2 replies to this topic

[timmo]

Got the '95 Sprite SPi project started, not had it / heard it running before. All ok, but when I turn ignition off there's a clicking/buzzing noise for a few seconds coming from around the injection unit area sounds like a relay buzzing but can't see any relays behind the air filter. Anyone know what is making the noise?, is it supposed to?, not owned an SPi before so don't no what to expect   Any info much appreciated 

[humph]

This is, in theory, correct. The clicking are the various relays switching, and the buzzing is the stepper motor (mounted on the throttle body) indexing to it's correct position ready for start up.

 

See this thread in the injection specific sub forum for info on it's operation

 

https://www.theminif...otor-operation/

 

"When you turn off the engine, you should hear an audiable clicking, this is the ECU driving the stepper fully closed. It drives it for 180 steps and a few more to make sure its closed, in doing this it knows where it is, zero steps, and can then count the steps open. After it has driven the steppper full closed and before the ECU switches off, It then opens the stepper to a point determined by the engine temp, ready for the next start. Once the engine is started it motors in relation to the engine temp and idle load of the engine. Idle speed is not directly controled by the steppper."

 

 

Sprocket's threads pinned in the injection section are invaluable to an spi owner.

Edited by humph, 26 May 2021 - 12:56 PM.

[timmo]

That's great, many thanks