EGR circuit malfunction. Your exhaust gas recirculation valve is not operating properly. The valve opens under certain conditions (mostly off idle) to recirculate exhaust gases back through the intake and through the cylinders, to lower combustion temperatures for cleaner emissions.
Often the valve itself, or the passages under it, get clogged with carbon build-up and cease operation. Take the valve off and clean it with a wire brush and maybe a small blade. If you push up on the valve's diaphragm, you should see the pintle on the bottom of the valve raise with the diaphragm. If it doesn't work right, replace the valve (a salvage unit should work). Also take the blade and clean out the passages of carbon. Clean them as best you can so the passages are not clogged up. Then put the valve back on with a new gasket, if needed.
Some people just do away with the egr valve when it stops operating, by taking off the vacuum line to it and plugging the vacuum line off. Then the valve cannot open. Sometimes the valve gets stuck open, resulting in the engine idling poorly.
SOURCE: error codes
ERROR CODE
MALFUNCTION DESCRIPTION
12
ERROR CODE DIAGNOSTIC SYSTEM FUNCTIONING CORRECTLY
13
OXYGEN SENSOR CIRCUIT OPEN
14
COOLANT TEMPERATURE SENSOR CIRCUIT (HIGH TEMP)
15
COOLANT TEMPERATURE SENSOR CIRCUIT (LOW TEMP)
21
THROTTLE POSITION SENSOR (TPS) CIRCUIT (HIGH)
22
THROTTLE POSITION SENSOR (TPS) CIRCUIT (LOW)
23
MANIFOLD AIR TEMP (MAT) CIRCUIT (LOW TEMP)
24
VEHICLE SPEED SENSOR (VSS) CIRCUIT FAILED
25
MANIFOLD AIR TEMP (MAT) CIRCUIT (HIGH TEMP)
31
WASTEGATE SOLENOID ELECTRICAL SIGNAL FAILED
32
EXHAUST GAS RECIRCULATION (EGR) CIRCUIT
33
MASS AIR FLOW (MAF) CIRCUIT (HIGH)
34
MASS AIR FLOW (MAF) CIRCUIT (LOW / NO SIGNAL)
35
CODE NOT USED ON TURBO CARS
41
CAM SENSOR CIRCUIT FAILURE
42
C3I ELECTRONIC SPARK TIMING (EST) FAILURE
43
ELECTRONIC SPARK CONTROL (ESC) FAILURE
44
OXYGEN SENSOR CIRCUIT (LEAN EXHAUST)
45
OXYGEN SENSOR CIRCUIT ( RICH EXHAUST)
51
PROM ERROR
52
CALPAK ERROR
53
WATER INJECTION
54
CODE NOT USED ON TURBO CARS
55
ECM ERROR
Return to Chart
CODE 12
SOURCE: Oldsmobile cutlass 1993 Wont engage when engine cold.
Check your transmission fluid level You will need to top it up if low. Low fluids mean that not only will the transmission be slow to respond but when it engages gear it does so with a bit of thump. If the fluid stays low this thumping of the gear changes will eventually shear off the input shaft. Also check the linkage located from beneath the gear shift to the transmission casing and adjust it if necessary. My guess is that topping up the transmission fluid to its proper levels will solve the problem without need for any adjustment
SOURCE: i need to reset the timing on my 93 oldsmobile
You must have an ignition distributor to be able to reset or change the engine timing. If you do have a coil pack then the engine timing is completely controlled by the computer and there is no timing adjustment.
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