Any 05's with intermittent long crank?

[sag2]

Have been working on a couple with long crank sometimes. They are both six speeds, and nothing seems to be out of the ordinary to cause it. Cam and crank are in sync and with a lab scope the injectors are firing. Fuel supply is great, and no leaks from the pump or head return. It is very intermittent so it makes it tough to diagnose. Just wondering if there are any more out there.

 

[05mxdiesel]

I also have the intermitten long crank. I don't know if the TST is the cause of it, or if it is just the HPCR. But my truck has 13k on it now and it does not start like it used to. Makes me want a 12 valve. But again it is a lot quicker than my old PSD.

 

[johncameron]

There was a post not too long ago about this issue. It may not be a problem. The new HPCR engines need to turn a few revs before starting to find out where they exactly are via the crank sensor. Depending where they are in the stroke some starts are quicker than others.



HPCR owners please chime in.



JC

 

[Hoefler]

lomg crank time

I have mine in for this a number of times and they tell me it has something to do with crank sensor and cam sensor synchronizing with each other. It does when the engine is warm mostly. Will crank as long as 5-8 seconds at times. I only have 9k on mine and it has done it since new.

 

[Yo Hoot]

Same here. No real problem though.

 

[rbattelle]

Have been working on a couple with long crank sometimes. They are both six speeds, and nothing seems to be out of the ordinary to cause it.

Sag, how long are these crank times? They must be pretty long for you to believe there's a real issue at hand, and ask us about it (let's face it - you're the expert). What year are the trucks?



Is it possible they're getting air in the lines?



-Ryan

 

[GaryCarter]

Mine will long crank sometimes when I forget which truck I'm in and don't wait for the electric fuel pump to build pressure before cranking.

It has never happened if I wait for the wait to start lamp to go out.



Gary

 

[rbattelle]

Mine will long crank sometimes when I forget which truck I'm in and don't wait for the electric fuel pump to build pressure before cranking.

It has never happened if I wait for the wait to start lamp to go out.



Gary

I thought the 05s were programmed to keep the pump running after the wait to start light goes out to aid in starting?



Sag2, what year are these trucks?



-Ryan

 

[klenger]

Intermmttent long crank? ... And that's a problem?



Oh, you you were talking about the truck, weren't you.

 

[rbattelle]

Intermmttent long crank? ... And that's a problem?

Oh, you you were talking about the truck, weren't you.

Now that's funny right there... :-laf

 

[67guzzler]

I don't get it... . #ad

 

[msperos]

My 05' has the long crank problem sometimes. Kind'a embarrassing in a parking lot full'a people

 

[TFucili]

Intermmttent long crank? ... And that's a problem?



Oh, you you were talking about the truck, weren't you.

If it's more than four hours, please see a doctor...

 

[67guzzler]

If it's more than four hours, please see a doctor...

Ooooh. Now I get it. #ad




I always wondered if some dude would really see a doctor. I mean -- could you have a problem any more embarassing? Would you even want to explain it?

 

[Jaysyl]

The 05 does not start as quick as the 01 does. Some times on the 05, I will turn the key like normal,hold for 1 or 2 seconds, and it will not start right away. I have to crank it over again and hold it for 4 to 5 seconds. This just seems to be if the engine is hot. No problem cranking anything, other than the truck

 

[sag2]

They are both 05's and the customers report up to 15 seconds at times. By the way, STAR says up to a 20 second crank is considered normal for the HPCR!!! I don't know about you, but a five second crank seems like a minute. I'm guessing they are really 5-8 second crank times. The abnormal part for me is most of the time they have the normal 1-2 second crank. Also if you stop cranking if it does not start, and you start to crank again, it fires right up.

My theory is the cam and crank are not really in sync when the DRBIII says they are, but then duplicating the problem has not been easy. What I do know it isn't, is injectors, lift and CP3. That pretty much leaves software.

The only real change in 05 was dual mass flywheel. I wonder if it could cause a mild shake when cranking that the crank sensor does not like. If it is not perfectly in sync it is not going to start. Would be interesting to jumper the clutch switch and see if having the clutch disengaged makes a difference.

 

[67guzzler]

It could be but I honestly don't think the DMF is involved. I had a 2004. 5 w/48RE and it sometimes took several revolutions before it would fire -- say 1 out of 5 times. This 2005 w/the G56 is the same way... .



I'm not sure but I think if I delay after turning the key to run for like 3 seconds and then try to start it starts faster. I've started doing this even when it's warm.

 

[jcroman]

They are both 05's and the customers report up to 15 seconds at times. By the way, STAR says up to a 20 second crank is considered normal for the HPCR!!! I don't know about you, but a five second crank seems like a minute. I'm guessing they are really 5-8 second crank times. The abnormal part for me is most of the time they have the normal 1-2 second crank. Also if you stop cranking if it does not start, and you start to crank again, it fires right up.

My theory is the cam and crank are not really in sync when the DRBIII says they are, but then duplicating the problem has not been easy. What I do know it isn't, is injectors, lift and CP3. That pretty much leaves software.

The only real change in 05 was dual mass flywheel. I wonder if it could cause a mild shake when cranking that the crank sensor does not like. If it is not perfectly in sync it is not going to start. Would be interesting to jumper the clutch switch and see if having the clutch disengaged makes a difference.

HI,

My truck is doing the same thing and its a auto. it started right up the 1st few days after i bought it but know its about 1 in 3 or so i get a long crank. the longest so far was may 6 or 7 seconds but like you say it seems like a minute!

 

[swexlin]

It does when the engine is warm mostly

Yep, mine too. Cold starts are usually withing 1 second. Hoever, if the truck is up to temperature, and I shut it off to run into a store, and come back to restart withing a few minutes, it may crank up to 3 seconds.



Nature of the beast, it seems.

 

[HMistica]

Same here. Pretty much a stock truck other than the exhuast and AFE intake. Yes, sometimes it's embarassing when people are watching. Wouldn't bother explaining though. Are these long cranks bad for the engine? Sounds like it hurts.