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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 05-13-2017, 12:35 PM   #1 (permalink)
thunderhead1987
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need help new crank sensor now wont start?

hi, I been having problems with my 2005 c4500 6.6 so I tried 3 crank sensors and no luck . put the old one back in and starts right up .
Do I have to pull the battery post? never seen this before. 2 sensors from auto zone and one from Napa.

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Old 05-14-2017, 10:54 AM   #2 (permalink)
Ramblinrodney
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What's your code or codes? Why do you need a new crank sensor when it starts? It's only used to assist in starting. Have you checked your Reluctor Ring? You do know how? Wiring?

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Old 05-14-2017, 05:14 PM   #3 (permalink)
thunderhead1987
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Quote:
Originally Posted by Ramblinrodney View Post
What's your code or codes? Why do you need a new crank sensor when it starts? It's only used to assist in starting. Have you checked your Reluctor Ring? You do know how? Wiring?


Yes I checked the Reluctor Ring It doesn't move and I checked wires. It runs fine until it reaches temp and then misses and cant get balance rates in park . I do know the crank sensor will do weird things sometimes when going bad . The balance rates are real good . had a code 1093 pop up .
changed the filter and now it misses at ide when reaches temp, and I don't know why it wont take a new crank sensor.
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Old 05-15-2017, 08:50 AM   #4 (permalink)
Rvn4me
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So what is your code? Like said above, crank sensor is only used for starting.
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Old 05-15-2017, 05:08 PM   #5 (permalink)
thunderhead1987
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Originally Posted by Rvn4me View Post
So what is your code? Like said above, crank sensor is only used for starting.
There is no code It Just misses when it warms up . It doesn't when its cold just when it gets to temp. No smoke at all unless I stomp on it and its just a light black haze then quits. I Installed a new CP3 last year and it came with a new Fuel regulator . I moved wires around and Ice picked 2 7 and 5 . All so I did a injector clean and it brought my injector balance rates way down .
Any Ideas?
Thanks
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Old 05-16-2017, 09:19 AM   #6 (permalink)
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Idle only? Use scan tool to isolate one cylinder at a time. You need to ice pick every injector. Are you running the test hot (after a hard drive) and in drive will give the most consistent results have you checked your Fuel pressure regulator, check to make sure it is not stuck? Have you checked your fuel pressure relief valve (high pressure limit valve), check to make sure it is not leaking into the return system when rail pressure is 160 MPa? Have you make sure there are no high pressure fuel leaks? cap set to cap off the injector rail to isolate the injectors from the injector return system.
Use vacuum gauge, check the suction, you should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. If you have too much suction, after changing the fuel filter, the restriction could also be the sock in the tank. Too little vacuum (less than 2 inches Hg) means that it could be sucking air.
Have you Check for air in fuel system? install clears lines before and after the filter housing to check for air in the lines.
Have you Confirm actual versus desired rail pressure, even under crank no start conditions? Is it more of a lope?
You really need a lift pump.
There's so much to check and to many questions. We have no idea what you have tried and seems like we're wasting our time.
Why are you messing with the crank sensor? If you ever needed to replace only use GM or ACDelco.

Last edited by Rvn4me; 05-16-2017 at 09:39 AM.
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Old 05-16-2017, 07:35 PM   #7 (permalink)
thunderhead1987
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Quote:
Originally Posted by Rvn4me View Post
Idle only? Use scan tool to isolate one cylinder at a time. You need to ice pick every injector. Are you running the test hot (after a hard drive) and in drive will give the most consistent results have you checked your Fuel pressure regulator, check to make sure it is not stuck? Have you checked your fuel pressure relief valve (high pressure limit valve), check to make sure it is not leaking into the return system when rail pressure is 160 MPa? Have you make sure there are no high pressure fuel leaks? cap set to cap off the injector rail to isolate the injectors from the injector return system.
Use vacuum gauge, check the suction, you should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. If you have too much suction, after changing the fuel filter, the restriction could also be the sock in the tank. Too little vacuum (less than 2 inches Hg) means that it could be sucking air.
Have you Check for air in fuel system? install clears lines before and after the filter housing to check for air in the lines.
Have you Confirm actual versus desired rail pressure, even under crank no start conditions? Is it more of a lope?
You really need a lift pump.
There's so much to check and to many questions. We have no idea what you have tried and seems like we're wasting our time.
Why are you messing with the crank sensor? If you ever needed to replace only use GM or ACDelco.
Ok, new fill filter head and filter / FPRV /FPR / NEW CP3/ ICE Picked all injector ends / looked for chaffing on wires on alternator and FICM / checked grounds / checked reluctor ring/ . didn't do the vacuum test or bottle test yet . no sock in tank. rail pressure is actual and desired by a few hundred pounds. I took it to a diesel doctor today and he listened to it and said he never heard any thing like that . He's a Duramax specialist .
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