Hi guys,

For a few months now I have had various limp mode situations and am at a loss to know why.

To date I have done the following:
New APPS (Timbo)
New transmission governor solenoid and sensor.
Removed and cleaned MPA and IAT sensors - IAT gave reading of 17.46 K ohms at 50 F. I have an auto and no exhaust brake, so the sensors were not very dirty but I cleaned them anyway.
Checked ECT sensor and it gave 27.6 k ohms at 50 F !!!!!
Installed new replacement Raptor fuel pump - now get 19 idle, 15 cruising at 60 mph and 12 when WOT.

I don't think the VP44 is failing yet as the truck starts with no problems, does not smoke when driven (to my knowledge) - exhaust looks clear in rear view mirror. When the truck is driven it drives just fine and when I get the lip mode it is intermittent and usually returns back to normal. Even when in limp mode I have not seen any sign of smoke in the exhaust.

Of course I am hoping the VP is still good and that my problems are being caused by something else - bad plug connections, grounds, spurious electrical signal etc.

Any and all thoughts would be appreciated. This is starting to become a reliability problem and I am loathe to spend $2,500 on a VP44 and still have the same problems afterwards. The only codes I have had are P0216 and
P0222. P0222 cleared and never came back and I don't get any CEL showing.
I understand the P0216 can be caused by several different faults - any one have a check list for these ?

Thanks in advance.

mariner

 

Mariner,
I am not going to be much help in suggesting the cure to your problems but I can help with on thing. A VP44 is an expensive part to replace on the off chance that it might be your problem. The link below will take you to a page (Bluechip Diesel) with some really good VP44 diagnostic procedures and questions. This should help you narrow down whether your injection pump is your problem.

http://www.bluechipdiesel.com/vp44diagnostichelp.html

 

Thanks for the link to the Blue Chip diagnostic for VP44 pumps.

I am wondering about the waste gate on the turbo ! If this started sticking the signal to the inlet manifold would be compromised and this could in turn give odd ball readings at the MAP sensor.

I guess I should look at the truck and see where the waste gate is situated and if it can be removed for maintenance/cleaning etc. If the waste gate is sticking it could cause some of the problems I am getting - especially the "fleeting" limp mode situation.

Has anyone dealt with the sticking wastegate before and if you did, did it solve your/any problems ???

Again, any info from others that have had similar situations would be greatly appreciated.

mariner