Engine/Transmission (1998.5 - 2002) NO Boost Truck wont get out of it's own way.

[Leathl_WS6]

Hi Guys



Hoping someone can help me out here.



This happened to me about a month ago and lasted for only two days then went away.



I have been driving the truck problem free for the last month.



3 days ago the gremlin cam back.



No power at all. No Boost registering on the gauge. When the the problem came up it just happened. I shut of the truck it was running fine. I started it back up no power or boost at all.



Air cleaner is good and clean. I even took off the air inlet tube and went around the block.



I tried pincihing the air line on the turbo with vise grips, the line I would imagine goes to the BOV. I know on the 12 valves you could pinch this and raise boost. No change at all.



I do have an edge installed with out the injector pump wire tapped. Turning this on or off has no effect either way. Unplugging it also has no effect.



There is a full exhaust installed on the truck and the resinator has been removed.



The turbo does have a little play in the shaft. But it does not seem to be too bad. it spins freely by hand and whisles pretty good just reving it up in the driveway. But under load there is no increase in boost.



Everything else is stock. The truck has 150k on it. It is a 1999 6sp manual 4x4.



Thats all I can think of. Your help is appreciated.



I thnking maybe a BOV, or the Turbo. Seems odd how it just came and went and now its back.



Thanks Rob

 

[PVanderlugt]

fuel=boost, no fuel,no boost, I would see if you have any VP related codes. Those things are fickle, lots of different ways to die.
Also APPS might be a suspect. I would say either not getting fuel because VP is going out OR VP is not getting correct signal (APPS).
SEE if you have any codes, be a good place to start.
Pete

 

[Leathl_WS6]

Thanks Pete!



For the record there are no lights light.



Can a normal scanner from Autozone read codes on this thing if there are any? I will stop by there and see.



I know this doesnt mean a lot but the VP is less than a year old.



I do have plenty of Fuel Pressure before the VP. 15lbs.



What is the APPS?



Thanks



What is the apps?

 

[EBung]

Wastegate could be stuck open. Can you still make smoke?

 

[icman95]

APPS=Accelerator Pedal Position Sensor.



Because these engines are electronically controlled, there is no direct link between the gas pedal and the throttle, like there would be on a carburetor setup. There is a sensor that tells the computer how far down you're pushing the go pedal. The computer then knows how much fuel to send to the engine. If the APPS goes bad, the computer won't know how much fuel to send to the injectors.



Just one other thought. Are all the tubes/hoses that carry the air from the turbo tightly in place? If everything else is working ok, then maybe the turbo is spinning properly, but the air isn't getting to the engine because the hoses are loose. Maybe they even have a hole in them. Inspect carefully and tighten the clamps.

 

[EdK]

Edge could be the problem

The Edge could be the key here. Sounds too simple, but go over EVERY ground connection involving the Edge... including up by the control box. I have experienced the very same problem and "grinding in" the ground connections fixes it.



Ed

 

[SHobbs]

MAP sensor ( boost pressure sensor ). Autozone can read your codes, they have done it on my truck many times for free.

 

[icman95]

Leathl,



Do you have a Smarty programmer or do you know someone with one? It will read your trouble codes for you just like the auto parts stores will. Of course the stores will do it for free, the Smarty you have to pay for if you don't already have one.

 

[Leathl_WS6]

No Smoke at all.

 

[Leathl_WS6]

Thanks Ken



I don't think it's a hose thing but I will check. I would expect to be down on power with a loose hose. But this is to the point where I can't get up a small incline on the highway with out scrubbing off 15 to 20 MPH.



I will check on the APPS sensor that seems like it could be a likely problem.

 

[Leathl_WS6]

Thanks Ed,



I was thingking the same thing on this yesterday so I disconnected it totally and the problem is still there.

 

[Leathl_WS6]

My next move will be going to auto zone and have them read the codes. I am also going to check the fuel filter which does not seem likely because of the here today gone tomorrow problem seems to be more electrical.

 

[blacksheepdiesel]

Have the codes read and cleared. Whether any codes show up the symptom says the VP is on it's way out, maybe early stages. This will continue happening randomly until the VP is replaced, that has been my experience with two different VP's.

Godspeed,
Trent

 

[PC12Driver]

Thanks Ken



I don't think it's a hose thing but I will check. I would expect to be down on power with a loose hose. But this is to the point where I can't get up a small incline on the highway with out scrubbing off 15 to 20 MPH.



I will check on the APPS sensor that seems like it could be a likely problem.

Can you get full rpm with no-load? The APPS directly controls rpm, so if you can get to redline in neutral, the APPS is probably good.



The MAP (boost) sensor was suggested. The engine computer won't add fuel unless there is enough air to match. If the MAP isn't reporting a boost signal (stuck at zero), fuel won't be added as load is increased. It'll just sort of sag along, no smoke, no boost. But, I believe you can unplug the Edge Comp from the MAP sensor but leave it plugged into the truck's MAP harness lead and it will default to a full-boost condition. This should make the truck a smokey mess off idle, but that would point at the MAP being a problem and not the VP44 injection pump.



And of course, change the fuel filter first. You never know, and it's cheap.

 

[TDeltonto]

i had same problem replaced the MAP problem fixed hasnt done it since

 

[Leathl_WS6]

Thanks everyone for all of your suggestions.



I will have codes read today change the fuel filter and replace the map sensor for starters. It should be cheap cheap... .

 

[icman95]

We can't let you off that easily. Please be sure to let us know the end results. Can't leave us hanging!

 

[Leathl_WS6]

Ok here are the codes



P0238

P0237

P0236



All related to boost pressure sensor.



I am guessing that is the MAP they are just refering to it as a boost pressure.



Seems to be a dealer item as auto zone did not carry it and could not get it.



So I'll have ot wait till Monday. Hopefully my dealer has one in stock.

 

[Leathl_WS6]

Ok I replaced teh sensor and the problem did not go away.



How do clear the codes?

Could the problem still exsist because I did not clear the codes?

 

[Bob4x4]

Ok here are the codes



P0238

P0237

P0236



All related to boost pressure sensor.



I am guessing that is the MAP they are just refering to it as a boost pressure.



Seems to be a dealer item as auto zone did not carry it and could not get it.



So I'll have ot wait till Monday. Hopefully my dealer has one in stock.

Those codes will not normally show up together at the same time,unplug your edge at the boost connector and drive it to see what turns up