Im still tracking down an issue. I cant see much of whats going on at all since i dont have an aftermarket computer.
So What i really would like to do is to see if the injectors cut out at all when idleing by sticking LEDs in the injectors?
Anyone ever try it and would it work?

I know they would have to be in the correct way Since LEDs only run current one direction most of the time.

Unless anyone else has an idea on how to see if fuel injectors cut out Intermintently?

 

You can at the ECU because it's easier than at the injectors.

But at idle, the flashes are going to result in an almost steady light. The gnd pulse happens in ms and a lot of ms stacked together result in a steady LED light.

On the series four, at the ECU, you'd just put the positive wire of the LED into the small plugs wires at the far left of the plug (looking into the wire side of the plug). Then put the other wire of the LED into either the light green wire (fwd primary injector) or the light green/black wire (rear primary).

Then start the engine. While the starter cranks the engine you will see the flash of the LED pretty easy. But once it idles the flash will turn into a steady light display.

If you have a series four car and the idle is in the 750-800 rpm range but seems to mis once and a while at idle, the cure might be to go to the variable resistor and turn it RICHER. That usually smooths out a idle that appears to be *missing* occasionally.

 

yes i have a S4.. Ok ill give it a Whirl. thanks alot hailer.

 

um, or you could use a noid light, it does exactly what you want to do, but like hailers said, it would probably be easier to get to the ecu, seeing as getting at the injectors would be difficult

Lloyd