Fuel Injector Monitor

F/I Spy allows you to diagnose several Fuel Injector problems. .
The following table describes the indication and the related problem.

Display	Problem/ Condition	Probable Cause
All LEDs remain Red.	The car does not start	The ECU is faulty

	The car starts and runs	F/I Spy's Sense wires are attached to the wrong wire at all the fuel injectors
		F/I Spy is faulty
All LEDs remain Green.	The car does not start	The ECU is faulty
	The car starts and runs	F/I Spy is not compatible with your vehicle's fuel injection system
One LED remains Red.	The car starts and runs OK	One F/I Spy's Sense wire is attached to the wrong wire at a fuel injector.
	The car runs rough	One fuel injector is not being commanded to open by the ECU.
		One fuel injector has a bad wire/electrical connection to the ECU.
One LED remains Green.	The car starts and runs OK	One F/I Spy sense wire is not attached properly.
	The car runs rough	One fuel injector to ECU wire is shorted to ground
		The ECU is faulty.
The LEDs flicker	Car runs OK	Normal for low RPM
The LEDs become orange.	Car runs OK	Normal for high RPM
The LEDs change from redish to mostly greenish.	Car runs OK	Normal under acceleration.
LEDs suddenly turn Red.	Car runs OK	Normal in some vehicles during deceleration.
	Car stumbles or hesitates	Fuel injectors are being held closed by the ECU. This usually indicates an engine sensor problem. Check the TPS, MAP sensor, and VSS. Intermittent sensor problems are difficult to diagnose but F/I Spy can help!
LEDs fail to illuminate	Car starts and runs OK	Probably a bad power connection for F/I Spy.
		Possibly a blown fuse for circuit supplying F/I Spy.
LEDs suddenly turn off but come back on.	Car stumbles or hesitates	Possibly a bad battery to ground connection
		Possibly a bad connection from the Alternator & + Battery connection.
		Possible engine fuse/ckt breaker.
		Possible electrical short
		Intermittent power connection to F/I Spy.