Injectors fried?
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New User
Joined: Oct 2007
Posts: 10
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I'm in Covington, La.
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by jasefm
I'm in Covington, La.
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
Maybe the HPOP or the IPR valve, but not all eight injectors unless you gave it a load of bad fuel
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by jasefm
They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned.
dieselmann's PowerStroke Page
When the injector solenoid is actuated, it opens a poppet valve which allows high pressure oil to flow into the intensifier piston. The intensifier piston is forced down, pressurizing the fuel inside the injector. When fuel pressure inside the injector reaches approximatly 2700 psi, it causes the injector pintle to rise off its seat and fuel is injected into the cylinder from the nozzel. As long as the poppet valve is open and oil is flowing into the injector, fuel will be injected. The computer controls how long the injector solenoid is energized (pulse-width, or time on in milliseconds), but it also determines the pressure of the fuel being injected by controlling the pressure of the oil (IPR duty-cycle, or the percentage of time on vs. off--AKA dwell) in the cylinder heads. The computer determines this based on engine load and driver demand by monitoring various sensors. Since the cavity at the top of the intensifier piston is seven times the size of the fuel cavity at the bottom, fuel is injected at a pressure seven times that of the computer-controlled oil pressure--oil pressure 3000 psi = injected fuel pressure 21000 psi. Due to the high oil system pressures, the spring which closes the poppet valve once the injector solenoid is deactivated has to be very strong--and because of this, the solenoid needs to be 110 volts. Once the poppet valve is closed, spring pressure returns the injector to its normal state and the oil is exhausted into the valve cover area to return to the sump.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by jasefm
I'm in Covington, La.
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
Ijust went to the shop to try to limp it home. There were no error codes. It started for them the day before after cranking it to ten mins. It would not start for me. They say that dirty oil has clogged the injectors. They also say the the oil system in the injectors is a dead end system and can not be cleaned. The starter will turn but it won't fire. They say they checked the fuel and electrical to everything and it's all fine.
What now?
They are making assumptions without proper diagnosis.
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1994.5 - 1997 7.3L Power Stroke Diesel
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