It happens at lower speeds (mph) but at almost all RPM.... i can hear the vanes open, shut, open, shut. This only happens when I run a tune other than my stock tune with the DPF shut off. The pulsing happens on the highway with cruise control on at 65mph/~1600rpm but its not as noticeable. I can only tell from the faint whistle I can hear from the turbo. Do I have a tuning problem or is there something weird going on? This never happened before when I ran a tune from what I can remember. This seems to be a new occasion linked with the newest (2.22) version of the tuning suite. All of my tune files are small, the current one I'm having problems with is kind of a 20-20 tune from mcrats tutorial. I've driven it about 60-70 miles and still has the pulsing. If someone wants to look at the tune file I'll email/post it. I'm new at tuning so I could be just missing something. Thanks!


-David

i wish i could help i havn't done anything with the vvt yet but it def sound like something happend with the software update if it was a turbo or leak issue it would not go away with the stock tune loaded. bet of luck to ya .:)

were any changes made to the vane position tables? It sounds like the desired boost tables and/or vane position tables have been altered and no longer match up well. In other words, you've requested more/less boost in a certain area and the vane position table is off enough that it's hunting around trying to get you where the boost table wants it to be.

I would compare your current tune with the stock one, paying attention to the vane position and desired boost tables and see if you can see what's happening. Logging will also help in this area, you'll be able to see if it's swingly wildly back and forth, and in what area so you can correct it. Also make sure the vane min or max isn't beyond the limits set in the tune.

Jody

I would compare your current tune with the stock one, paying attention to the vane position and desired boost tables and see if you can see what's happening. Logging will also help in this area, you'll be able to see if it's swingly wildly back and forth, and in what area so you can correct it. Also make sure the vane min or max isn't beyond the limits set in the tune.

Jody

I'm with Jody here, go to a tune that didn't do it in a previous version of our software to see if it does it now. Nothings changed in the write procedure so its doubtful its a software version issue, more than likely its whatever you've changed in the file thats causing the issue.

Even if you were to post the files it would help.

were any changes made to the vane position tables? It sounds like the desired boost tables and/or vane position tables have been altered and no longer match up well.


This was my first thought....so I drove home last night and logged the surging... then I pulled over and flashed back to stock... and guess what it's still there just not as much. I can't find a vane position PID in my current HPT scanning setup so I'm going to try a method used by a member on the HPT board to see if I can't find it. I would post a screen shot of the log but I just found out that I only saved a config file and not a log. I'll be back in a bit with some pretty colors! Thanks in advance guys.

-David

I'm with Jody here, go to a tune that didn't do it in a previous version of our software to see if it does it now. Nothings changed in the write procedure so its doubtful its a software version issue, more than likely its whatever you've changed in the file thats causing the issue.

Even if you were to post the files it would help.

I also tried this.... I'm gonna go grab some logs and I'll be back to post up the results... Thanks again!

-David

This was my first thought....so I drove home last night and logged the surging... then I pulled over and flashed back to stock... and guess what it's still there just not as much. I can't find a vane position PID in my current HPT scanning setup so I'm going to try a method used by a member on the HPT board to see if I can't find it. I would post a screen shot of the log but I just found out that I only saved a config file and not a log. I'll be back in a bit with some pretty colors! Thanks in advance guys.

-David

If you think its a software version thing load 2.2.0 & load that same stock file to see if it still exhibits the same symptoms.

Here's a word doc of the log shots with an explanation. I'm also posting my tune file and the entire log file. Bill, I didn't think about using an older VCM suite. I can try that and see if it helps.

My truck is a luck member of the leaky EGR cooler club. I'm beginning to think it might be related to this problem and have nothing to do with software. My dealer ordered the parts for the cooler and I'm just waiting for them to come in (2 weeks now...). They had another truck loose coolant and they didn't find anything until the third time the guy brought the truck back and it would barely run because there was so much coolant getting in. I could be wrong but if the log makes any sens or I need to add a different PID please let me know. Thanks again for all of your help!

-David

after looking at your log file , there werent many pids to veiw but i did notice your g/ycl tabel seemed to be a little fluttery i could not vew the map to compare but just a thought ,have you checked your boost gage for the same flutter, ( maybe boost leak or like stated egr )just a hint run more pids it will help with diagnostics, i couldnt vew most of the pids there was no data but the pids showed ?

I don't have gauges :eek: There aren't many PID's that I have a choice of in the scan tool. There was a boost in the user defined area but I don't know if it's a sensor or if I need something else to read it. I'm sure the boost is fluttering though, I can hear the turbo whistle and stop, whistle and stop, whistle and stop. Sometimes when I go to accelerate from a cruise speed the truck kind of hickups and then goes. Thanks again!

