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GOOD! MAKE
ANOTHER RUN TO
DOUBLE-CHECK
TUNING. THEN
PROCEED TO
MEDIUM LOAD
TRANSIENT TUING
DOES THE ENGINE
REV SMOOTHLY?
NO
RAISE LEFT 6 BOXES
OF THE
“Pulse Width – Rate of
Change of TPS” TABLE
0.3 mSec*
DOES THE ENGINE
REV SMOOTHLY?
YES
* Most of the time, fuel pulse
width needs to be added to these
tables if the engine doesn’t rev
smoothly. A lot of fuel needs to
be added before the engine
stumbles due to
too much
fuel.
As always, if the symptom gets
worse, try taking fuel out. Spark
advance can also have an effect.
REV ENGINE
SLOWLY IN
NEUTRAL
NO
YES
REV ENGINE QUICKLY
IN NEUTRAL
RAISE RIGHT 10
BOXES OF THE
“Pulse Width – Rate of
Change of TPS” TABLE
0.3 mSec*
Note: This flowchart is slightly simplified. See
accompanying text for details.
Figure 20 EFI Tuning Guide—Low Load Transient—After Base Map is Fully Tuned