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383 Marine Intake Issues Cold Start & Cranking VE (EFILI
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you must have missed copying some LS1 injector tables over because the small pulse adder table is most definitely from the poppets, they're the only injectors that show a negative small pulse adder like that. A0008 is a muliplier, so cranking it up adds fuel, especially in low temp situations...I don't know what you mean 'keeps it in order with AFR while warming up"....the multipliers I'm refering to are the after start enrichment and additional after start enrichment, and a few others. I need to get my tuning laptop out and I'll send you an altered version to try....but even then I'd still suggest re-checking the VE..

Brendan, I don't know what to tell you. if you want me to take a look at your current tune, I can, but idle and starting stuff is VERY difficult to nail down. it took me hundreds of logs and tunes to get mine the way I like it. did we ever work on your spark tables? I can't remember what exactly we did last time I saw you. you might also take a look at your spark, especially if the idle quality is low.

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Okay, I sent you a slightly altered tune. give it a shot and see if it does any better. however after looking at things in the tune, it is a VERY heavily altered tune, you've got large spark changes, large airflow alterations, fueling, etc. so I don't think you're looking at something simple that is only fuel related, I think there are probably alot of factors playing a role and adding up to cause the issues you're getting. (BTW what is with the strange spark tables?)

the main things I did in the tune were to disable the additional after start enrichment...which, if you're rich while starting could be playing a role, I left the regular afterstart enrichment alone.
I lowered A0008 to a little more sensible amount.
your commanded fuel while cranking was pretty low, and I understand where you were going with that one, but I don't think this is ONLY a too much fueling problem, so we need to eliminate some variables, I returned it to stock L31 values.
I changed the small pulse adder table to LS1 values, the other injector tables look correct for LS1 injectors, it just looks like the one table was missed.
I returned B4343 to stock since it was excessively modified at almost 4x the stock values. again trying to eliminate variables
I also put in some values for B4304 that I've used, your table was just one value for all ECT's, the values I put in are a little higher than stock, but not tons

give it a shot, I don't know how much of a difference it'll make, and it likely won't be perfect, but see if it's better or worse, then go from there. I think your VE table needs some attention. I question some of the values in it, if you can get that straightened out and then re-do the cranking VE, that should give you the best results.

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Honestly I havent done anything with it since we last met and that was doing the RAF stuff. It did help alot tho. I dont think its far off I just have a stumble at idle and sometimes have to hold the throttle for a sec when I start it and sometimes it fires right up. It depends alot on ambient temps and ECT as well. Cold starts almost seem better than hot starts

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yeah, there are things we could work on, we'll have to get together and do some more tuning, maybe have a BBQ or something since the weather is warming up.

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Awesome!! I will plug it in tonight and give it a try.

The tables that were off for injectors and B4343 were just being tested to see if I could restrict fuel flow when cranking.

I see where you are going with the after start enrichment tables. Truck will pop off like it wants to fire but then acts like someone dumped a gallon of fuel down the throat of the intake. Hmmmmm, might be onto something. Thanks!

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no prob. I actually have both the after start enrichment, and additional after start enrichment disabled on my tune. but I've got several things quite different...if you'd like I can send you a copy of one of my tunes to look at (just remember I've got a very different setup, so some things won't work correctly for your setup if you use it, or try to copy it, mainly the 24x reluctor stuff)

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So I put the new tune on the truck and nearly fired up and idled!! All i have done was bump up the B4343 and it pretty much runs on its own without touching the gas pedal. Run it for a few seconds until the coolant is 80 degrees and restarts are perfect!!

It is a fry cry from the setup i had before, but do you think i should disable both enrichments? Still just a hair rich when cold start. I will test it again later tonight after it cools off.

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you can give it a shot, if you don't like it you can always change it back. perhaps just lower it to begin with rather than completely disabling it.

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Is B3632 the correct table to decrease closer to Zero for this procedure? What factor does B3662 play in this (if any)?

Thanks!

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yeah, B3632 is the enrichment amount. try lowering it 10% and see what happens. as I understand B3662, it is a factor that alters the afterstart enrichment amount at restart based on how long it has been since the vehicle was last started, I wouldn't change B3662

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