rooski
Smoke on the water
Hi everyone, new to 6.5Ltd gm. Mine's in a K1500 automatic with EGR.
Here's my (long) first post after reading alot of others....
The Good:
starts beautifully with only a small puff of white (when cold), glow plugs cycle fine, lift pump vibrates and delivers fine (new fuel filter housing top valve will pour out fuel when twisted open and water valve has full flow as well).
Vacuum pump shows 26", waste gate solenoid delivers to turbo up to 15".
Idles smooth as a baby's bottom.
The Bad:
Put it in gear and it starts to run rough. When you try to accelerate it bucks for the first few hundred rpm, then smooths a bit. Will not rev up under load past 1500rpm and will not carry the truck over 45kms/hr. Scanner shows between 80-100% load on engine during acceleration to 45kms. Rattles like a gas job needing a timing adjustment while under the heavy end of the load. If I pull back a bit on the throttle the rattling stops but the truck is still not picking up speed.
Unhook the EGR and it smokes black like a drunken sailor at any response from the throttle while in gear. Otherwise zero smoke with no load unless you pin the throttle then its normal for a diesel.
(With EGR hooked up the smoke is mostly grey instead of the usual black as if it has a ton of unspent fuel going through. Also smells like kerosene when this is done.)
Checked out:
The wastegate opens when vacuum is present and you cannot budge it by hand when activated.
Delete the EGR from vacuum cycle and the wild bucking stops when in gear at stand still, does not buck at all as acceleration is attempted without EGR hooked up. Still will not accelerate and acts like its in limp mode.
No codes present, but history showed P0236 which is the wastegate solenoid. New solenoid two days ago. No change. Looked new anyway but someone had the vac lines on backwards according to the sticker on the fan shroud.
Turbocharger spins freely with no side to side play of any significance. A good finger spin (like spinning a top) at the center shaft and the wheel spins over at least 5-6 revolutions. No lumpiness or grind feeling etc. No excessive oil at mouth of turbo intake air inlet when the hose is removed.
All wire connections have been unplugged and inspected found good, all connections and harnesses have been jostled while engine is running causing zero change, so no broken wires suspected. All grounds have been removed, cleaned and retightened. Batteries are brand new and fully charged with aletrnator charging as it should.
Items of Note:
Just bought the truck with the current problem. Previous owner did nothing but buy a new truck.
The PMD is still pump mounted.
Connections to PCM are solid and clean with good solid mounting for the PCM itself.
Has new fuel filter.
Full tank of fuel (new and clean)
Although the lift pump vibrates and sends a good fuel stream I have only checked with the engine running, not with key on without being started. Possible lift pump issue sucking air? Fittings were loose when I got it home and I cleaned and tightened. I noticed the lift pump makes the same noise all the time. My diesel mowers do not once the pump pressures up the delivery fuel, then they quiet down when they reach their pressure limit. The one on my truck acts like it never reaches its pressure limit so I wonder if it is sucking air somewhere. I think I have eliminated the "bent pickup in tank" threat with having a full tank of fuel (not sure if this is correct but logic tells me so).
Ambient temperature is 65 degrees C. Intake Air temp maxes out at 50 degrees C on scanner after a painfully slow 3 mile drive. Coolant temperature did not exceed 80 degrees C during the drive.
Truck has new air filter and all tubing is clear of obstruction.
Not sure about the catalytic convertor. Plugged ???
Maybe someone can read through all this and point me in a reasonable direction. I am not interested in changing to a mechanical wastegate or anything else that takes away from factory setup, so please no responses of that nature.
Thanks in advance for your help !
:skep:
Here's my (long) first post after reading alot of others....
The Good:
starts beautifully with only a small puff of white (when cold), glow plugs cycle fine, lift pump vibrates and delivers fine (new fuel filter housing top valve will pour out fuel when twisted open and water valve has full flow as well).
Vacuum pump shows 26", waste gate solenoid delivers to turbo up to 15".
Idles smooth as a baby's bottom.
The Bad:
Put it in gear and it starts to run rough. When you try to accelerate it bucks for the first few hundred rpm, then smooths a bit. Will not rev up under load past 1500rpm and will not carry the truck over 45kms/hr. Scanner shows between 80-100% load on engine during acceleration to 45kms. Rattles like a gas job needing a timing adjustment while under the heavy end of the load. If I pull back a bit on the throttle the rattling stops but the truck is still not picking up speed.
Unhook the EGR and it smokes black like a drunken sailor at any response from the throttle while in gear. Otherwise zero smoke with no load unless you pin the throttle then its normal for a diesel.
(With EGR hooked up the smoke is mostly grey instead of the usual black as if it has a ton of unspent fuel going through. Also smells like kerosene when this is done.)
Checked out:
The wastegate opens when vacuum is present and you cannot budge it by hand when activated.
Delete the EGR from vacuum cycle and the wild bucking stops when in gear at stand still, does not buck at all as acceleration is attempted without EGR hooked up. Still will not accelerate and acts like its in limp mode.
No codes present, but history showed P0236 which is the wastegate solenoid. New solenoid two days ago. No change. Looked new anyway but someone had the vac lines on backwards according to the sticker on the fan shroud.
Turbocharger spins freely with no side to side play of any significance. A good finger spin (like spinning a top) at the center shaft and the wheel spins over at least 5-6 revolutions. No lumpiness or grind feeling etc. No excessive oil at mouth of turbo intake air inlet when the hose is removed.
All wire connections have been unplugged and inspected found good, all connections and harnesses have been jostled while engine is running causing zero change, so no broken wires suspected. All grounds have been removed, cleaned and retightened. Batteries are brand new and fully charged with aletrnator charging as it should.
Items of Note:
Just bought the truck with the current problem. Previous owner did nothing but buy a new truck.
The PMD is still pump mounted.
Connections to PCM are solid and clean with good solid mounting for the PCM itself.
Has new fuel filter.
Full tank of fuel (new and clean)
Although the lift pump vibrates and sends a good fuel stream I have only checked with the engine running, not with key on without being started. Possible lift pump issue sucking air? Fittings were loose when I got it home and I cleaned and tightened. I noticed the lift pump makes the same noise all the time. My diesel mowers do not once the pump pressures up the delivery fuel, then they quiet down when they reach their pressure limit. The one on my truck acts like it never reaches its pressure limit so I wonder if it is sucking air somewhere. I think I have eliminated the "bent pickup in tank" threat with having a full tank of fuel (not sure if this is correct but logic tells me so).
Ambient temperature is 65 degrees C. Intake Air temp maxes out at 50 degrees C on scanner after a painfully slow 3 mile drive. Coolant temperature did not exceed 80 degrees C during the drive.
Truck has new air filter and all tubing is clear of obstruction.
Not sure about the catalytic convertor. Plugged ???
Maybe someone can read through all this and point me in a reasonable direction. I am not interested in changing to a mechanical wastegate or anything else that takes away from factory setup, so please no responses of that nature.
Thanks in advance for your help !
:skep:
