Hi Everyone. I think i've figured out a swoosh noise problem I just developed but I just wanted to run it by you guys just in case my head is not straight.

We took a road trip pulling our 2500lb trailer this past week and as we were climbing a grade a loud swooosh sound came on. It is definitely throttle related and comes on as you would expect boost to come up. Its loudest about 2000 rpm's and up. when I back off the throttle or am below 1500 rpm it goes away. Otherwise its constant and does not go in and out if the throttle is steady. Also, I did not notice any loss in power. In fact one issue that I've been having is that I get a slight and random bucking or surging and now it seems to be gone or has diminished to where I can feel it anymore.

So I've looked at all my CAC boots and they look good. I also just checked the tightness on them in the last 300-400 miles or so. I cant see any exhuast leak soot so I think im good there.

Today I disconnected the pigtail to my turbo VGT solenoid (I think It was the little plug that goes to turbo on the top facing passenger side). Once I did this it lost all power but the noise was gone!

Also, a couple weeks ago i borrowed my buddies scan tool and the VGTDC did hang around 80% at times but seemed to move off that number pretty quickly once of idle.

So Im thinking that maybe that sensor is bad and the reason the bucking has stopped also is because maybe that sensor was acting up. What do you guys think?

Another thought I had was that the vanes in the turbo are sticking. I've read that if I see 85% then thats a good indicator but I wasnt sure if 80% was close enough to be a problem also. My plan was to clean the turbo soon but now Im wondering if sticky vanes could eventually kill the VGT solenoid. Is that possible?

If any of you guys have some input or experience on this I would greatly appreciate your feedback!

Thanks, -Jeff

 

.....is it the fan?

Or am I not understanding what a "swoosh" is?

 

the VGT is controlled by a few other sensor plus it has no Vref for quality of itself


its a Gamble to replace VGT not knowing the controlling sensor values but its your money


the truck needs to run diagnostic test correctly with digital numbers


for the price you spend on a VGT if it don't work you could have bought a Gauge you would be stuck at that point if the VGT don't work cause you will need a gauge regardless


they have cheap ones


you may have DTC did the scanner show

 

Yah the swoosh noise is not the fan. But it does sound like air moving. I tried to find some threads using different terms and the only ones that matched to what I'm hearing all used the "swoosh" term so I went with it

 

No codes when I checked it but then again it wasnt making the noise its making now. I will check again.

You have any suggestions on a scanner that will read all the info? Probably best to just get my own so I can fiddle around whenever I want.

Thanks

 

I believe your posting a Noise from a Stuck unison ring problem


Your symtoms match a lot of threads when High RPM with load such as pulling a Trailer getting a swoosh or cha cha cha sound commonly known as a turbo fart


Your turbo needs cleaned would be the most common fix but we totally going on sound description for diagnose Digital confirmation should be achieved

 

Search turbo fart find a video see if it the same

 

I had already looked into that. The problem Im having is a constant swoosh shoosh noise under load. From what I've seen with turbo farts is when you back off throttle quickly.

 

not to say its not the ring it just doesnt fart when I let off the throttle

 

I would pull and clean the turbo first then reevaluate the situation. If it hasn't been done in a while it might be time to do it anyway.

 

I know what I want but don't know how to say it Im talking sound not operating condition if that makes sense
they all can be forced to fart upon quick accelerator lift at WOT


so back to Digital gauge You will be looking at Boost PSI when its making the sound over 28-30psi we dig deeper

 

Yah I definitely think a good cleaning is in order. Certainly cant hurt and will take one thing off the list

 

Gotcha! I will get a gauge on this thing and get new numbers. One thing I do know is that it never made over 25 lbs of boost when I had the gauge on it last time. Dont know if thats telling you anything. Here's all the info I gathered the last time I had a gauge on it. Maybe theres something here you see? This was about 3 weeks ago

Idle in Park:
Bar Pressure 3.39V, 14.6 PSI
EBP 1.15V, 17.2PSI
EGR Position .84V, Actual 0%
FICM Voltage In: 12.49V (got new alternator today)
FICM_MPWR 48.49V
Fuel Pulse Width: 1.3MS
ICP .86V, 580 PSI
Timing -4
IPR 24%
Engine Load 34.9%
MAF 1.47, .08lb/s
MAP 15PSI, 1.37V
VPWR 12.68V
VREF 5V
PIP State: High
VGTDC: 80%

Boost light throttle: 4.5 PSI, Full Throttle 2nd & 3rd Gear max RPM 25 PSI
EBP Full Throttle: 48 PSI
ICP In gear Idle: .94V, 638 PSI
ICP Full Throttle: 4.2V, 3950 PSI

Thanks!!!!

 

Was that truck at temp when you took those

Post ebp BARO map at KOEO

 

Was the truck having the issue when you took those numbers

They show good

Must check when drivability issue is present
BARO
Map
Boost
Ebp