Question about Cadillac DeVille
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Posted on Jan 02, 2017
SOURCE: 1989 Cadillac Sedan De Ville
It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.
The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.
Posted on Aug 16, 2010
Testimonial: "Thanks....I will look into it."
Castrol 20w-50 in summer and 10W-40 in winter, is best in my opinion.
It is high detergent, to remove sludge.
The thinner oil, like 5W-30 is only for better mileage, but cause piston and camshaft wear.
Posted on Oct 07, 2010
Testimonial: "Thanks for the answer!!!"
SOURCE: failed smog check due to
DTC Code E52 - this diagnostic test monitors the PCM/ECM long term memory for any loss of data. If the battery power or ground are disconnected the code will set (as you see). Code E52 indicates that the "long term" memory in the PCM/ECM has been reset. This will be the case whenever power is removed from the PCM/ECM (i.e., disconnecting battery cables, disconnecting PCM/ECM connector, etc.). This code should be "cleared" from memory after restoring the PCM/ECM's power supply.
To resolve this, the first thing you may want to do is something called a re-learn procedure as when you disconnect the battery, you end up wiping out the vehicles memory of how it is suppose to idle (which is why you are running rich and thus failing the smog check test). So what we need to do to resolve this is perform a re-learn.The second thing I suggest doing is you will need to do a throttle body cleaning procedure.
About the re-learn procedure: Quoting from a Cadillac bulletin dated Oct. 1990.
"IDLE LEARN IS USED ON 1990-91 DEVILLES, FLEETWOODS ELDO'S SEVILLES AND ALLANTES DURING COAST DOWN TO COMPENSATE FOR LOSS OF AIR FLOW DUE TO THROTTLE BODY DEPOSIT BUILD UP. IF THE BATTERY IS DISCONNECTED FOR A SERVICE PROCEDURE. OR FOR ANY OTHER REASON, THE LEARNED VALUE FOR THE IDLE THROTTLE ANGLE IS LOST. THE RESET PROCEDURE ALLOWS THE IDLE LEARN ROUTINE TO SEEK AND RETAIN THE PROPER THROTTLE ANGLE FOR EACH PARTICULAR THROTTLE BODY CONDITION. THIS DECREASES THE CHANCE OF STALLING DURING COAST DOWN. BEFORE PERFORMING THIS RESET, THE ENGINE MUST BE RUNNING A MINIMUM OF 18 MINUTES ON 1990 CARS AND 13 MINUTES ON 91 CARS. PLACE THE CARS TRANSMISSION IN DRIVE, BRAKES APPLIED. PLACE CLIMATE CONTROLS IN THE OFF POSTION AND ALLOW ENGINE TO REMAIN AT IDLE FOR AT LEAST ONE MINUTE. TURN ON THE CLIMATE CONTROL TO THE AUTO POSITION. LET IDLE ONE MINUTE. PLACE TRANS IN PARK AND TURN OFF IGNITION."
For more info on cleaning your throttle body, please check out: http://www.se-r.net/engine/clean_throttle_body.html
Hope this helps a bit :) Have a great weekend!
Posted on Nov 27, 2010
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