I hva been chasing down a gremlin in my truck the past few weeks or so...
There seems to be a lack of power and i found some info that i need clarification on.
Along with the low power there is also a "knock" or a stumble. Hard to explain. It is not quite as bad as when my #2 Inj just died. But it is there and it feels like my truck just doesnt have the oomph it used to esp when towing my dump trailer.
Anyways, so i read that if you hear noise (kinda like a grinding) around the fuel filter housing, it may be your o rings on the IPR leaking/sucking air. Is this correct?
I dont see any evidence of oil leaking or anything leaking from the IPR but i figured it could be problem?
Also i hooked up my AE and drove around for a long time to see if any of the live data will show me anything.
My numbers area as follows
Idle:
ICP PSI - Pretty steady at 475-480
ICP Volts - 0.7-.83
ICP Duty Cycle: 12.5

1500RPM while driving around
ICP PSI - 980
ICP Volts - 1.41
ICP Duty Cycle - 20.7

WOT (Driving around - 3300 rpm wanted to floor it)
ICP PSI - 2492
ICP Volts- 3.32
ICP Duty Cycle - 33.6
Do these #s look about right?
Thanks for the help

 

Piet, those look about right to me but I have no idea what your peak ICP # is. It ought to be higher and then it falls off as the HPOP cannot keep up. About 2500 is not bad on a stock unit at WOT. Is there a chip or tuner? You may want to datalog a full on acceleration on the interstate. Just roll into it without setting off downshift from OD and push it to the floor. You should see a higher ICP peak. This will likely tell you the HPOP cannot keep up.

Having said that, I doubt that the IPR is your problem. You may have a boost leak or something. What kind of boost are you seeing? Log that as well.

I have never heard of the grinding noise at the IPR. I am pretty sure that unit is magnetically activated. If there is a grinding sound, the closest thing I can think of near that is the cam, aside from the gearing in the HPOP. Again, aside from the gearing in the HPOP.

 

No chip, No tuner
Also no boost gauge -
And im pretty sure that my PCM does not have a PID for boost - I will check it in the morning tho. I know that my PCm does not support some of the PIDs available on AE -like cyl rotational cahnge values - my PCM does not have these - I have a very early PCM and i am actually looking for a later model one now with a better code like the PTM 1 or 3
Anyways I will log my comute to the shop in the morning again to see if i can get any higher values and alos see if i can see boost values.
Thank you,

 

You can log what the PCM is seeing if you can log anything. Look for the MAP or manifold absolute pressure reading. The truck will not fuel without that reading. It will be the boost the PCM is using to send the fueling signal. It is seeing something IOT signal fuel to the tune of some 2490 something ICP at wide open throttle. Good luck..

 

Good to know...
I know that i can record MAP
Will do and post results tomorrow