PCM 16196396 Range selector 4L60E?

[Rob 689]

Since getting the fueling dialed in i only get knocks when i first start it when it fires initially and then sometimes when i sbap the throttle and under power enrichment. I reduced the power enrichment table and i think that solved knock retard i havent seen it come back since but the knock counts still pile up eventually even tho no knock retard occurs.

[Rob 689]

And the seat of my pants says its down on power when i get on it trying accelerate hard.

[ralmo94]

Since getting the fueling dialed in i only get knocks when i first start it when it fires initially and then sometimes when i sbap the throttle and under power enrichment. I reduced the power enrichment table and i think that solved knock retard i havent seen it come back since but the knock counts still pile up eventually even tho no knock retard occurs.

Counts are normal, if its not retarding its fine. If you wish to dial in timing there are several write ups on it.
My advice is take it slow

On the third gen forum there was a spreadsheet for creating a spark table.
Just remember the heads don't like as much timing as the old open chambers, and 87 octane probably doesn't tolerate much if any more than stock unless you have a big cam that bleeds off compression.

I think I would try changing the zero's to 2's and log it and see if retards, if no noticeable performance increase I would put it back to stock. just my $0.02

[ralmo94]

http://www.gearhead-efi.com/Fuel-Inj...gnition-Timing

Here is a thread I started asking the community about spark advance.

Stevo's reply in post #8 was a really good explanation

[PlayingWithTBI]

Counts are normal, if its not retarding its fine. If you wish to dial in timing there are several write ups on it.
My advice is take it slow

On the third gen forum there was a spreadsheet for creating a spark table.
Just remember the heads don't like as much timing as the old open chambers, and 87 octane probably doesn't tolerate much if any more than stock unless you have a big cam that bleeds off compression.

I think I would try changing the zero's to 2's and log it and see if retards, if no noticeable performance increase I would put it back to stock. just my $0.02

Is this the one you're talking about? 84Elky posted it here too.

https://www.thirdgen.org/forums/diy-...ml#post6301288

[ralmo94]

Yes I believe that is the one. I remembered it having a pretty good write up along with it too

[tayto]

pretty common to see knock counts on startup and shutdown. tip-in knock counts could be timing related or fuel mixture. TBI heads don't need much all in timing they are an efficient chamber. 25-30* all in. Cruise will like mid-30s to low 40s, this is not your "regular" 36* all in SBC head, so try and not pay attention to too much you read on the internet...

[Rob 689]

pretty common to see knock counts on startup and shutdown. tip-in knock counts could be timing related or fuel mixture. TBI heads don't need much all in timing they are an efficient chamber. 25-30* all in. Cruise will like mid-30s to low 40s, this is not your "regular" 36* all in SBC head, so try and not pay attention to too much you read on the internet...

What are the consequences of too far retarded ignition?

Aside from ridding it of knocks how do you know what it needs for peak power or at least as close to there as humanly possible without a dyno.

[Rob 689]

Counts are normal, if its not retarding its fine. If you wish to dial in timing there are several write ups on it.
My advice is take it slow

On the third gen forum there was a spreadsheet for creating a spark table.
Just remember the heads don't like as much timing as the old open chambers, and 87 octane probably doesn't tolerate much if any more than stock unless you have a big cam that bleeds off compression.

I think I would try changing the zero's to 2's and log it and see if retards, if no noticeable performance increase I would put it back to stock. just my $0.02

Thank you. Yeah i probably wont mess with timing much really until i get the vortec built and swapped in. I might try changing the zeros to see like you say. gotta finish the fueling first i think.

[ralmo94]

Thank you. Yeah i probably wont mess with timing much really until i get the vortec built and swapped in. I might try changing the zeros to see like you say. gotta finish the fueling first i think.

If you swap vortec heads, I would start with a stock vortec timing table then