New 345 SV engine data

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I drove down freeway for about 8 miles, then turned around and came home. The way down the blm were appx 120, on the way back it jumped to 150??:( I noticed the o2 sensor was all over the place and the iac jumped with the blm?


Time 771.5 getting on freeway
time 1373 making u turn
time 2035 getting off freeway
 
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Well it's a strange one. I see no data between the logs to show something the same that would cause it.
It's possible to just be a bad o2 sensor but I would recommend checking your grounds.

But it definately goes to 150blm at about 180*.
 
I will double check the grounds with an ohm meter. All grounds are connected to the rear of the engine on the passenger side head. The battery ground is connected to the drivers side head.

The motor is running at 180*, but when I do the u-turn it goes to 182*, then back down to 180* is there anything that temperature sensitive? I have a spare everything in my FI box. What about the iac?
 
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I know you looked, but help me to understand whats going on.

Here I'm on the freeway engine is warmmed up and just left the house.
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Now 8 miles later getting off the freeway and turning around.
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Just got up to freeway speed.
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Now at 150 blm. I noticed the iac is a lot higher too.
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There is a lot going on so I will have to be brief.

You have to compare temp, map, and tps. All these play a part in the fuel pulse width. Along with the pulse width is the iac steps based on the table.
I would have to look up your bcc to see the iac table(later tonight).


But if you look the blm normally drops(goes Rich) as you open the throttle, map goes up/tps goes up.
Then as you let off the throttle the fuel will be decreased as you decel and the blm goes higher(goes leaner).

Now if you step on it harder like on the freeway ramp...the tps and map goe up a lot...this will put the ECM in power enrichment mode and it will add additial fuel and timing.


Now when I went back and looked at the log from the 29th...the data all seemed to flow and the blm's all appear to be correct. Leading me to believe it's more of a program adjustment then a fault with the system.
If the fuel went real lean(170) while accel then I would be more concerned.
But yours seems to be leaning as you go to light throttle/coast.

Is there anyone around you that can program a chip with an adjusted file?


As for the timing connector...the engine must be off before it is reconnected. The ECM should also be unplugged to clear the 42 error code that normally happens when running the engine with the bypass unhooked.
 
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I think it May be from blm learning. You are mostly lean at low loads (low map kpa). I think you need to tune the fuel to correct the blms. You have constant power to the ECM correct?
 
ldo_marlin said:
I think it May be from blm learning. You are mostly lean at low loads (low map kpa). I think you need to tune the fuel to correct the blms. You have constant power to the ECM correct?
Click to expand...

Yes I have constant power to the ECM, via a relay. I followed bills write up on the bb. It's powered off the battery via a fuse.
It does look like the ECM is learning and decides on 150

bill, I contacted Jeff and he does not have the burner yet, he said it's coming soon. He does have an afi chip for an auto/345he said I could try. Your correct, the blm goes high with light throttle/coast and just maintain speed. Blm drops if I gas it like getting on the freeway.

I did reconnected the est timing by-pass while the engine was running. I will disconnect the by-pass, check engine timing. Turn engine off, reconnect by-pass and unplug and replug ECM. Then check that the timing Mark moves when I give the engine gas to ensure the ECM is controlling timing.
 
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I am working on Jeff's programmer. I'll test it towards end of week and he should have it next week. If you want a chip programmed, send the bin to me. I'll program it and send it with the programmer to Jeff.
 
The hollister trip is this weekend:icon_neutral:

maybe bill could send you the bin:winky: and then you could burn and send me the chip. I pay for the shipping and chip. Depending on where you live as to the method of shipping. If your in cal. Priority mail is like 2 days. Or use fedex two day.
 
Well I adjusted yours so "if" I can locate my burner and find a blank chip I will see if I can burn 1.
Send me your name and address just in case.
 
The afi chip made a huge change. It now runs at a blm of 108 most all of the time. Can I run this chip and drive 200 miles? Or should I wait for a new chip for my motor? I know bill you have mentioned changing the fuel pressure to adjust for a Rich condition, not sure it this is too far out. I have another TBI unit with the 5.3 injectors vs my cop cars injectors I could install. :icon_eek:
 
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bill usn-1 said:
well I adjusted yours so "if" I can locate my burner and find a blank chip I will see if I can burn 1.
Send me your name and address just in case.
Click to expand...


Sent you a p.m. On the address. Let me know if you locate your stuff. I think I remember reading your using a flash chip with a socket adapter vs the older one that get put in the (as Jeff calls it) ghost buster box..
 
Bill told me the broadcast code of the chip I had was for a 7.4l big block and the cop car injectors are not big enough. Hence the computer had to compensate and add more fuel.

I have 2 other ECM and bill told me those were for a 5.7 auto and manual. He said to find some regular 5.7 injectors to put on the Scout .
Digging through all my stuff, I found "gm5285203 4.3l", "gm5235279 5.0l", plus the cop car ones on the Scout and "gm5235231 7.4l" but no regular 5.7:icon_eh:
I can check picknpull for some 5.7's tomorrow.
 
I was going to try that too, thanks again for all your help.

I put the 5.7 auto California emission ECM in and took it for a drive. Runs way better. Will log more data in the morning.
 
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Wow, can't wait to get the FI dialed in with the right chip.

The data is not too bad. I could turn down the fuel pressure a tad with these 65lbs injectors or do what bill suggested and install the 5.0 40lbs injectors and bump the pressure.
 
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Since I only have one day left, I decide not to try the un tested 5.0 injectors and instead lowered the fuel pressure from 13 to 12and logged a little data. Looks better, I thought 1 psi would make a bigger jump, but I think I'm good for the trip.
 
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