-David

when i looked at your pids i could not see any of your fuel pids ( pulse width or any others that were on the screen i could see the gauge just not working same with the graft screen , you will have to get with hp tech guys and get it working my pids have always worked and i run alot at the same time ( as many as i cag squeeze on that screen :D ) wuithout logging it gets really hard to know what you need to change or ajust on your tune, whethter your having problerms or just want to go bigger :D when i get home tonight i can post you one of my logs to see what is suposed to look like if you would like, best of luck to you

trent

one more thing i had a tow tune i wrote a while ago and while towing i had a flutter in my boost around 20 psi part throttle and i dont even have turbo control, it was the fueling table it was some thing in the pulse width , i changed the table and it was solved so keep that in mind :)

when i looked at your pids i could not see any of your fuel pids ( pulse width or any others that were on the screen i could see the gauge just not working same with the graft screen , you will have to get with hp tech guys and get it working my pids have always worked and i run alot at the same time ( as many as i cag squeeze on that screen :D ) wuithout logging it gets really hard to know what you need to change or ajust on your tune, whethter your having problerms or just want to go bigger :D when i get home tonight i can post you one of my logs to see what is suposed to look like if you would like, best of luck to you

trent

A major part of the problem is that he's using a config that was originally intended for 02 Camaros & Firebirds, not an 06 or 07 LBZ. ie he's trying to log fuel trims & such which simply aren't applicable when it comes to diesels.

With that said I would love to see you offer up some of your configs in our config repository http://www.hptuners.com/forum/showthread.php?t=10251
Thanks,
Bill

A major part of the problem is that he's using a config that was originally intended for 02 Camaros & Firebirds, not an 06 or 07 LBZ. ie he's trying to log fuel trims & such which simply aren't applicable when it comes to diesels.

With that said I would love to see you offer up some of your configs in our config repository http://www.hptuners.com/forum/showthread.php?t=10251
Thanks,
Bill

shure thing i only have one config and it has worked so good i havnt needed another:)

one more thing i had a tow tune i wrote a while ago and while towing i had a flutter in my boost around 20 psi part throttle and i dont even have turbo control, it was the fueling table it was some thing in the pulse width , i changed the table and it was solved so keep that in mind :)


I would hope the fueling table on the stock tune would be ok though :D I'm having the same issue with the stock tune so now I'm starting to think more and more that it might be related to the EGR cooler... I'll try to get a better config and log whats going on. I'm a novice to this tuning/scanning thing so I'm trying to learn as much as I can. Thanks again for everyones help. I'll try to get a better log and post it to see whats going on. Thanks again!

-David

Yeah there is a big difference in the PID's necessary for 07's as compared to 01' duramax, the TPS pid has changed however you should have a ton of different PID's you'll be able to add to the table display including fuel pressure, injector timing, balance rates, etc.

here are the pids i'm using the log shown is my tow tune .

it wont let me atach the file but i will post it on the hp tuners stie were bill specified http://www.hptuners.com/forum/showthread.php?t=10251

Thanks Trentnell!

Ok.... got a new log going... I used the config file trentnell posted to see if I got any better results. I tried to setup my own but I don't seem to understand the concepts or something. So here is a log file thats about 20 minutes of driving. There's cruise speed around 60-65 mph... steady 40-45 mph on the street and then I did a high speed run to see what the log shows at WOT. Hope this sheds some light on my pulsing problem. Thanks again guys!

-David

Ok so I figured it out... not a "software" error... nothing physically broken on the truck... When I got the new VCM 2.22 I saw the EGR box and decided to disable it, however I don't have my blocker plate installed yet. So I enabled the EGR and flashed the truck with the new tune and magically the pulsing stopped. I'm assuming the EGR was getting blown open and that was causing the problem. Before I figured this out I could hold the engine at about 1600 RPM in N or Park and the engine would pulse. Now the truck has been up and going for about 3 days and everything is fine. Just thought I would give everybody an update, and also thank everybody for your willingness to help me figure this out! :D The plus side is I have a new tune I made to post in the repository that I've been seing great MPG gains with. It's based off of the 20-20 instructions on the duramaxdiesels forum. Thanks again guys!

congrats at least it was an easy fix :D

You're telling me! :D thanks

You're telling me! :D thanks
Congrats man... You are getting this..

Kinda scary... If I keep up I'm gonna need a built trans!

Since were on the subject i would like to know what is the best way to adjust the vanes if any. It looks as though the smaller the pitch the boost increases? What are the benefits and downfalls. Basically i am trying to increase boost. I am told i cannot go over 39 psi not sure why but willing to listen if someone can explain to me the intermediate in 08 boost and turbo control. i have figured boost increases with kpa however it apparently doesnt care what i program it wont give me more than 32psi so i am thinking the turbo vanes must have part to do with boost control. Looking for insight i can figure the rest out on my own. thanks!

Make sure you are upping the max boost table under engine tq management.

Mine started doing the same thing....have to wait another week to get the blocker plate...

I found the same thing on my truck when using the "disable" EGR feature in HP tuners. The truck was pulsing wildly. You could hear the turbo through the exhaust pulsating. I then went back and enabled EGR and set the three parameters to where the valve should not come open. This seems to be working so far. I did have to disable one egr code that came up almost instantly. Much less smoke when tipping into the throttle after the torque converter locks.