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The 1991 Cadillac DeVille 4.9 engine incorporates a magnetic timing probe hole for use with special electronictiming equipment. Malfunction codes may be set during ignition timing adjustment procedure.Enter diagnostics and clear trouble codes if this occurs.#1 Place transmission in park .#2 With the ignition in the Off position attach a timing light to #1 spark plug cable .#3 With engine at normal operating temperature and air conditioning OFF,take off the air cleaner upper housing. The engine should be OFF at this point.#4 Jump pins A and B at the ( ALDL) connector.while not in diagnostic display.SET TIMING MODE message will apear on the climate control Driver Information center.#5 Start the engine and aim the timing light the timing mark loosen the distributor hold-down nut. While observing the timing mark, rotate distributor untill the line indicates the correct timing .This sets the base timing at 10 degrees BTDC at any speed under 800 RPM in the (PCM) The PCM controles the timing throughout the intire engine RPM range.This is the best imformation I can offer you good luck.
ABS (Antilock Brake System)
DDM (Door Driver Module)
DIM (Dash Integration Module)
IPC (Instrument Panel Cluster)
IPM (Instrument Panel Module)
IRC (Integrated Radio Module)
PCM (Powertrain Control Module)
RFA (Remote Function Actuation)
RIM (Rear Integration Module)
SDM (Sensing and Diagnostic Module) Includes airbag crash data. Under RF seat
VTD (Vehicle Theft Deterrent)
MSM (Memory Seat Module)
TTM (Tilt/Telescoping Module)
RSS (Road Sensing Suspension) ____________________________________________________________
How To Pull Codes
check for Diagnostic Trouble Codes stored in the computer, turn the
ignition on, then hold down the OFF and WARMER (for digital dash) or
OFF and passenger-WARMER buttons (for analog dash) or OFF and "Info ^"
buttons (if you have temperature dials) until all of the dash lights
come on. The digital display will then show any codes stored. Be
prepared to write them down. When it's done, you will probably see
"PCM?" At that point, press the OFF button 3 or 4 times until the dash
goes back to normal, or just turn off the ignition.
a diagnostic scan does not always pickup the problem in many cases. i have veiwed these problems in the past on a relatives caddy. it was usually the sensor that is at fault it may give the correct voltage to the computer thus no code or scan issues. best to take it to a dealer mechanic and have it analyzed and replaced. hope this helps. good luck...
pull codes from on board diagnostics turn key on not running press and hold hot button on temp and off at same time till dash lights up write down codes respond with all computer codes i will help you determine prodlem and try to fix