Engine/Transmission (1998.5 - 2002) Does this sound like the APPS or worse

[marshb]

Leaving work the other day the truck fired up with no problems. I idled to the street and pulled into traffic. Lots of white smoke and little or no boost. I pulled to the side and idled to a safe spot. Suddenly after about a block everything was back to normal. FP at 12 lbs boost at about 10, without another hiccup for the 25 miles home. I have had this happen 3 times now. Always in warm weather after the truck has sat in the parking lot for the day and always at low speed.



It seems to take about 1/4 mile to clear with no problems after that.



Truck has 99,000 miles. I have considered the heat affecting the edge EZ or the Banks Break, but so far it hasn't happened when going down the road at hiway speeds.

 

[FourBarR]

have you checked codes. on an 02 you can get them by key ,off three times and not starting the engine . codes will come up in the odometer window. write them down and post them here. could be several things , most likely vp-44 or apps.

 

[FourBarR]

Sorry missed one important thing ,should have said key on,off three times leave on after third time . dont start the engine . Should read what I said before sending.

 

[Joe Mc]

Could the turbo oil drain line to the pan, or the crankcase vent be restricted. White smoke is usually oil in the combustion circuit. However, the little to no boost is a tricky one? Staying with the restricted oil passage/vent theory, if the oil isn't draining from the turbo it could be coking (oil going gummy or solid) up the turbo bearing and not allowing it to turn until the new oil (from oil pump) pushes through allowing turbo to spin normally. I'm just thinking here but I'd look at the drain hose under the turbo to see if it's kinked or if your crankcase vent is clogged. Check the hose part of the drain under the turbo before starting up your truck, then start up and feel for some outward flow at the vent (still have the puke bottle?) tube.

I could be way off here but who knows. I'm sure someone else will chime in soon.

 

[blacksheepdiesel]

Acts like a VP44 going bad to me.

Godspeed,
Trent

 

[JLandry]

Definitely check codes, but a lot of folks experiencing similar symptoms discover in the end it's the VP44 injection pump in early stages of failing. A theory in this situation is that the timing piston inside the VP44 intermittently sticks preventing proper fuel injection advance. This causes all the white smoke (which is unburned fuel - burning oil is blue BTW) because the fuel injection is so late and that results in low power.



Best of luck to you,



John L.

 

[Doughboy21kd]

Just a question. No Hijack intended. just have similar issue. But mine when warm outside, it idles like the injection timing is off but cruising or WOT it runs GREAT. I do notice if i let idle when warm and i step on the throttle in "N" it will sputter a bit and blow blue/white smoke then turn black. What would cause that? I just put brand new APPS on it. It did it before the APPS. I have no codes would this be early signs of VP going out? What else should i look at/for?



Edit: I also would like to add that my mileage isn't that great at the moment.

 

[PRout]

because the fuel injection is so late and that results in low power.

Best of luck to you,

John L.

Just curious if this would show as higher EGT's for the same amount of work also?

 

[JLandry]

Just curious if this would show as higher EGT's for the same amount of work also?

I think so...



If fuel is being injected too late for a given rpm and load, then the air/fuel mixture is still burning when exiting out the exhaust, thus heating the EGT probe more than normal.



Best regards,



John L.

 

[JLandry]

Just ... mine when warm outside, it idles like the injection timing is off but cruising or WOT it runs GREAT... . Edit: I also would like to add that my mileage isn't that great at the moment.

Well first you'd have to eliminate all other causes before focusing in on the expensive VP44. You should verify adequate fuel pressure and flow to the VP44. Replace the fuel and air filter.



Nest you might want to clean and test (or just replace) the IAT (Intake Air Temp) sensor. Possibly the MAP (Manifold Absolute Pressure) sensor should be replaced too. Even the coolant temp sensor could be suspect.



Replace only one sensor at a time and test drive. If the problem isn't solved with a particular sensor replacement, keep the old one as a spare. If none of these helps, then yes... the VP44 would be suspect.



Best regards,



John L.

 

[marshb]

Code are pcu 1693 ECU 0216

Thanks for the assistance so far.

If I read the posts correctly it points to a possibly failing VP44.

I haven't noticed a drop in pressure, but I suspect if it is early in the process

that may not be noticeable yet.



Am I reading this symptom correctly?

 

[blacksheepdiesel]

A dying VP44 is not indicated by low fuel pressure. Typically the VP uses less fuel as it dies which would not pull fuel pressure down.

Godspeed,
Trent

 

[JLandry]

If I read the posts correctly it points to a possibly failing VP44.

Yes... that's the concensus.

I haven't noticed a drop in pressure, but I suspect if it is early in the process that may not be noticeable yet.



Am I reading this symptom correctly?

As Trent indicated, you can have a dying VP44 and you won't necessarily see any change in the fuel pressure. The fuel pressure prior to the VP44 is not controlled by the VP44... the lift pump is responsible for that. However, low fuel pressure from the lift pump can definitely harm the VP44... but this doesn't sound like your situation.



Right now you should probably be shopping for a good refurbished VP44 and brushing up on how to replace it (if you'll be doing it yourself). There are some excellent how-to tutorials and videos here:



Bosch VP44 Replacement



Diesel Dan's VP44 Replacement Videos



Regards,



John L.

 

[KcoleKennyc]

I had this go on for a long time before the VP-44 died. That is most likely the problem. At least mine died in a good place, at home. Always had a fear of breaking down on a long trip.

 

[JLandry]

At least mine died in a good place, at home.

There's nothing better than dying peacefully at home. :-laf