Ford
> Engine > Spark Control > Spark Advance
Main Spark Tables
Note: Excessive spark advance will cause knock (detonation,
pinging) and lead to severe engine damage. Do NOT rely on knock
sensors as the only source of detecting knock during tuning.
- Spark Borderline Knock vs. RPM vs. Load: This is the
main spark table calibrated to prevent the engine from
knocking(detonating,pinging) at 14.7:1(1.0 Lambda). It is typically
calibrated at normal operating temperatures and 75F/25C IAT's.
- Spark Borderline Knock(Alcohol) vs. RPM vs. Load: This
is the main spark table calibrated to prevent the engine from
knocking(detonating,pinging) at 14.7:1(1.0 Lambda). It is typically
calibrated at normal operating temperatures and 75F/25/C IAT's.
Alcohol applications.
- Spark MBT vs. RPM vs. Load: This is the theoretical
spark that produces maximum torque for the engine, it is used for
torque calculations and is also a maximum limit for spark
advance.
- Spark Decel vs. RPM vs. ECT: This table determines the
spark that is used for Deceleration conditions in relation to RPM
and ECT.
Spark Idle
- Spark Idle In Gear vs. ECT: Idle spark value when in
Gear.
- Spark Idle P/N vs. ECT: Idle spark value when in
Park/Neutral.
- Spark Idle Gain vs. Cold Start Spark Retard: Multiplier
for spark during cold start retard.
- Spark Idle Control Minimum: This is the minimum allowed
spark that the idle control routines will command when trying to
reduce engine RPM.
Cold Start
- Spark Maximum Cold Start vs. ECT vs. ERT: This table
provides a maximum spark limit for catalytic converter warmup
during cold starts in relation to ECT and Engine Run
Time(ERT).
- Spark Maximum Cold Start Adder vs. RPM vs. Load: This
table adds to the maximum spark limit for catalytic converter
warmup during cold starts in relation to RPM and Load.
- Spark Maximum Cold Start Adder vs. RPM vs. CatTemp: This
table adds to the maximum spark limit for catalytic converter
warmup during cold starts in relation to TPS and CatTemp.
- Spark Maximum Cold Start(Alcohol) vs. ECT vs. ERT: This
table provides a maximum spark limit for catalytic converter warmup
during cold starts in relation to ECT and Engine Run Time(ERT). For
Alcohol applications.
- Spark Maximum Cold Start Adder(Alcohol) vs. RPM vs.
Load: This table adds to the maximum spark limit for catalytic
converter warmup during cold starts in relation to RPM and Load.
For Alcohol applications.
- Spark Maximum Cold Start Adder(Alcohol) vs. TPS vs.
CatTemp: This table adds to the maximum spark limit for
catalytic converter warmup during cold starts in relation to TPS
and CatTemp. For Alcohol applications.
Spark Correction The VCM incorporates a number of
corrections to the spark advance depending on current engine
operating conditions.
- Spark Lambda Correction vs. RPM vs. Lambda: This is the
main spark correction for Lambda(AFR) in relation to RPM and
commanded Lambda.
- Spark IAT Correction vs. IAT: This is the main spark
correction for inlet air temperature(IAT).
- Spark IAT Correction Mult vs. RPM vs. Load: This table
multiplies the Spark IAT Correction value in relation to RPM and
Load to determine the final IAT Correction spark.
- Spark ECT Correction vs. ECT: This is the main spark
correction for engine coolant temperature(ECT).
- Spark ECT Correction Mult vs. RPM vs. Load: This table
sets a maximum allowed spark to limit combustion pressure in
relation to RPM and Load.
- Spark IMRC Correction vs. RPM vs. Load: This is the main
spark correction for when the IMRC is open in relation to RPM and
Load.
- Spark IMRC MBT Correction vs. RPM vs. Load: This is the
MBT spark correction for when the IMRC is open in relation to RPM
and Load.
Variable Cam Spark
- Spark VCT Correction(IMRC Open) vs. RPM vs. Load: This
is the main spark correction for when VCT is active(in closed loop
mode) in relation to RPM and Load. The values are in degrees per
camshaft degree.
- Spark VCT MBT Correction(IMRC Open) vs. RPM vs. Load:
This is the MBT spark correction for when VCT is active(in closed
loop mode) in relation to RPM and Load. The values are in degrees
per camshaft degree.
- Spark VCT Correction(IMRC Closed) vs. RPM vs. Load: This
is the main spark correction for when VCT is active(in closed loop
mode) in relation to RPM and Load. The values are in degrees per
camshaft degree.
- Spark VCT MBT Correction(IMRC Closed) vs. RPM vs. Load:
This is the MBT spark correction for when VCT is active(in closed
loop mode) in relation to RPM and Load. The values are in degrees
per camshaft degree.
- Spark VCT Correction vs. RPM vs. Load: This is the main
spark correction for when VCT is active(in closed loop mode) in
relation to RPM and Load. The values are in degrees per camshaft
degree.
- Spark VCT MBT Correction vs. RPM vs. Load: This is the
MBT spark correction for when VCT is active(in closed loop mode) in
relation to RPM and Load. The values are in degrees per camshaft
degree.
Miscellaneous
- Spark Combustion Noise Retard vs. RPM vs. Load: This
table provides spark retard to control combustion noise in relation
to RPM and Load.
- Spark Emissions Retard vs. RPM vs. Load: This table
provides spark retard for emissions purposes in relation to RPM and
Load.
- Spark Load Increase Correction vs. RPM vs. Load:
- Spark Combustion Pressure Limit vs. RPM vs. Load: This
table sets a maximum allowed spark to limit combustion pressure in
relation to RPM and Load.
- Spark EGR Correction vs. Load: This table is the spark
adder for EGR in relation to Load. The values are spark degrees per
percent of EGR.
- Spark Octane Plug Adder vs. RPM vs. Load: This table is
used to modify the spark based on whether the Octane Plug function
has been enabled by the dealer.
- Spark Low Load Maximum vs. Time: This table provides a
maximum spark limit when uner low load conditions in relation to
the time that the engine has been operating at low load.
- Spark Firing Order vs. Cylinder #: This defines the
firing order. We recommend not changing this.
- Spark Global Adder: This value adds to the final spark
advance value.
- Spark Global Multiplier: This value multiplies the final
spark advance value.
Spark Tip-In
- Spark Tip-In Torque Control RPM Max: Above this RPM,
Spark Tip-In Torque Control will be disabled.
- Spark Tip-In Torque Control RPM Min: Below this RPM,
Spark Tip-In Torque Control will be disabled.