Haltech F10 - Manual (Page 91)

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A.8 Cold Running Proble ms
If the engine idles poorly when cold then the coolant map may need adjusting. If the engine is
hunting slightly when cold, then the coolant correction map is lean and fuel must be increased
in this map. Ignition advance also has an effect on the idle speed.
If the engine is difficult to drive when cold, particularly with gear changes, try increasing the
coolant correction factor for the throttle pump.
If an engine idles when warm, but fails to idle when cold without the throttle being opened
slightly may require idle speed control. The F10 can control an Idle Air Control motor that
will solve this problem.
A.9 Fuel Consumption
Poor fuel consumption is a result of an excessively rich mixture.
- If the fuel consumption in traffic is poor but the highway consumption is
good, then the areas of the map used for accelerating will need to be
reduced.
- The throttle pump will waste fuel if its values are too high.
- Try using the engine deceleration fuel cut-off feature.
- If the city consumption is fair but highway cruising uses too much fuel
then lean out the light load bars on the 2000 rpm to 3000 rpm maps (This is
where most cruising takes place).
- The cold start map may supply too much fuel on warm-up if this map is
rich at low temperatures. Try tuning for cold start properly by leaving the
engine stand over-night and perform the cold start tuning in the morning at
a variety of temperatures.