Eldorado V8-300 4.9L (1991)
Parts are currently available from GMSPO.
4.
Clean carbon deposits from the throttle blades and bores using a soft bristle brush (i.e., toothbrush and GM top engine cleaner, P/N 1052626, or
A/C-Delco carburetor tune-up conditioner, P/N X66-P, or equivalent.
IMPORTANT:
Do not use any solvent that contains methyl ethyl ketone.
5.
Check and adjust minimum air rate and Throttle Position Sensor (TPS) settings using procedures in the appropriate Service Information Manual.
6.
Perform TPS and idle learn Procedure:
NOTE:
Do not touch the accelerator pedal or steering wheel during the TPS and idle learn procedure. Make sure the outside air temperature reading is at least
50~F
^
Inspect throttle linkage for any signs of binding or improper cruise control cable adjustment. Ensure the accelerator pedal is free and clear.
^
Ensure the minimum air rpm is set at 500 rpm on vehicles with less than 5W miles or 525 rpm on vehicles with more than 500 miles.
^
Turn ignition on, enter diagnostics and wait for code display to begin, turn ignition off, and wait 20 seconds.
^
Turn ignition on, enter diagnostics and wait for code display to begin, turn ignition off, and wait 28 seconds.
^
Turn ignition on, enter diagnostics and wait for code display to begin, turn ignition off, and wait 20 seconds.
^
On 1990 vehicles, run the engine continuously for 18 minutes (under any operating conditions).
^
On 1991 and 1992 vehicles, run the engine continuously for 13 minutes (under any operating conditions).
^
Apply brake and shift transaxle into Drive.
^
Place the Electronic Climate Control in the OFF position and allow engine to idle for one minute.
^
Make sure the outside air temperature reading is at least 50~F
^
Place the Electronic Climate Control in the AUTO position, select HIGH blower, verify A/C clutch engagement by listening for A/C clutch "click"
under hood, and allow engine to idle for one minute.
^
Place transaxle in Park and turn ignition off.
IMPORTANT:
Because of the load differences on the engine with A/C on versus A/C off, idle learning must be completed under both conditions.
7.
If the above steps do not correct the stalling or hesitation problem, continue diagnosis using the appropriate Service Information Manual
procedures.
Warranty Information
