Attention: TDR Forum Junkies SPA DG111 reading lower than usual today.
Truck is '01. 5 ETH/DEE w/True Torque module, a southbend clutch, a SPA DG111 boost/egt gauge and removed the air snorkel from the OEM box. Roughly 42K on clock. Well maintained by owner and has had 3 liftpumps put in under warranty.
This morning I noticed my boost at idle, normally 0 to -1psi was now -2psi (AT COLD STARTUP).
I drove the truck for a while before getting to a stoplight where I could shut the engine off and zero'd/recalibrate the gauge's baseline PSI. Once done the idle PSI seemed to however around a more normal -1 psi. However, in what limited room I had in morning traffic, it seemed a little down on power and slow to spool up. EGT's seems par for speed and RPM I am used to seeing, maybe LOW if anything. No abnormal sounds like loosing boost pressure through a connector or anything.
Upon getting to the office I felt no airleak around my PSI sensor, and the fueling box was fairly warm to the touch.
Here's what I'm planning to do tonight:
1. remove air inlet hose to turbo and make sure the impeller spins freely and no contact with the housing has occured or that bearing is seizing up. (airfilter is stock not reading any restriction on filter minder, has roughly 7000 miles on it) (replace with HX40 if DOA)
2. Check exhaust manifold for cracks. (replace with ATS 3 piece is DOA)
3. Remove boost sensor/fitting, reseal thread sealer and clean electrical contacts/connections.
4. check all pressurized fittings in the intake tract for seal and tightness.
5. check lift pump pressure. (moan and groan if 4th lift pump is dead/dying)
6. reset gauge baseline again and testdrive.
What do you think of my plan of attack? Leaving anything out.
MaX
Ps. Fuel is beleaved to be good, from an ExxonMobil truckstop I regularly fill at.
Truck is '01. 5 ETH/DEE w/True Torque module, a southbend clutch, a SPA DG111 boost/egt gauge and removed the air snorkel from the OEM box. Roughly 42K on clock. Well maintained by owner and has had 3 liftpumps put in under warranty.
This morning I noticed my boost at idle, normally 0 to -1psi was now -2psi (AT COLD STARTUP).
I drove the truck for a while before getting to a stoplight where I could shut the engine off and zero'd/recalibrate the gauge's baseline PSI. Once done the idle PSI seemed to however around a more normal -1 psi. However, in what limited room I had in morning traffic, it seemed a little down on power and slow to spool up. EGT's seems par for speed and RPM I am used to seeing, maybe LOW if anything. No abnormal sounds like loosing boost pressure through a connector or anything.
Upon getting to the office I felt no airleak around my PSI sensor, and the fueling box was fairly warm to the touch.
Here's what I'm planning to do tonight:
1. remove air inlet hose to turbo and make sure the impeller spins freely and no contact with the housing has occured or that bearing is seizing up. (airfilter is stock not reading any restriction on filter minder, has roughly 7000 miles on it) (replace with HX40 if DOA)
2. Check exhaust manifold for cracks. (replace with ATS 3 piece is DOA)
3. Remove boost sensor/fitting, reseal thread sealer and clean electrical contacts/connections.
4. check all pressurized fittings in the intake tract for seal and tightness.
5. check lift pump pressure. (moan and groan if 4th lift pump is dead/dying)
6. reset gauge baseline again and testdrive.
What do you think of my plan of attack? Leaving anything out.
MaX
Ps. Fuel is beleaved to be good, from an ExxonMobil truckstop I regularly fill at.
. 
