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Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - ENGINE TIMING CHECK
36
4. Highlight the vehicle model year, then press ENTER .
For 1993 and newer vehicles: The message “Follow
instructions in vehicle service manual to perform timing check”
displays. Press SYSTEM MENU
to return to the Ford Menu.
Refer to the vehicle’s service
manual for procedures.
For 1992 and older vehicles: The
message “Warm up engine to
operating temperature” displays.
5. Start and warm the engine to normal
operating temperature. Press ENTER
to continue.
6. When prompted, turn off all vehicle accessories, turn ignition key OFF
and wait for the on screen prompt. If you wish to exit the Timing Check
procedure at this time, press SYSTEM MENU
.
7. When instructed, start the engine and
press ENTER
.
A "One moment please preparation
for test is in progress” message
shows temporarily, followed by the
message "Perform Timing Check
within two minutes."
8. Perform the Timing Check as follows:
The vehicle's computer is programmed to advance ignition
timing 20° (±3°) above the vehicle's "base timing" value, and to
freeze this setting for two minutes from the time the "Perform
Timing Check within 2 minutes" message displays.
Within this two-minute period, follow instructions in the vehicle's
service repair manual to check the ignition timing with a timing
light and ensure that it is 20° above the specified base timing
value (±3°).
Example: If base timing specification is 10° BTDC, the acceptable
timing light reading should be in the range of 27° to 33° BTDC.
Base-timing specifications can be found on the Vehicle
Emission Control Information (VECI) decal. If the VECI decal
is missing or damaged, refer to your vehicle's service repair
manual for specifications.
9. If timing light readings are within the acceptable range:
Base timing and the vehicle computer's ability to advance timing
are working properly.
Proceed to the KOER Self-Test.
10. If timing light readings are not within the acceptable range:
Base timing may be out of adjustment, or the computer may
have problems with the timing advance circuit.
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