray carb cleaner, running the vacuum lines for breaks or blocking the EGR valve to see if the issue gets better
I believe that you would have different issues if the prom were at the root of your problem
I am not so concerned that the prom number does not match the printed information, it seems that the ECM you got was an early model year 1989 so it had the previous years ECM and prom in it. GM was so busy trying to keep up with the engineering changes and issuing new prom to do so it had pages and pages of numbers that all worked in the same ECMs but had a single line of code difference to correct different problems that crept up as the vehicles went into service. Today we reflash the prom in the car so it is marginally easier to update the software and keep track of what update is the latest.
I think that it may be time to get a scantool that you can watch data and see what the computer is seeing. Pull codes if any by shorting the two top right pins in the DLC under the steering wheel and turning the key on (if you are not familiar with this let me know) Tap the MAF while the engine is at idle and se if it stumbles these early MAFs were known to fail.
These are a few things I would do if this was in my service bay and you can start there and let me know how you make out with those
ASE Master Technician
ASE Master Tech 10+ yrs, AAS Automotive Technology, Factory trained Asian specialist
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Glad to help it did sound like a vacuum leak more than a Prom issue. Thanks for letting me know the outcome.