Hard cranking

[RagingCajun]

Is it usual for it to take a while to crank the new 03'. It just don't start like my old one. I don;t know is you still have to wait before starting.

 

[Fred Swanson]

Actually it should start fairly quick.

 

[SRadke]

There is a little yellw light on the dash that looks like a filament that is the intake manifold heater. Not nescessary to wait for but not a bad idea. No, they don't start like old ones, at least not like the 12 valves.

 

[Ladders]

Yea, I hate that l o n g cranking, compared to the "older" ones also. It takes the oil pressure to register before the computer will "release" the rest of the electronics that are required for the eng to run. SUCKS, but dats da way it is.....





SOTSU!!

\\BF//

 

[Boonieman]

My '03 also takes a few revolutions to fire up also. My '01 would start instantly. I thought something was wrong too, until I read a few posts where other folks were noticing the same thing, so I'd say it's normal for the '03.

 

[nickleinonen]

Originally posted by Ben Stair

Yea, I hate that l o n g cranking, compared to the "older" ones also. It takes the oil pressure to register before the computer will "release" the rest of the electronics that are required for the eng to run. SUCKS, but dats da way it is.....





SOTSU!!

\\BF//

so does that above statment mean that the engine ecu needs to read oil pressure before allowing combustion to begin? neat. saves some wear and tear on the bearings

 

[Prairie Dog]

Yes it's normal for the new computer controlled diesels to have to turn over more before they get accurate reading from all the sensors and allow the fuel to flow. It's the same with the new ferds and maxi pads.

 

[Evan A. Beck]

I don't think the oil pressure statement is true... It takes more cranking than a couple revs to get oil pressure. On all the electronic diesels I work on that have electrically actuated injectors, there has to be a clear signal from a crank sensor or cam sensor. Ever notice how your '03 sometimes starts faster than other times? This is depends on where the crank/cam position is when cranking begins. The crank uses a tone wheel on the front of the engine, and the cam gear also has 'windows' in it. These windows are not all the same, there is one missing which is at TDC. Once the ECM gets a clear signal as to where TDC is, it can give the command for the injectors to fire. You've probably heard about PowerStrokes and how they will NOT start with a bad cam sensor. Well, this is the only input for engine position on a PSD, and if the computer has no idea 'where' the engine is, it has no clue when to start firing the injectors in the correct order. Make sense?



The 98-02 ISB starts faster because it has a keyed injection pump, and is mechanically in sync with the engine. Fuel timing and quantity are elctronicallv controlled.

 

[Ladders]

If Mr. Beck says its so ... ... then I will take his word for it. I was told that the oil needed to up to press (about 2-10#s worth) and just "relayed" that info. It does make sense that all the inputs need to be there but which ones and for how long may be the question that needs to be pursued (if anyone REALLY cares).



SOTSU!!

\\BF//

 

[Bill Stockard]

Evan,



That's almost exactly what the Cummins factory people told me at the Rally in Columbus last year.



I asked them about the same question as Raging Cajun.



Bill

 

[Evan A. Beck]

Glad I could help clarify the cranking habits of the new animal.

 

[RagingCajun]

Thanks!

Thanks guys for all that information, I was just concerned about the length of time before that bad boy fired off.

 

[sag2]

Mine cranks for a few seconds before it fires up. I figure that's why they put a key starter, and not a crank on the front. Who cares how long it takes, just as long as it starts!

I should put the scan tool on it and watch the fuel pressure. It would be interesting to see how long the pressure takes to build to 5,000 PSI (about normal idle pressure).

 

[DPKetchum]

hey start like a EFI gas engine. I love the way my 93 starts. Just trying to get use to the 03

 

[CKimball]

... okay... . then I have a weird one... mine fires Right now (even when its cold out). . way quicker than my PSD ever did... i do tho wait till the light goes out and then another second after it does and then 1/2 to full turn of the motor and its clattering(Quietly) to my hearts content!!! mine is one of those smogged up low HP calif deals..... maybe there is a small benefit to owning a calif truck..... naww!!

cameron

 

[Dean Upson]

That was a great answer, Evan. Thanks.



Dean

 

[LightmanE300]

Hey guys. First post of what I'm sure will be many! I don't have a CTD yet but will soon, and own two diesels. Isn't the light you guys are referring to the glowplug light? If so, you're definitely supposed to wait for that to go out before cranking it over. Both of my diesels will have to crank a while to start too if I dont wait for the light... .

 

[Boonieman]

CTD's don't use glow plugs, they use manifold grid heaters that heat the incoming air. They do have a timer on them with an indicator light, similar to the glow plug system.

 

[Blakers]

Originally posted by Boonieman

CTD's don't use glow plugs, they use manifold grid heaters that heat the incoming air. They do have a timer on them with an indicator light, similar to the glow plug system.

But, unless it's below 50-some degrees out, the grid heater won't even come on and you don't have to wait for it at all.

 

[Vaughn MacKenzie]

psych satisfaction

I like the fact these take a second or two longer to fire. Gives you that much more time to get oil circulating before it lights off. Not that it makes that much difference but I guess it's a bit satisfying psychologically



Vaughn