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Old 01-27-2014, 02:58 PM
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Boost is all over the place

ok so about a month ago i was driving with the cruse control set at 70mph and i noticed every now and then my truck seemed to cut in and out of power. It only happened once so i ignored it. about two weeks after that i got the edge cts monitor and noticed that it happened again, and as it happened i watched the monitor and the boost seemed to jump from 11psi to 18-19 psi then back down then back up. so i am just trying to figure out what is going on with the turbo. no engine coded from the turbo jumping but i am getting a generator circuit code as well as a egr position fault code. Are the codes related to my turbo problem? thanks for the help
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Old 01-27-2014, 06:42 PM
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they could be related. With all the electronics on this engine, a faulty eletrical circut (generator) could cause all sorts of problems.

Wish I had more info for you.
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Old 01-28-2014, 09:08 AM
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update: So i called a diesel shop and he said it could either be a bad sensor in the turbo. Don't know what the sensor is called???? or the unison ring can be sticking. what do u guys think i should look at first? is there a way to test the sensor on the turbo?
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Old 01-28-2014, 03:00 PM
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i don't know what sensor they would be talking about. There is a solenoid, but it has no feedback, so i wouldn't call it a sensor. That solenoid could go bad, but honestly I have not seen anyone that had a confirmed VGT solenoid go bad. I thought mine was bad after a lot of troubleshooting, but it turns out that it was a short in the two wired that go to the solenoid. They were rubbed raw WAAYYYYYY down in the protective tubing that goes around them. I was at my wits end when i decided to follow the wires all the way to the ECM if I had to. I wiggled those wires around while the truck was running and I finally got the turbo to change sounds like it had been disconnected, confirming that the wires were in the problem. Little liquid tape and some actualy tape and it was fixed.
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