2002 chevy tracker Palmer Log files

oldphotonut · 10-25-2008, 09:25 PM

I was originally going to send this data in a pm to jtgh, but since I couldn't figure out how to send attachments via pm and it seems that my personal data is not in the log files. . .

Here they are.

2002 chevy tracker with 64000 miles on it. 4WD with auto hubs and automatic transmission. V-6 engine. Transmission has O/D lockout and Power settings.

4 doors

You must have Palmer software to read this data. If anyone wishes to convert this data in to something that everyone can use- feel free to do so. This data is for everyone to compare, keep, save, distribute as you see fit.

If anyone sees anything that might have my personal information in it, please let me know. I don't know how to convert this data in to excel/wp/ whatever but I'm sure that someone can.

This rig had no codes or pending codes and as far as I can tell- it runs perfect.

Good luck everyone.

jtgh · 10-25-2008, 09:45 PM

thanks, i will process them and plot MAF to RPM
and post the plots.

i looked with hexedit tool and notpad and its 100% binary.
will look in palmer PCMSCAN, next

oldphotonut · 10-25-2008, 09:58 PM

Cool- so it's readable as is.

It's amazing how much air this thing can go through when you're at 6000 rpm. Always try to do 1 hard acceleration to see what the sensors do.

I didn't check the fuel flow, but I checked the mileage and wasn't really all that impressed, but the wife likes to idle a lot and she does a lot of in town driving. . .

Anyway, hope this helps someone who might be having problems. It's a reference point anyway. I have to do the explorer and the pickup next. I just try to combine errands (since I have to go in to town anyway). I don't like wasting gas (even running a diagnostic).

Two of the log files have hard accels. First one is going in to town and the second one is going uphill (although it was just out of town). First one done with O/D switch set to engage and the Power switch off. Second accel is with both switches flipped so that power light and o/d off lights were on.

If anyone has any questions, I'll try to answer them as best I can. I don't know as much about this rig as I do the sidekick (and I don't know that much about it).

Good luck everyone.

jtgh · 10-25-2008, 10:03 PM

ohhh,
on frame 85 , uphill you hit 109g/sec air flow, 5650 rpm 93km/hr
nice data.
then you released the hammer, and the o2 when super lean, (injection cut) 10:1 cut.

no personal data. just numbers.

they just store it in a very compact symbolic way.
obviously saves hdd space.
really nice tools
i will show plots
and then post the excel data.

eport is under tab logging,+ export select all , export , wait, done
you now have csv file that excel can load
more next post

oldphotonut · 10-25-2008, 10:10 PM

On frame 86 I was coming up on a nice sharp corner and was putting the whoa back on it.

Wheel sensors would have been hot by frame 87. . .

jtgh · 10-25-2008, 11:11 PM

here is the exported csv, that loads to exel perfect
so i charted (dual)
vss and maf

left vert axis is speed in mph and g/sec

horz is time stamps in file.

nice data , thanks for sharing.

now we know it is possible to nail 109 grams / sec. air flow. on this buggy.

cool.

i would have guessed 80 max.

really the maf sensor is the most important sensor to have data on.
as there is NO factory spec on it.
save 10g/s at 2500 rpm in neutral ( wow that is really helpful ,not)

we learn it is 10 times more under load !

happy trails.

oldphotonut · 10-26-2008, 07:34 PM

Thanks for plotting the data in to something that is useful to others. . .

Good luck all.

jtgh · 10-26-2008, 09:54 PM

thanks for collecting up hill. no where else is this data.
it show the whole ball of wax there.
it is very nice of you to post it !!

hip hip ,hoorah.
Smash glasses..

oldphotonut · 10-27-2008, 04:45 AM

It's easy to do- I have to go uphill all the way home. Part of the reason that I'm concerned about the sidekick's new cat-con. It's a short drive up to the house and unless I warm up the kick- it runs rich all the way there until the cat fires. . . usually not until I get home and shut it off.

O2 sensor readings on the tracker show that rear O2 works fine on it, but it swings wide on the kick- even with the new cat.

So. . . I'm thinking that maybe I dinged my old 'gasket' above O2 (B1S1) and I should probably change it. It might be letting in air and running rich, but problem is I don't know if that's the problem or if it's only part of it. . . .

In any event, even thought the sidekick has no codes active or pending- I've still got a problem and I need to cure it if I'm going to keep from frying my new cat.

Wish me luck.

jtgh · 10-30-2008, 12:39 AM

those swings are just fast transients, and the presented waves are the software interpolating the data.
so it is guessing. what is real is the data points, (they can be enabled these points, and show as tiny squares) .

as you drive some oxygen leaks past the Cat con,
it is really spikes of oxygen , tiny amounts.

the software is slow and missing most of them and just get a few here and there.
then the software fills in the dots and the wave form, is not real.
only the spikes are real.
it can not digitize properly the spikes as they are too fast.

The reason this happens the spikes , is because the ECU purposefull cycles the cat
rich and lean (waste fuel) to keep the cat aliver and light off
i red the cat passing the 420 test is 96% effiecient or better.
which yours is, no light.
I call this tickling the cat, the ecu tickles it and the o2 rear can see just a tiny amount of oxy (during the lean cycle) leak thru the cat (as it goes too lean) and is picked up.
you can see i on a real scope as it really is.

short runs will only make more smog and will no hurt the fuel mileage.
or effect tune in any way.
that is how i under stand it.

cheers.