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I just came across this same issue trying to diagnose a rough idle on my 2012 Sierra Denali (L9H) with E38 ecm. Disabling the injector with the scanner did not match the cylinder reporting the...

From what I have been told, it is something glitchy with the early 411 truck OS's. I have the same problem on my 01 Tahoe but the fans work perfectly in my 00 Silverado with an 02 pcm swap. I...

Thanks Bill, I will just disable the code then.

After a H/C swap on my brother's 99 Corvette, it idles 78-82 KPa and is throwing a P0106 code. However, when I go to Engine Diagnostics > Airflow there are no MAP tables, only MAF and IAT. OS is...

Sorry, someone else sent me a large attachment over the weekend. Mailbox is clean and awaiting your response. Thanks Bill. :cheers:

I sent Bill an email so hopefully this issue will get some attention.




see attached .bin... thanks.

Just wondering if there has been any development on uncovering parameters that will allow us to keep the TCC locked during low TPS on a 4L80? I did a search and didn't see anyting recent.

Bump for solution... I just installed fans on my 01 Tahoe last night and am having the same issue.

Bumping this up to see if there was a solution....

I just installed fans on my 01 Tahoe last night using a single speed relay configuration using blue-42 as ground trigger. With engine on (cold)...

Assuming you have a CAI and the MAF is slightly relocated, check to make sure the plug is snapped in securely and that the wires are not pulled tight on a body panel chaffing the insulation.

TTT for clarification... Does the beta release address the pin#33 reassignment in the 99-02 pcm's? If not, do the new A/C controls operate fan1 (pin#42) for a single speed fan setup triggered by...

Just to add some insite to this topic, I too have been concerned with the IAT readings I am getting with my KB 2.8H. With a stock truck crank (7.5") and 3.5" blower pulley I see mid 140 - low 150*...

In 4th gear, converter locked, I am seeing trans input rpm equaling output rpm which is greater than engine rpm. How can this be? Or is it a glitch in the scanner or pcm data? Has anyone else...

I have been having some slipping with my 4L80 so I ran a scan to determine if it is the trans, converter or both. Once I started analyzing the scan, I saw a few things that bewildered me such as the...

Well, it is not VATS. :(
For grins, I tried to crank it with the 'mod3' tune left in from last night. It stayed running on the second crank. Let it idle to operating temp to scan afr ('_1"...

Sorry, I ment VATS-relearn, not crank relearn. I was going to try the whole 30 min procedure but if I can just disable it, I will try that.

Would a crank re-learn be necessary after a write entire? That is almost how the truck is acting like when I put in the '02 PCM before doing the re-learn. It fires easily, acts like it wants to run...

Do you mind sharing what worked for you? It seems mine is doing the exact same thing after going to 2bar OLSD.
http://www.hptuners.com/forum/showthread.php?t=20403

I was really hoping that was it but I changed the 3 maf dtc's from 2-no mil to 0-mil on first error with SES enabled checked. MAF fail set to 0 and maf is completely removed from the truck. ...

Just got the truck put back together last night and loaded the 2bar SD OS. It hesitantly started and idled in the driveway while I scaned some idle paramenters. I got idle afr pretty close to...

Check out my thread a few threads down and dl the file. You may want to check your Trans Output speed to make sure everything is jiving. After changing that mine shifts great now.

You're the man Bill! 1-2 shift is awesome now. Could not test the 2-3 due to low speed limits and tourist traffic. My converter locks up where is should now too. I made a custom pid to log the...

After getting home and looking at my file, I can see exactly what you are talking about. Low and behold, it was right there in the help file too. :o I did some reverse calculations and came up with...

My speedo was dead on with my gps before the trans swap based on rolling diameter of the rear tires and rear gear. Those are the only two variables in the equation other than trans output shaft rpm....

That makes sense as to why it is not shifting but why the discrepency in the speed? I presume the entire shift speed table is based on this calculated trans rpm as well? How about TCC tables? That...