b. It may be that ignition timing is setup incorrectly. Then firing occurs at the wrong time
and failing to ignite the fuel mix. Check again the timing setup for the specific engine.
c. The plugs may be old or dead. Replace.
5. If the engine tends to stop cranking suddenly, check the following:
a. It may be that the timing is too fast. Reduce by 10 degrees. Add more teeth if a crank
gear are used.
b. If there is a magnetic crank or distributor sensor, check that positive and negatives are
not switched around.
c. If more than one coil is used, check for incorrect wiring or firing order.
10.1.4 Engine Backfires during Cranking
1. The engine backfires through the intake.
a. Faulty ignition timing or firing order. Check again the timing setup for the specific
engine.
b. If there is a magnetic crank or distributor sensor, check that positive and negatives are
not switched around.
c. If more than one coil is used, check for incorrect wiring or firing order.
d. Check if the RPM bar jumps erratic in the PC software. If it does, the gap of the
magnetic sensors may be too large or the signal is too weak.
2. The engine backfires through the exhaust.
a. Too lean fuel mixture. Increase by 10 on a time on the main jet.
b. Water temperature sensor or compensation map incorrect.
c. Some of the plugs may be old or dead. Replace.
10.1.5 Engine start but it stalls directly afterwards
1. Check the map sensor in the fuel map field is operating. The red bar should be on the right
hand of the Graph. If it is on the left side, it may need calibrating or it may be faulty or a wire
fault.
2. The fuel mixture may be too lean. Try to enrich using the main jet slider.
3. The temperature sensor may be faulty causing the cold engine to give a warm signal to the
ECU. Thus leaning the mixture out.
4. Incorrect Fuel Cutoff settings. A symptom will be that the milliseconds bar on the real time
block will jump to 0.
10.1.6 Engine start but is very rich
1. Check the map sensor in the fuel map field is operating. The red bar should move to the left
of the screen. If it is standing on the right it is faulty or wiring fault.
2. The main jet or idle jet slider is too high. Try lowering them to the values it came with. Main
138 and Idle 70.
3. Check if the water temp sensor is working. If not it will keep on enriching the mix as if for a
cold engine.
4. Some of the plugs may be dead, and then the engine looses manifold vacuum resulting in
enriching the other pistons.
5. Fuel maps set to too high values. Lower the values.
6. Fuel pressure regulator regulates too high. Measure the pressure. It should be between 2.5
and 3.5 bar.
10.1.7 RPM signal very erratic.
1. Incorrect magnetic trigger polarity.
2. Interference on pickup.
10.1.8 Engine start but do not rev up
1. Check the map sensor in the fuel map field is operating and calibrated. The red bar should
move to the right if the throttle is pressed.
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