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New 3 wire O2 and some results.

cuervo

cuervo

Runn'n down a dream!
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This is on my 91 with a GMPP HT383 crate that has the bored out 350 TBI and larger injectors. I think 80ish lb. 454 injectors, I'd have to go back and look it up.

I had the old 1 wire and changed it out for a newer 3 wire. I have a very steady 13.4 volts to the O2 sensor when running.

I disconnected the battery for about a half hour. Then reconnected and hooked up my laptop running datamaster.

Now, the O2 sensor fluctuates after warm up. It will range from 8xx.xx to 4.0. When it gets to the 4.0 it starts to surge a little and the idle goes up to about 1200.

Something else I noticed. The Air/Fuel Ratio sits steady at 14.7 but at WOT drops to 11.3. I assume this can only be changed by more pressure or a spring change.
 
WOT dropping to 11.3 is a good thing. The ECM does not use O2 sensor feedback at WOT. It refers to a comanded AFR but the rest of the tune needs to be correct for it to be correct.

O2 sensor is also supposed to change low to high, above and below stoich 14.7 AFR but yours is going to far probably because of the tune.

Are you running a stock chip? What ECM number? What fuel pressure? What's timing set to?
 
Timing is at 0 with the wire disconnected.

Not sure on the ECM, but the chip is a custom burn from Harris Performance and I'm on my second burn from data I supplied but all of that was from the single wire non heated O2 sensor.

I drove around for about an hour to get some new data to send off.

I didn't know 11.3 on WOT was good. I thought with a lower ratio it meant a lean condition was happening.

For some unknow reason, I can't get winaldl to read data. When I open the configuration window it says com port1 "OK". I'd like to get hat working since there seem to be more people here that understand that data.

edit

I think I remember my issue with winaldl being that my ECM was not supported. So, I'm pretty sure I don't have the 7747.

/edit
 
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What ECM? 91 should be a 1227747 ECM but probably a differant number.

Lower than 14.7 AFR is rich and higher is lean.

Heated O2 sensor will not change recorded data just give you more data from Closed loop as it heats up faster.

Lots of performance chips programmed a open loop idle so it wouldn't help there either. Post up your data and I'll take a look. If you have your .bin file post it up too.

What are the cam specs in the new motor?

What are the issues again? Driveability, idle, power, etc...
 
My suburban is a 3/4 4l80e and I believe it uses the ECM 7076 and AWBK.bin.

The surging is happen at idle to about 2000 rpm after it goes closed loop. It goes closed loop with in 3 or 4 minutes.

The engine specs are:

Compression Ratio- 9.1:1

Block- Part # 10105123 Cast iron, 4 Bolt main, With 1 piece Rear main Seal
Crankshaft- Part # 12489436 Forged 4340 Steel, Externally Balanced.
Connecting Rods- Part # 12497624 5.7" Powdered metal.( special design for 383)
Pistons- Part # 12499103 Hypereutectic, Dished top , With offset pins.
Camshaft-Part # 14097395 Billet Steel Hydraulic Roller Camshaft.
Intake Lift- .431" Intake Duration @ .050" 196
Exhaust lift- .451" Exhaust Duration @ .050" 206
Lobe Centerline-109


I'm going to do another run after dinner tonight and zip up the before and after sensor upgrade.

Thanks for the help.
 
I am curious about the 16147060 ECM. I found out it uses definition $85. I also found out the 16147060 uses a 32K bin file. I am also curious about the Datamaster file. If you want, send me a PM for my email address, and I'll look at the Datamaster file.

dave w

ECM 16147060.jpg
 
dave w said:
I am curious about the 16147060 ECM. I found out it uses definition $85. I also found out the 16147060 uses a 32K bin file. I am also curious about the Datamaster file. If you want, send me a PM for my email address, and I'll look at the Datamaster file.

dave w
Click to expand...

I found the AWBK .bin file. Basic TBI file.

dave w

ECM 16147060.jpg
 
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dave w said:
Yes.

The Moates.net Burn2 will read the 27C256 chip used in the 16147060 computer.

http://www.moates.net/burn2-chip-programmer-p-197.html?cPath=64

If you want to snail mail me the chip, I'll read the chip and snail mail the chip back to you. I will email the chip file file.

dave w
Click to expand...


Hey Dave,

I sent you the two datamaster files. One from before the new O2 and one from after.

I do appreciate the offer but this is my DD and don't think I could have it down that long. If I paid for FEDEX both ways I could purchase the burn2, which I just might do.
 
cuervo said:
Hey Dave,

I sent you the two datamaster files. One from before the new O2 and one from after.

I do appreciate the offer but this is my DD and don't think I could have it down that long. If I paid for FEDEX both ways I could purchase the burn2, which I just might do.
Click to expand...

I hope you don't mind me showing the DataMaster files.

Your running RICH!

The Histograms show the data very well.


The last pic is from a different engine that runs very good after some of my tuning.:D

dave w

383a Short Term.jpg

383a Long Term.jpg

383o2 Short Term.jpg

383o2 Long Term.jpg

DataMaster 01.jpg
 
wish I knew what all this stuff meant, seems pretty cool and important once I stop sucking off my carbs nipples
 
Long shot but does it surge without your aldl connector plugged in? My first try at logging we had the cord set in ALDL mode which caused high idle and surging and more timing and such.
 
cuervo said:
Dave do you see anything that might cause the closed loop surging?
Click to expand...

I've posted screen shots showing where a surging event is occurring. The long black line is on a recorded 2800 RPM surge. Moving the long black line in playback mode will freeze the data at the moment, so the data can be analyzed. The red line is RPM and as the red line moves up and down the RPM is recorded / data logged.

The first thing I would do if your truck was in my shop is reprogram the PROM, to obtain an ideal historgram (running rich / lean). Trying to fix the surge before getting the histogram correct is not a good plan.:doah:

At this point, I'm almost 100% convinced the surging is caused by the RICH running PROM programming. I found nothing in the data log to indicate a sensor has failed. The data log shows the sensors change readings, so sensors like the O2, TPS, and CTS sensor are working. A failed sensor will not change readings. The IAC is also changing counts, so I am convinced it is working also.

dave w

383o2 Long Term-01.jpg

383o2 Long Term-02.jpg
 
I'm not familar with DataMaster, what is the black line that spikes a couple times in the graph?
 
eagle mark said:
I'm not familar with DataMaster, what is the black line that spikes a couple times in the graph?
Click to expand...

Red line is RPM

Black line is Spark Advance

Magenta (kind of a pink color) is vehicle speed

The really long black line is a pointer, so at that exact point in the data log the information can be analyzed.

I think the spark and and rpm are spiking because the ECM is trying to compensate for rich running conditions.

dave w
 
OK so the long black lines are set by you, not a spike, correct?

Number one issue with running rich is a vacuum leak. Although that may not be the case here.

One thing he could do without chip burning equiptment is to change the injectors back to the 350 injectors. They will run fine in a 383 till WOT high RPM they run out of fuel...

I think he said he had a mail order chip and the Big Block injectors should be accounted for in the chip.
 
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Well, I'm not sure why but my fuel pressure gauge is sitting at about 52 lbs or so. It has an 18 lb spring in it. I'm wondering if the spring or something has failed. I'll pull it apart tomorrow if it warms up above freezing.

I'm gonna be on the safe side and order the adjustable spring today.
 
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