Hello, I'm new to this site and could use some serious help to find out what is ailing my 6.5 turbo with 182000 miles. Problem began with a wondering throttle and now has turned sour as with a cold start the engine increases rpm's to 2000's by itself when idle. Engine starts quickly everytime and has never stalled. The pedal does not move just the rpm's increase. Returns back to 600 rpm's if I put it is gear (I know this is not recommended). When it finally settles down the idle is rough and wonders 100 to 200 rpms and sometimes increases to 1100 rpm's. On acceleration or when going up hills black smoke pours out the exhaust and continues to surge.

Vacuum pump is strong but I have no way of checking the waste gate solenoid.

Would appreciate any suggestions on where to begin looking for this problem.

 

The PMD is bad it is not the waste gate or waste gate solenoid

 

x2

 

Many thanks for the suggestion of replacing the PMD, it was the first item to consider on on my list. Would appreciate yr suggestion on which PMD you would recommend and should it be black or the new grey one? I'm planning on getting the largest heat sink and bumper mounting the unit.

 

Diesel Care and Performance Inc
I just put one of these in my 94 a couple months ago frome these guys so far no problems with it make sure you get the resistor out of the old one in your truck make sure you get the extension harness from them too as they have free shipping,here is a picture of how I mounted mine I used a piece of angle iron with a notch cut out of the middle for the bend of the bumper make sure you put a ground wire from the heat sink to the body or frame to keep it from burning up before it's time

 

i am an auto mechanic and i have one in the shop thats kicking my butt , this turd had a locked up turbo ,but the reason it came in was over 1200 rpm it would go crazy and overrev, then almost shut off then take back off again. no check light, all three app sensors are smooth

 

Over reving and erratic RPM's is a classic symptom of PMD failure

 

here is a hair puller;2001 6.5 past 1200 rpm the engine goes ape ****,surges to 4000rpm then idle.i have a snap on modis and everything is sweet. no check engine light.the turbo was locked up tighter than my gun vault.

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this is the first time i have ever registered and been on a sight like this ,i feel like a virgin to this territory. thank you for your input.

 

Is the PMD still locayed on the IP??this is the worst location possible for a PMD as a matter of fact anywhere under the hood is a bad location for it

 

Can't tell you how thankful I am for what I'm learning on this site. Obviously new to it. I had a PMD that was changed and relocated to the bumper due to truck not starting one day. Good to go for several months. Other fix intermitting lack of power when passing on trip which require new LP. These obviously fixed problem for some time. Then the other day attempted to start veh. Surging idle, black smoke billowing and no accelator pedal. Alot of shops go right for the IP. Not prepared for this. In comes diesel bombers and options and information became available. IP was the opinions from mechanics. Wasn't satisfied with that answer till I could rule out less costly stuff. Being that I had the PMD already relocated and replaced I thought this would be the last place to look. Not. So glad I did some research. Tonight I just put it in and runs like a top. STOKED. Money in the bank before christmas. Did I say stoked.