1994 Cadillac El Dorado proms

Hi peterrmick, Thank you for the donation. Here are the explanation of the fault tree. Hope it is the one you are refering to.

"Where can I locate proms for the car "94 ETC"? " I am sorry I do not understand what you are refering to from the above, can you please elaborate?

Hello,

With respect to the 4.9L engine and Northstar (4.6L) engine, the P080 code has different meanings.

For the Northstar, the Factory Manual states the P080 code means there is a "TP SENSOR IDLE LEARN NOT COMPLETE" problem.

The P080 code in the 4.9L engine refers to 'FUEL SYSTEM RICH'

INFORMATION RELATED TO P080 CODE AND 4.9L ENGINE:

In the 4.9L engine, the purpose of the P080 code is to detect a rich condition in the fuel injection system, or continuous evaporative (EVAP) control canister purge.

1. A rich fuel injection system can be caused by:
A. Leaking injector
B. Faulty fuel pressure regulator
C. Restricted fuel return line

2. Continuous evaporative emission (EVA) control canister purge can be caused by:
A. A leaking purge valve
B. Purge solenoid, circuit or PCM



.

The PROMS refer to the plug-in memories for the ECU I substituted. I couldn't get new ones so I used the original memories (they could have transferred the problem) I rechecked the procedure to clear the "current P080" and it is still there and so is the problem. I don't know the difference between the TP sensor and the throttle position sensor (which was replaced- a potentiometer) I'm not a mechanic but the problem "feels" like a mechanical one to me. It seems to start when the throttle is closed, and when it starts the car is immediately not drive-able. no power and not many RPMs in neutral. The car has to sit for several hours before the problem clears. Once it clears the car runs perfectly for a few hours to a few weeks and when the problem reoccurs I can't relate it to time, driving conditions or temperature. When the car is not running correctly the MAP sensor reads about 14mmHg (low pressure) steadily when read off of the ECU data bus. Could the throttle body plate be stuck in the closed position?, is there a procedure for maintaining it or checking it mechanically?, The Map sensor has been replaced and behaves like the first one and also neither gave a fault code. I hope this helps and thanks for the support. Pete M.

Hi Pete,

TP and throttle position sensor are the same. Just noticed it was repeated with both names. Sorry for confusing you.

Did you clear the codes before trying the relearn procedure? Is your engine 4.6 or 4.9 as pointed out by my fellow technician, obxautomedic?

Was the TP replaced a new or used unit?

[quote:d43ec9dd84="KHLow2008"]Hi Pete,

TP and throttle position sensor are the same. Just noticed it was repeated with both names. Sorry for confusing you.

Did you clear the codes before trying the relearn procedure? Is your engine 4.6 or 4.9 as pointed out by my fellow technician, obxautomedic?

Was the TP replaced a new or used unit?[/quote:d43ec9dd84]

The TP was replaced with a new one and it behaved the same as the one that was replaced, responsive when the engine was running normally but steady at high vacuum when the engine was running poorly (as seen on a scanner). The engine is a 4.6L. I didn't erase any codes and I don't know how to do it. The only one showing is P080.

Any comment on the throttle body butterfly "sticking" causing the low manufold pressure? Pete

Hi Pete, If the throttle butterfly is sticking, you would feel it on the accelerator. Here are the procedures for clearing the codes. Without clearing the codes, the PCM might not react correctly.

The service mode chart is too small to be printed legibly and if you require it, let me know what emial to send to.

I hope the diagram helps (e-mail is [email protected] *note the 2 r's), I assume that is FIG2 in your response?. Is the Michaels1 repair manual a worth while investment? (assuming I get back on the road). Thank you Pete

I will be sending the files to you. Let me know once you get it.

I would say Mitchel1 is a worthwhile subscription. You have almost all the technical information of the vehicle.

If I am not mistaken, the fees is $30 for a single model for 1 year. If you wish to have further information, I can get one of the administrators to explain it to you in details.