Haltech E6GMX - Manual (Page 51)

E6GMX Manual
51
timing light. Crank the engine and check for spark (easily checked with a timing light). Now
crank the engine and look for the timing mark with the timing light (ensure you have the
timing light connected to the correct cylinder). If the timing is wrong change the trigger angle
(in the Ignition or Trigger set-up page) until the timing reads correctly. If you cannot see the
timing mark you may need to estimate the trigger angle based on the relative positions of the
engine and the crank position or cam position sensors and then try the test again. The trigger
angle should be approx 15 deg more than the maximum ignition advance you wish to run.
NOTE:
DO not crank the engine for prolonged periods. To conserve the battery
remove the spark plugs to take some of the load off the starter motor during
cranking.
WARNING:
WHEN CONDUCTING A TIMING CHECK IT IS ADVISABLE THAT
TWO PEOPLE BE PRESENT, ONE TO CHECK THE TIMING AND
THE OTHER TO CRANK THE ENGINE. BE SURE TO
COMMUNICATE PROPERLY ESPECIALLY WHEN DOING THE
TIMING CHECK NEAR MOVING BELTS.
Once the trigger angle is set correctly lock timing should be disabled and fuel injectors
enabled so an attempt may be made to start the engine.
5.4 Determining Ignition Timing
The default ignition timing loaded into the ECU at the factory is 15°BTDC across load and
engine speed. This map is often sufficient to get the engine started. If this ignition map is not
suitable a basic timing curve should be constructed.
5.5 Determining Engine Fuel Needs
The ECU should now have sufficient set-up information to start and control the engine. The
basic fuel map loaded into the ECU at the factory may allow the engine to start and run. The
following paragraphs should offer enough information to get the engine running and idle
smoothly.
WARNING:
WHEN TUNING AN ENGINE, ESPECIALLY UNDER LOAD, IT IS
ADVISABLE TO HAVE AN INDICATION OF THE AIR-FUEL RATIO
AT WHICH THE ENGINE IS RUNNING. IT IS RECOMMENDED
THAT A WIDE-BAND OXYGEN SENSOR BE USED FOR THIS SINCE
IT DISPLAYS THE AIR-FUEL RATIO QUICKLY.
It is helpful, when first starting the engine, to have a “Trim Control” connected to the ECU
loom to allow quick changes to fuelling refer to 4.2.5 The In/Out Set-up Page, p35.
Before starting the engine, go to the fuel map Range 1 (0 rpm), it is this map that the ECU
will use to calculate fuel requirements during cranking. The behaviour of fuel calculation
around cranking and idle differs depending on the type of load sensing used.