ignition timing

[krazy*k]

Help needed my timing keeps changing
How are u all timing it up??

Also I read when u unplug the blue temp sensor revs should go up but mine go down

Could this be a reason y she wont time up properly.

Thanks for ur help the G is being to kill my patience

[hayesey]

I assume you are talking about ignition timing?

When you unplug the blue temp sensor the revs will change, not always up, it depends how the timing is set but they should be steady.

Then using a timing gun set the advance to +5deg (+ or - 1deg).  That's it, it can't move unless the dizzy is loose.

[Andy]

When you say the timing keeps changing what do you mean?

With the blue temp sender plugged back in the Digifant ECU is actively controlling the overall ignition timing to achieve its target idle speed, so you'll see the ignition timing jump all over the place in this condition.

You unplug the blue temp sender to stop the ECU from making timing corrections, so it just runs base timing allowing you to set the idle speed and base ignition timing.

[krazy*k]

Right timed her up 6 degree advance on the right hand marker with the blue sensor uplugged, plugged the sensor back in so what should the timing gun be set at to check it at idle ? Could someone please check theres as I had to change the gun to 14 degrees on idle

Thanks

Also would the idle control valve be the reason why my idle is never the same it always drops to low flicking the battery light on and off

[Andy]

Ignition timing will vary at idle once the blue temp sender is plugged back in. Factors affecting it include air temp, coolant temp, idle speed and manifold pressure, so there's no one single figure I can give you.

Idle control valve is actually just an auxiliary air valve, it doesn't control idle speed. All it does is provide an air bypass around the throttle body when the engine is stone cold. Once it's warmed up a touch the valve closes and plays no further part in running the engine. There's also an electric heating element in it (hence the two wires going to it), so it starts to close up with the heat from that as well as the heat from the water pipe it's bolted to.

As I said before, idle speed is controlled by the ECU varying the ignition timing. Once the engine/aux air valve are warm air flow is determined by idle screw on the throttle body. Fuelling is taken care of by the lambda.

So if you've got a shitty idle, sort your ignition timing first (sounds like you've done that), then set idle speed (~900rpm ish) with temp sender out and see where you're at. That assumes that you've not got any air leaks. If all of those check out okay, then I'd check the throttle body's clean and not sticking and then be looking at your lambda sensor.

[krazy*k]

Ignition timing I believe is done :-) just a quick question tho do u time up to the left hand mark or the right ?
She has had a new lambda
Air leaks well thats a different question lol
If I had her idling at 900rpm she would drop even more