Hate to ask, but I need clarification on ECM "Initial Advance" parameter.

[damanx]

Until my eprom reader shows up, I might have access to one at work. I need to rip the bin from the eprom currently in my truck.

The biggest question at hand is that I am unsure of the timing. But that is not the only confusion. I keep reading various posts about where to set initial distributor timing. Most posts, people state 0 degrees, but then in posts where I have asked this question and the response was that the distributor mechanical setting should match the "Initial Advance" in the ECM prom program.

Now, hopefully, tonight I can rip the bin from the current bin I am running, ACHT, which there is not a bin online for, and see where it is sitting.

The emissions label for the truck I pulled the ECM and TBI system from stated initial mechanical to be set at 10 degrees, but, I'm not sure that the ecm is the matching for that truck.

Anyways, can someone declare for fact that the distributor base timing is supposed to match the bin "Initial Advance" parameter?

On a side note, I noted that the ANFJ bin for the 1228062 ecm shows the Initial Advance at 28 degrees, seems kind of high, but that is what the bin shows, AND, one of the reasons I ask this question.

[EagleMark]

Anyways, can someone declare for fact that the distributor base timing is supposed to match the bin "Initial Advance" parameter?

Yes!

On a side note, I noted that the ANFJ bin for the 1228062 ecm shows the Initial Advance at 28 degrees, seems kind of high, but that is what the bin shows, AND, one of the reasons I ask this question.

ANFJ is $4E for a 2.8L TBI HO engine and Initial Base timing is 9.84 degrees. Same as other one similar as yours we have I checked for you.

Not sure how you found 28? Sometimes there is DIS ignition and the base or Initial advance is way off what we are used to seeing in TBI, I thought that may be the case, but not...

So yes, your distributor should be set to 9.84 (10) degrees advance with bypass wire disconnected.

[damanx]

The ANFJ bin, downloaded from the 1228062 thread, when opened in TunerPro RT, shows initial advance as hex 1C which is decimal for 28.

Is there a mistake in my conversion of 1C or is there a mistake in that bin?

[EagleMark]

Well your right 1C is 28 in decimal, but with the conversion built into TunerPro so it is a real life number using X*0.3515625 it comes out to 9.84

[damanx]

AHHHHH makes sense.

How did you/do you get tunerpro to show the real life number instead of the hex value?

GOT IT!!

talk about a duh moment....

[EagleMark]

Right click on the open Parameter window and choose Raw Hex or Calculated Values.

[RobertISaar]

initial advance is always a tricky thing to mess with.... some masks, it does need to match what a distributor is set at, others it's simply the first commanded spark advance event. this is true of MOST 60V6 applications. for the applications that use it as such, there is also a "reference pulse angle" value, it's used to tell the PCM how far ahead of time to expect the reference pulse so it knows when to start the next spark event. with 60V6 stuff, it's usually 60* with an initial advance of 10*.