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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?
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82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!
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???
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82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!
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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'86 GW "Troubled Child" tc.wagoneer.org
360, TBI, 4" Skyjacker, 33" BFG MTs, WT D44+ARB, WT AMC20 + LockRight, CB 2m 6m 70cm, K0FSJ
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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...
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?
82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!
Grand_Wag_85 wrote: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.
Grand_Wag_85 wrote: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.
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.