Can Anyone help me with an idle tune?

[vlad01]

Dylan ftw!

[VL400]

Awseome job Dylan and prolectric.

I know this site is a little biased towards a delco ECU, but remember every system is only as good as the tuner. Can royally botch up any tune!

[prolectric]

Was able to do everything I needed before final tune like fill trans and check fan operation etc
Although I'm having an issue getting it into diagnostic mode so I can set 10degrees. From memory when the circuit at the aldl is bridged the idle normally lifts? I'm not getting any change.. And I'm wondering if it has anything to do with the ice ignition system? It works by using the coil pulse circuit from the factory module to switch the ice 7amp module
Gets its final tune next Thursday

[MAGP]

From memory when the circuit at the aldl is bridged the idle normally lifts?

Never in my experience

[Holden202T]

I find the opposite, the engine nearly stalls with the drop in timing, but once it stabilises it works ok, then removing the link the revs go back up for a moment.

[jenko]

I find the opposite, the engine nearly stalls with the drop in timing, but once it stabilises it works ok, then removing the link the revs go back up for a moment.

same as, but my idle timing is around 28 degrees btdc but if your idle timing is around the 0- 5 btdc then the revs would go up.
But I doubt that Dylan would have idle timing at those specs

[MAGP]

Base timing on an unmodified delco used to be 10 degrees. Once the engine is running and idling it goes up so lifts the idle speed. Put a jumper in the aldl and you are forcing base timing so it should drop back to 10 degrees and the idle speed should also drop accordingly.

[Dylan]

From memory normal running idle timing was 28 degrees on that. What you have while running now?
What pin did you bridge to ground?

[antus]

Idle timing will be all over the shop as the ecu adjusts it on the fly to smooth out the idle. When you ground the diag pin you will get a static 10 degrees. If you dont, physically adjust the timing at your point of engine position reference (be that in the distributor or elsewhere).

The actual sync depends on the ignition module your using but you should get 10deg out regardless (and in the logs)

[prolectric]

Ah right I knew the idle was gonna change one way or another.
Mine doesn't move and I'm bridging the white/black to earth.
The other issue I have is it runs a custom crank hub and blower pully so there no permanent timing Mark for TDC which is painfull