HELP!!7.3 WON'T START
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HELP!!7.3 WON'T START
I have a 2002 f350 that I am chasing a problem. new icp, new ipr, new HPOP,New fuel pump with prefilter, fresh batts and fuel in the bowl and no start.
ran AE scan tool before HPOP replaced.
1. Injector buzz test passed with no problems.
2. When we tried to run the cylinder contribution test, the engine died as soon as the first injector was dropped out by the test - I don't think it related to that injector.the RPM dropped too much. We repeated the test and the same thing happened again.
3. I have a DP tuner, and the engine would only stay running if the tuner was on the high idle program. If you took it back to stock, the engine died immediately.
The IPR Duty Cycle is at about 14% with the engine off, jumps up to about 65% while cranking, and then came back down to about 14% once the engine is running. ICP was around 650-700 psig.
I have replaced the fuel filter, injector cups & o-rings.
Before hpop replacement it would start with small amount of starting fluid but will not stay running at low speed/idle. after the replacement i finally got it started and it even would idle down. it died while idling and hasn't started since.
I am in Ct and have to be in TX in 2 weeks! any help would be appreciated.
ran AE scan tool before HPOP replaced.
1. Injector buzz test passed with no problems.
2. When we tried to run the cylinder contribution test, the engine died as soon as the first injector was dropped out by the test - I don't think it related to that injector.the RPM dropped too much. We repeated the test and the same thing happened again.
3. I have a DP tuner, and the engine would only stay running if the tuner was on the high idle program. If you took it back to stock, the engine died immediately.
The IPR Duty Cycle is at about 14% with the engine off, jumps up to about 65% while cranking, and then came back down to about 14% once the engine is running. ICP was around 650-700 psig.
I have replaced the fuel filter, injector cups & o-rings.
Before hpop replacement it would start with small amount of starting fluid but will not stay running at low speed/idle. after the replacement i finally got it started and it even would idle down. it died while idling and hasn't started since.
I am in Ct and have to be in TX in 2 weeks! any help would be appreciated.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
IPR maxing out while cranking to start means you're having trouble building oil pressure. How long has it been since you replaced the HPOP and injectors? You've got to get the air out of the rails for it to start quicker.
What is the IRP % when the truck does start up? ICP and IPR will stay higher for a little bit while the engine warms up, then when ICP drops to around 500 psi at idle, what does the IPR % look like? Any sign of oil in the bottom of your fuel filter bowl?
What is the IRP % when the truck does start up? ICP and IPR will stay higher for a little bit while the engine warms up, then when ICP drops to around 500 psi at idle, what does the IPR % look like? Any sign of oil in the bottom of your fuel filter bowl?
Post Fiend
Joined: Mar 2007
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From: Texas
I guess we should really ask what problem you've been chasing that caused you to change all those parts? This still may be your original issue or it may have just gotten worse and be unrelated to the parts you recently changed.
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Cups were replaced over a year ago due to fuel in radiator
batteries have lived on the charger since monday(2amp rate/6 during start attempts)cranking voltage is 11.5v
all started as truck would not start without ether (changed cps)
then it would not run at low rpms.(changed icp and ip.r loctite on ipr nut)
truck still would not start on its own
hpop reservoir would drain down(replaced hpop) reservoir stayed full and truck would idle down but died after 3 min and has not started since.
icp replaced due to oil in connector
ipr replaced due to bad impeadance
fuel pump was original an slow to fill fuel bowl
batteries have lived on the charger since monday(2amp rate/6 during start attempts)cranking voltage is 11.5v
all started as truck would not start without ether (changed cps)
then it would not run at low rpms.(changed icp and ip.r loctite on ipr nut)
truck still would not start on its own
hpop reservoir would drain down(replaced hpop) reservoir stayed full and truck would idle down but died after 3 min and has not started since.
icp replaced due to oil in connector
ipr replaced due to bad impeadance
fuel pump was original an slow to fill fuel bowl
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
I've heard stories about diesels getting addicted to ether (won't start without it after using it too many times). How is the compression on the engine? When you're cranking the motor and IPR is climbing to 65%, how fast does the ICP climb and does it stay above 2,000 psi for a while cranking with a no start? Have you monitored fuel injector pulse width while cranking? If you remove the oil fill cap, do you have pressure coming out the tube while cranking or if the truck is running? Did you disable the glow plug system before using ether?
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i don't have a scan tool but will have one this week and will get those numbers for you then.
is the pressure from the fill plug indication of bad rings?
is the pressure from the fill plug indication of bad rings?
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Yes, or worse. If there's pressure, then a compression test is in order. If you've got a cylinder or two low on compression, put a few drops of oil in the cylinder and test again. If the oil makes the compression numbers come up, that's a sign of bad rings.
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Elder User
Joined: Jan 2011
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From: Northern CO
After getting the truck started and running, when it dies have you checked the HPOP reservoir again? Does it matter at all if the truck is parked nose up hill or nose down hill? Just wondering if you have a low pressure oil problem and lack of feed to the HPOP.
Posting Guru
Joined: Jan 2007
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From: Gilbert Az.
Not to sound pretentious butbhave you checked your lube oil pump output? I had an almost identical problem last month and that's where I ended up..just sayin it may be worth a check and it's under a 75.00 replacement! Can't hurt
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