Vgt gone wrong

97BambiBasherPSD · Oct 29, 2013

So today my vgt started messing up on me. It sounds like a cummins truck tone wise with no whistle at all. Then you get going the turbo spools up but it spool up way too fast. Like I'm getting 2psi at idle. It's max is 27psi for me but when it acts up it will hit 33psi without full throttle. The vgt duty cycle is all over the place. When you let off the throttle it sounds like it's howling outta the stacks. Then it might start running right but then goes right back to messin up. Idk if it's the solenoid or the connector since I noticed the connector is broken. Also iv read the ebp sensor will do it too. Idk I'm lost. Where do I start? Thanks!

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rentstdi · Oct 30, 2013

Vanes sticking?

97BambiBasherPSD · Oct 30, 2013

They were just cleaned 2 weeks ago. Iv only put 500 miles tops on it

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Idiesel · Oct 30, 2013

Sounds like maybe the solenoid is going bad. Idk if that's a common problem. I've seen it happen on a few dmaxs

ghohouston · Oct 30, 2013

The solenoids do go bad time to time. They usually make a real bad "slapping" sound

97BambiBasherPSD · Oct 30, 2013

it did this to me once but i shut the truck off and restarted it and it was fine until yesterday when it started acting up again. that was saturday when it happened first.

97BambiBasherPSD · Oct 30, 2013

Ok changed the solenoid plug and now I have no boost. I unplugged it and no change whatsoever. Idk if it's the solenoid or not. Help!!

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Idiesel · Oct 30, 2013

Sounds like you didn't make good connection when you changed the plug or the solenoid took a crap completely.

78f100 · Oct 30, 2013

your not ever gonna get a good answer with that avatar, I cant remember the question...LOL

weazel · Oct 30, 2013

My EBP sensor took a poop and did exactly what you said, but it threw a code. But my VGT solenoid crapped out and it did it too,

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97BambiBasherPSD · Oct 31, 2013

I'll grab an ohm meter at work and see if it's working right. I should be able to set my SCT to read back pressure. That should tell me if my ebp sensor is working right?

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97BambiBasherPSD · Oct 31, 2013

Btw when I changed the plug I pulled outta the driveway and it didn't spool up then it went to 15psi and hasn't worked since

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97BambiBasherPSD · Oct 31, 2013

When I went to work this morning BP was reading 21.48psi all the time except doin 70 and it would fluctuate to like 30psi and that's it. Still no boost. Key on engine off it was still reading 21.48psi. Shouldn't it be reading 0?

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97BambiBasherPSD · Oct 31, 2013

I checked the ebp tube and it's clean and clear. Checked the ebp sensor and it's clean. I tried another vgt solenoid and that didn't do anything. I am so stumped!! Help me

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ghohouston · Oct 31, 2013

97BambiBasherPSD said:
When I went to work this morning BP was reading 21.48psi all the time except doin 70 and it would fluctuate to like 30psi and that's it. Still no boost. Key on engine off it was still reading 21.48psi. Shouldn't it be reading 0?

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That doesnt sound right, but im not positive...

weazel · Oct 31, 2013

The sensor can be clean and still be bad.

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97BambiBasherPSD · Oct 31, 2013

What are the signs of the ebp goin bad? What about the vgt solenoid?

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weazel · Oct 31, 2013

The symptoms you are having, it could be either one, or both, I would start on the sensor it is cheaper

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Commandos888 · Nov 1, 2013

Re: Hey bud

Use a scanner check EBP and make sure it about 1.5 p.s.i of the BARO. it 0.15 volt.if it is it's good.In my shop i seen my lead tech and i misdiagnose a turbo due to a faulty MAP sensor.that is one i will NEVER over look again!!! I use a VCM 2 to check pids you could also use a scanner with live data. use a hand held push pull pump,to test the MAP.The MGP should be the same on the vacum gauge.

Commandos888 · Nov 1, 2013

Re: Hey bud

Also with the scanner again check that vgt command if it go's 15% or 85% for more then 4 seconds.If its doing that then the vanes are sticking. and you also checked all the CAC boots and up-pips for leaks???