Question about 1986 Cadillac Seville

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I have an 86 seville with a replacement 89 4.9 liter engine. i get "service engine soon" messages on dash & my engine occasionally stalls at idle, my mechanic has checked the computer but nothing reports. occurs 2-3 x per week. what can the problem be?

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On GM cars, it can be numerous issue, im surprised he not pulling any code, did you take it the dealer or one of the small garage mechanic. they are two different breed and may have the right equipment or updated computer. have you air mass/throttle sensor check common problems at idle the engine stall. you cant fix the unit, it has to be replace if it bad, check ebay for used if needing to replace the unit

Posted on Sep 26, 2009

Testimonial: "thk you very much. it was a small mechanic shop who'd installed the engine before i bought the car. ill run your reply past him & see if thats it."

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2 Answers

WHY DOESNT MY 2003 CADILLAC SEVILLE HAVE ANY POWER AND DOESNT WANT TO SHIFT EASILY


1. Verify the exhaust system is not plugged. Check for less than 1.5 PSI backpressure at 2,000 RPM in park, or open the exhaust before the converter.

2. Check the Manifold Absolute Pressure Sensor (MAP) for 4.8-5.0 volts Key On Engine Off (KOEO) and about 1 volts at idle.

3. Check actual engine vacuum at idle at 2000 RPM.

4. Unplug the Mass Air Flow (MAF) sensor, reset fuel trim to 0%, and road test. ALSO CHECK FOR FAULT CODES IN THE OBD SYSTEM.

Mar 28, 2015 | 2003 Cadillac Seville SLS

Tip

Cadillac service light 1989-01


Eldorado

2000-01

Turn the ignition to ON. Press the TRIP button on the driver information center (DIC) switch to view various menu choices and stop on OIL LIFE REMAINING. A message will display the percentage of oil life remaining. Press and hold the RESET button on the DIC switch for at least 2 seconds. A message will display the percentage of oil life remaining as 99 percent. The engine oil life monitor is now reset. Turn the ignition OFF.


DeVille,
Eldorado


1999

To reset the service Oil Life Indicator, display the
"OIL LIFE LEFT" message by pressing the "INFORMATION SKIP" (skip info) button. Press and hold the "RESET NO" (no info reset) button until "100% OIL LIFE" is displayed.


Deville,
Seville


2000-01

Turn the ignition to ON, Press the INFO button on the driver information center (DIC) to display ENGINE OIL LIFE. Press and hold the INFO RESET button on the DIC until the display reads 100% ENGINE OIL LIFE. The engine oil life index is now reset. Turn the ignition OFF.


Deville,
Seville,
Eldorado


1997-98

Display "ENGINE OIL LIFE" by pressing the "INFO" button. Press and hold the "INFO RESET" button until the message shows 100.


All Models
except
Fleetwood


1994-97

Press the "INFORMATION" button until "OIL LIFE LEFT" is displayed. Press the "RESET" button until "100" or "0.0 OIL LIFE LEFT" is displayed.


Fleetwood


1994-96

To reset "CHANGE OIL" light, turn the ignition switch to the run position without starting the engine. Fully depress and release the accelerator pedal 3 times within 5 seconds.


All Models,
Seville,
Eldorado


1993,
1994-95,
1994-95

The automatic transaxle message can be reset through the following procedure. If "CHANGE TRANSAXLE FLUID" appears on the Information Center, press and hold the "OFF" and "REAR DEFROST" buttons until "TRANS FLUID RESET" appears.


DeVille,
Fleetwood


1991-93

When "CHANGE OIL SOON" light is illuminated, press and hold the "RESET" and "RANGE" buttons on the Fuel Data Center for 5 to 60 seconds. When the buttons are released, the light will flash four times if it has been reset. If the light comes back on for more than 5 seconds, repeat the procedure.


Allante


1989-93

When "CHANGE OIL SOON" appears on the Driver Information Center, press the "RANGE" button until "OIL LIFE INDEX" shows on display. Then press and hold "AVG SPEED" and "RESET" (or "RANGE" on late models) buttons until display shows "100".


Seville,
Eldorado


1992-93

Press "INFORMATION" button on the Driver Information Center until "OIL LIFE INDEX" is displayed. Press "STORE/RECALL" until "OIL LIFE INDEX" resets to 100.


Seville,
Eldorado


1989-91

When "CHANGE OIL SOON" or "CHANGE ENGINE OIL SOON" appears on the Driver Information Center, press "ENG-DATA" button until the "OIL LIFE INDEX" appears. Then press the "ENG-DATA" button and the "RANGE" buttons at the same time until 100 displays (about 5 seconds).





















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I would guess there is a relation between the inop speedo and the service soon light being on. Push OFF and WARM on the climate control panel and hold down together for 5 sec to read codes.engine and transmission require speed input to set engine/trans parameters accordingly. The car car is safely performing in a back up mode until repairs are made

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