CRANK NO start!!
Thread Starter
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New User
Joined: Dec 2013
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CRANK NO start!!
help me out guys
2002 7.3
ok guys here we go. truck has been sitting and now won't start
here is what i have
11.2 cranking volts
rpm is 150
icp voltage is 3.6v
problem!!
ipr% is 38-50% cranking
HPOP pressure from 2200 to 3000 psi after it cranks for a few seconds
what ya thinking? ipr stuck?
i tired changing icp and it was the same thing
2002 7.3
ok guys here we go. truck has been sitting and now won't start
here is what i have
11.2 cranking volts
rpm is 150
icp voltage is 3.6v
problem!!
ipr% is 38-50% cranking
HPOP pressure from 2200 to 3000 psi after it cranks for a few seconds
what ya thinking? ipr stuck?
i tired changing icp and it was the same thing
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
What are you using to monitor data? 2200 plus PSI of ICP is plenty of pressure. How does the truck act while cranking at that pressure? Any smoke out the tailpipe? Does it sounds like it's trying or does it just fast spin?
Can you monitor pulse width or buzz test the injectors?
Can you monitor pulse width or buzz test the injectors?
Thread Starter
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New User
Joined: Dec 2013
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solus scanner.
i think the pressure is too high?
injector 1 is high to low open. thats the only buzz test code i get
if i spray some either she will try to start but won't start. turns over good. no smoke out of tail pipe.
without either it wont even try to kick.
just pulled ipr and took it apart. plunger does move. possibly bad coil?
i think the pressure is too high?
injector 1 is high to low open. thats the only buzz test code i get
if i spray some either she will try to start but won't start. turns over good. no smoke out of tail pipe.
without either it wont even try to kick.
just pulled ipr and took it apart. plunger does move. possibly bad coil?
Thread Starter
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New User
Joined: Dec 2013
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yes oil in connector, cleaned and replaced it already. same thing.
yes they buzz test, number 1 failed and said high to low open.
fuel pressure is ok aswell
i can't see the 1 injector making the truck not run at all. also in the past i have had 7.3 trucks fail buzz tests on multiple injectors and ran fine..
this truck does not even TRY to start.. just cranks
steve
yes they buzz test, number 1 failed and said high to low open.
fuel pressure is ok aswell
i can't see the 1 injector making the truck not run at all. also in the past i have had 7.3 trucks fail buzz tests on multiple injectors and ran fine..
this truck does not even TRY to start.. just cranks
steve
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Pressure climbing that high is a good sign for the IPR and HPOP working. Need to focus on why the injectors are not firing.
When you buzz tested the injectors, did they actually buzz? Have you verified fuel pressure?
When you buzz tested the injectors, did they actually buzz? Have you verified fuel pressure?
Thread Starter
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New User
Joined: Dec 2013
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the duty cycle being 50% is ok?
yes when i buzzed them.. they all sound good and click fine.
fuel pressure is good
steve
yes when i buzzed them.. they all sound good and click fine.
fuel pressure is good
steve
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More Turbo
Joined: Jun 2009
Posts: 580
Likes: 58
From: Michigan
How are you testing fuel pressure and how much FP do you have?
On these you have a pipe plug in the front of the head on the passenger side that is where have to put a gauge, kinda PITA.
On these you have a pipe plug in the front of the head on the passenger side that is where have to put a gauge, kinda PITA.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
50% duty cycle and 3,000 psi cranking won't hurt anything. How long as the truck been sitting?
With no smoke, the injectors are not firing. We need to figure out why. Oil level full? Any work done to it before the no start? How long does it take to build up to 2 or 3 thousand psi when cranking?
With no smoke, the injectors are not firing. We need to figure out why. Oil level full? Any work done to it before the no start? How long does it take to build up to 2 or 3 thousand psi when cranking?
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
Thank you for coming back and letting everyone know what the problem was. So many times there is a question which hopefully gets resolved, but the original poster does not come back with the solution. The reason I find this site so helpful and interesting is that there is an opportunity to learn in little steps by reading each short troubleshooting story. These otherwise complicated vehicles then begin to make a lot of sense to even those like me without any formal diesel training. Glad you got it fixed. That is why that sensor is in many glove boxes or tool boxes. The tach not bouncing during cranking is supposedly a sign of a bad sensor, not sure if that is always the case.
Larry
Larry
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
There probably was a reason why the engineers made the change in the tach operation, but it sure seems like auto manufacturers and their suppliers have an endless stream of changes even during a single year. Job security, maybe? It is a little bit like going to Costco, even the employees don't know where the peanut butter is, they move it all the time.