GaryDoug

You can use freescan, but that is not my first choice ;-) I recommend my app, Scan9495, found in a link here: https://www.camaroz28.com/forums/com...95-lt1-874306/

It is free also and easier to use with more data logged.

Gtpguy

No ****!?! Ok I'll get that going and see if I can get a log to you in the next day or two. Thanks man.

Gtpguy

Did a couple scans. Last one was 19-109mph. Absolutely zero knock, but knock counts were around 30k by the time I was done. Gary, how would you like me to get these logs to you?

GaryDoug

See post 27

Gtpguy

Email sent

GaryDoug

http://www.mediafire.com/view/2p8r2f...P7R2202321.csv

Injuneer

Took out 4 lines of seemingly corrupt data (total scan time = 15:53.47, 15:55.29, 15:55.38, 15:56.36). In closed loop, "ignition volts" range from 11.4V to 13.2V with and average of 12.7V. The readings below 12.0V seem to be single cells of data, several of them in the lines of corrupt data <- GARY * * * * * **

GaryDoug

The bad data at those 4 points could just be PCM glitches. I do see one line of really bogus data at 15:56:06; we can delete that line for sure. Not sure about the others. Could be an intermittent electrical connection somewhere.

What is the original problem that prompted you to check the codes? You said "But it didn't throw a code until now". How did that appear, in a lit SES lamp? If not, I think we can dismiss the codes entirely for now.

What all has been changed in the pcm? I see the fan first turn-on temp is about 180 degrees, a non-standard value.

Gtpguy

It threw a code, turned out to be 23 and 32, but I thought it was for the alternator/idle low voltage issue initially. We know the rest.

What did you think about the maf readings? I cleaned it and it fixed the performance problem. I need a new filter, the kn is old, beaten up and bleeds the kn oil all over the maf, No matter how little I spray on it.

Injuneer

I had a typo in my last time stamp, it was .06, not .36 I removed that line of data.... the 55 RPM was a dead give-away

MAF looks OK at 550 RPM idle.

MAP is high (= low vacuum) at 550 RPM idle, with MAP at about 41kPa. I would expect something closer to 35 kPa with a stock cam.

MAF at peak reading of 5,682 RPM (unfiltered) seems a shade low at 220.65 GPS. But you are also starting with a slightly low barometric pressure reading (what is the elevation where you are located?), and bit more pressure loss that I usually see, as evidenced by the 93.01 kPa reading with that RPM/mass air flow. The lower the MAP, the lower the mass air flow. Probably just a reault of the low barometric pressure, which is a function of elevation and weather conditions.

Gtpguy

Gilbert as, 1200ft Elevation. I cleaned the maf and the power all came back. It needs plugs bad. So I will do another scan this weekend and give it to you guys again.

So if I understand you, the maf should read higher now that it's cleaned, and that would raise the map?

Injuneer

MAF should read higher, and that should bring down the long term fuel corrections, which are all elevated above 128.

The K&N filter should not be cleaned frequently. That's what destroys it. Actually works better when it's a bit dirty. K&N recommended cleaning interval for normal driving conditions is 50,000 miles. It is guaranteed for 1,000,000 miles, but it can only be cleaned 20 times (20 x 50,000 = 1,000,000).

Gtpguy

Gary, I just sent you a scan I just did. Its feeling strong, but I know its running lean. Let me know what you think when you got some time. Thanks

GaryDoug

http://www.mediafire.com/view/opecg9...P7R2202321.csv

Gtpguy

I can't go to the site, it's always "temporarily down". But I can read an area on the scan you think is important. Do I have a vaccuum leak causing the lean condition? What about a BLM locker? My bro says that it will help and a friend with an lt1 liked the locker in his car.