Camaro350z28

thanks. some good info in there. process is learning slowly. i will probably read it 20 more times. trying to understand whats going wrong is whats confusing me.. all my numbers seem to check out except the sterm and lterm.. i also have not thoroughly checked as i didnt know what a lot meant. but with your page i will go back through my log and see if i can decipher some more of this.

HerbzHancock427

as for the temp gauge question you brought up. The temp gauge going up and down alot probably means you need to check your coolant level and bleed the 2 lines in front of the alternator.

Camaro350z28

nah, i have done all that, its the gauge or the sensor sending the bad reading. hooked up to datamaster it does fine its just the gauge thats going whacky so im pretty sure its probably the sensor in the head

Camaro350z28

what sensors could be causing my o2's to make it run horrible in closed loop? im almost positive its not the o2's. it did this before i changed them as well. what sensors can be sending bad readings to make the car run bad?

Guest47904

I didn't see one post where you told us about the O2 readings. I suspect one is not swinging like it should caused by a wiring issue. So what are they doing?

I had a problem with closed loop also. The computer would keep pulling fuel until the system maxed out lean. Then it would jump out to open loop, a few moments later it would jump into closed loop again. The PCM would pull fuel until the whole thing started all over again. In closed loop the idle would get terrible. Then for the time it jumped into open loop it ran good.

The whole problem was burnt wires. Gee were did I hear that before? You didn't fix them all and I have a real easy method to find and fix them as long as you can see the O2 readings.

So what are the O2 readings doing?

Camaro350z28

i put up the datamaster file but didnt notice you need an account, i will find a free site that does not need an account and re put them up.. the o2 readings look ok from what ive been reading.. but then again i am just trying to learn datamaster and everything.

ya i had burnt wires for the right o2 sensor, i soldered and fixed everything, so i think i guess that could still be the issue. lemme get those files up and i appreciate the help.

i was never trying to be rude or ignore peoples advice in this post at all so sorry if you think i am ignoring any instructions on how to fix my car. thanks!

Camaro350z28

can i send in email? having trouble finding a site that will let me do it where it doesnt require you to have an account

Camaro350z28

ok, here are some numbers in idle.

first start the car, open loop of course,

o2 mV 591 559

then through the whole open loop it rises slowly til

880-915 850-880

the hole time the left is usually 30-60 higher

soon as it hits closed loop it dumps all the way to

upper 300's upper 400's

slowly drops to

low 300's high 300's

bounces in and out of open/closed a couple times and the left side gets all the way to 800's while the right is in the 300's bounces around and pretty much they switch, 300's and the right is in the 600's.. it all bounces around pretty dramatically, down to 200's up to 700-800's.. higher the number rich lower the number lean correct? i dont know what it all means or how they are supposed to be but ill learn im sure after i figure out this car. any other numbers you need?

there were a couple revs to about 2300-2400 in there. i can take the car for a drive and record some underload stuff as well if anyone needs

Injuneer

Post the data log.... your description is impossible to follow. In open loop, cold start should be around 450mV (sensors don't work when cold), then as they heat up they will start to work and show the A/F ratio. If you have a functioning AIR pump, they will drop to about 00x mV/s. Then it will kick into closed loop, and they should start cycling quickly (about 9 times per second) between lean 0xx mV and rich 9xx mV.

If you don't have an AIR pump, as they warm up, they will start to rise, reflecting the rich cold start A/F ratio programmed into the PCM.

Post the log in .csv format if you can.... my laptop with DataMasyter crashed, and they have suspended downloads pending resolution of Windows 7 problems.

Camaro350z28

ok i had it posted up what i put up here but you have to signup someone said, do you know of a site i can post it on where you dont have to signup?

i keep looking and cant find a site i will keep searching

Camaro350z28

that was easy, just used my brain and searched here to see where other people do it.. haha sorry sometimes i feel slow. here ya go appreciate it!

http://www.mediafire.com/file/mnywny...onlinehelp.csv

Camaro350z28

to throw more on the top, noticed today if i keep it revv'd around 2k maybe even less the headers glow pretty red

Guest47904

Doesn't need to be hard. They either cycle or not. Then look at what the trims are doing at the same time.


Also I have a question concerning where you soldered the wires. NEVER solder wires between the O2 and it's connector. You can solder the wires on the PCM side of the connector. If you mess with the wires on the O2 side of the connector, it will distort the readings the O2 gets.

Injuneer

When revved to 2,000rpm under load, or under no load?

The log export has too many critical fields of data missing:
-MPH
-coolant temp
-knock retard
-CCP duty cycle
-EGR duty cycle
-ignition volts
-barometer
-run time

It has things that are redundant.... you don't need both the fuel trim absolute numbers (e.g. "124") and the correction percents (e.g. "-3.1%"). One is mathematically derived from the other. I prefer only the trim absolute numbers. That gets rid of 4 columns of data.

Here's the list of what I recommend be in the log:

Record# (inserted automatically)
TimeStamp (inserted automatically)
1 – Runtime
2 – RPM
3 – Speed
4 – TPS Volts
5 – TPS %
6 – MAP
7 – Cool Temp
8 – IA Temp
9 – Ign Volts
10 – IAC Pos
11 –AFGS
12 – Spark Advance
13 – Spark Retard
14 – Knock Count
15 – Inj BPW Left
16 – Inj BPW Right
17 – Fuel Trim Cell
18 – Left O2 mV
19 – Right O2 mV
20 – LTerm-LC (counts)
21 – LTerm-RC (counts)
22 – STerm-LC (counts)
23 – STerm-RC (counts)
24 – CCP DC
25 – EGR DC
26 – Baro
27 – IAC Tgt
28 – Idle RPM
29 – Inj DC Left
30 – Inj DC Right
31 – <OFF>
32 – <OFF>

Camaro350z28

ok, i will take it for a drive today, make a full log of and make sure i get all of that in it and repost one up. i wasnt sure what to put in there sorry bout that.

also speedy, the stuff that was burned was on the PCM side of the harness, i rewired that side with some soldering, but the o2 and til it plugs in is all fine.