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2. Mixture could be too rich or too lean. Adjust fuel values for fastest idle speed, then if idle speed is still too
slow, adjust throttle stop or air bypass screw for faster idle speed.
Rough idle:
1. Bad ignition wire arcing to ground.
2. Mixture needs to be rich for best idle. Try adjusting fuel values until too rich, then lower the values until
engine is smooth.
3. Bad injector or bad cylinder. Unplug each injector to isolate.
4. Do engine compression check. Look for engine mechanical problem.
5. Bad connection at MAP sensor. Unplug and plug in the connector a few times.
6. MAP sensor vacuum line not connected or connected to the wrong area on the intake manifold or throttle
body.
Cuts Out at High Power:
1. Fuel pump not adequate.
2. Injector flow rate too low.
3. Check FUELCUT/MANPRESS parameter. Adjust and try again or set to NO LIMIT.
4. Fuel lines or filter plugged or too small.
5. Check for fuel flow out of regulator drain to return of fuel tank.
6. Engine is crossing an improper value.
7. Fuel pressure too high, injectors won’t open.
8. Fuel tank not vented. Remove filler cap check for suction.
9. Bad injector ground connection. Do Ohms check from chassis to pin 8 of white connector.
10. Install a fuel pressure gauge.
11. Reduce spark plug gap. Ignition voltage may not be high enough for stock plug gap specification.
12. If system is using a knock sensor then Knock sensor may be activating and reducing the ignition timing too
much. Try higher octane fuel or try lower Knock Sense value.
Not Running on all Cylinders:
1. Check each injector for clicking sound.
2. Bad ignition wire arcing to ground.
Runs but lacks power:
1. Check camshaft condition.
2. TPS vibrating and is activating the ACC PUMP function. Watch AP in Gauge2 mode. Should read zero
when throttle is steady. Set both ACC PUMP values to zero and see if problem goes away.
3. Check TPS hookup and ACC PUMP values for too high a value.
4. Mixture far too rich or lean. Increase or decrease all RPM FUEL values to correct or adjust knob.
5. Fuel tank not vented. Remove filler cap, check for suction.
6. (F only). Check timing with a timing light, magnets could be mounted incorrectly.
7. (F only). RPM IGN (ignition timing) values too low.
8. Check that closed loop is turned OFF.
9. If system is using a knock sensor then Knock sensor may be activating and reducing the ignition timing too
much. Try higher octane fuel or try lower Knock Sense value.
Programmer display is blank:
1. Check power and ground connections on black and red wires of main harness.
2. TPS connections are wrong. Try unplugging the TPS cable.
3. Programmer cable is damaged.
4. If +12V has been accidentally shorted to the EM-5 case, the circuit board may need repair, due to a broken
ground circuit.
SDS EFI in Window:
1. TPS connections are wrong. Try unplugging the TPS cable.
2. Power has been interrupted or EM-5 has reset.
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