First 258 datalog

[Grand_Wag_85]

Doing my first datalog for the 258.

Here is a sample photo at idle speed. Appears my injectors are WAY over their duty cycle, to the tune of 600%! I guess that explains why it runs so rich.

Also my idle appears to be right at 1500 RPM's, not good. Definitely gotta fix that.

Also noticed my ignition timing seems to be "hunting" a few degrees at a time before sweeping the entire gauge from 0-40, hovers at 40 then drops back to zero.

7747 ECM.

Where do I start?

[Grand_Wag_85]

One more question is could any of these odd-ball reading be due to using a BIN for a 5.7 V8 in the TunerIT program? Still a little fuzzy on that aspect, does the BIN file I need to use in TunerIT need to match what the ECM came from or does it match the tune in there now? If the later can I take the BIN from the chip using the autoprom to read it?

Also noticed my 02 reading swing wildly from rich to lean and at the 1 second intervals the readings are on opposite ends of the chart. 02 sensor voltage goes from as low as 2 to as high as 900.

The knock counter swings from 1 to 300. I don't have the knock sensor hooked up???

[shimniok]

A hack has to be applied to read timing. So that probably explains what you're seeing there. I see the same when I haven't applied the hack.

How rich does it appear to be running based on driving, BLMs, smell, etc.?

How are you connecting to the ecm to read aldl stream? With a certain unneeded jumper it can force the ecm to 1500 idle.

I would lean towards matching the bin and injectors and displacement. That is to say, a bin and injectors for a 3.8L or 4.3L 6cyl might be a better starting point. Less fuel required since there are 2 fewer cylinders and 1.7L less displacement. I had loads of trouble when my injectors didn't match my bin's application. You end up messing with parameters that just make life harder than necessary IMO.

Are you using 5.7 injectors?

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[shimniok]

PS: I have at home a 7747 for a 6cyl Astro van. So I know there is at least one 6cyl bin for that box. I bet there are plenty more. Check gearheadefi forum to find various bin's for 7747...

http://www.gearhead-efi.com/Fuel-Inject ... rmation-42

I think my box has AKDX (4.3L) but you may want the manual version, APAB. Then use injectors for the corresponding 4.3L Astro van.

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[Grand_Wag_85]

That makes sense about the hack, was wondering what that was all about.

I bought my system as a kit from "Performance Fuel Injection Systems" so whatever injectors they put in with the kit, probably for the 350.

Smell wise it doesn't smell overly rich from the tailpipe but I do get a code 45(?) while driving especially if I'm going up and down hills.

Using the AutoProm.

I'll search for the Astro BIN-Downloaded.

[Grand_Wag_85]

This is the ECM. What chip is this? It is a 24 pin. Was going to read it from the AutoProm but can't get the plastic holder off

[FSJ Guy]

Geared EFI has a bunch of stock bins. The plastic holder can be pried off carefully. Then you can read it with the Autoprom.

I'd go with a 4.3 bin to start. There's a way to adjust for the injector size It's been ages since I've played with the 7747 ECM, though.

[FSJ Guy]

Ha ha. Oh, Michael already told you to to go to geared. Never mind!

[Grand_Wag_85]

Thanks guys. BTW what is BLM measurement?

Mike, how does one do the hack?

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[Grand_Wag_85]

Ethan that was really tricky to get the chip out but I did it. Prolly won't reuse the plastic holder.

[Grand_Wag_85]

OK,

Got the chip in the AutoProm and facing the correct way.

In Tunerpro I closed whatever BIN I had open then initialized emulation hardware, downloaded bin from emulator to tunerpro and download current bin from emulator to file.

Looking thru the Scalars tab I see various settings. Are these the settings on the chip I'm plugged in to?

[babywag]

Obviously it's already a 258 modified .bin I would call them and ask what .bin they started with, and what size the injectors are.

No point in floundering around with a stock .bin for a 4.3 if this one is already modified well enough to run a 258.

[Stuka]

Doing my first datalog for the 258.

Here is a sample photo at idle speed. Appears my injectors are WAY over their duty cycle, to the tune of 600%! I guess that explains why it runs so rich.

Also my idle appears to be right at 1500 RPM's, not good. Definitely gotta fix that.

Also noticed my ignition timing seems to be "hunting" a few degrees at a time before sweeping the entire gauge from 0-40, hovers at 40 then drops back to zero.

7747 ECM.

Where do I start?

The duty cycle just indicate how long the injector is being held open for. It does not indicate if you are rich or lean.

Although with it be almost 600%, something is being read wrong. It cannot be over 100% per injector, as that means it is always open.

[AwesomeJ10]

Thanks guys. BTW what is BLM measurement?

Block Learn Mode (I really have no idea what that actually means)

anything above 128 is LEAN

below 128 is rich.

[Grand_Wag_85]

Thanks guys. Gonna try and data log again. Been reading every tutorial and watching every video I can find. Starting to make a lot of sense now.

Did notice when I was in the bin that the idle is set at 600, so I have to back that down at the TB.

Also noticed the ECU that came with my kit uses a smaller chip than the ones moates sent me so if I understand right I can read it but not burn it.

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[babywag]

Thanks guys. BTW what is BLM measurement?

Block Learn Mode (I really have no idea what that actually means)

anything above 128 is LEAN

below 128 is rich.

Not exactly...anything over 128 means the ecm is adding fuel, anything below the ecm is removing fuel.
Generally it's an indicator of fuel mixture, but the numbers can be misleading.
Especially if there is an exhaust leak before the o2 sensor, the numbers wouldn't be even remotely accurate to indicate rich/lean.

[FSJ Guy]

Correct. You can not write to a "stock" chip. You can only read. The stock chips used UV light to erase them, called EPROMs Electronically Programmable Read Only Memory. They work fine, but take longer to erase than what you get from Moates.

The ones from Moates (27SF512s, for example) are EEPROMS. Electronically ERASABLE Programmable Read Only Memory. This style chip can be read and re-written to by the AutoProm or Burn1/Burn2.

[Grand_Wag_85]

Pretty confident no exhaust leak is present. Just had my entire exhaust redone and my 02 sensor is in the stock location for the bad feedback

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[Grand_Wag_85]

BBD*

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[Grand_Wag_85]

Quick question, where can I find what the static time is set at in the bin?

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