EXTENED CRANK

[Barry]

My 2003 Cummins has an extended crank of 5 to 10 seconds before starting. Have had over 10 Dodge Cummins, 6 new ones, and they always fired off almost instantly.
Had an Air Dog pump and new High Pressure pump installed. No change. Anyone else had this problem and know the cure ?

TIA !

 

[AH64ID]

Extended crank is often caused by failing injectors or a HPRV.

 

[FOXY005]

Looks like it's time to get the injectors tested, sounds like the injectors are the culprit.

 

[Darkbloodmon]

Verify the pump was bleed properly to isolate the scope of the symptoms. If you're getting delivery and the pressure you need look at the high pressure side. Injectors, and HPRV are often the culprit. Verify with a gauge or scan tool that can measure the fuel pressure on the high side while cranking. From memory I think you need aprox. 4K Psi out the injection pump to turn over. Additionally about 4 secs is nominal turn over time according to my 03 FSM, anything less is pretty healthy, anything over should be investigated.

A quick and dirty way to test would be to unplug the FCA and crank, this will allow maximum injection pump pressure while cranking, should be a near instant turn over. If it cranks over nominally with the FCA unplugged and not while it is you've got a high side pressure issue.

How many miles do you have on the truck and injectors?

 

[Barry]

Extended crank is often caused by failing injectors or a HPRV.

Thanx ! I suspected that.

 

[Ozymandias]

How many miles on the injectors and for how long with stock filtration?

 

[Barry]

How many miles on the injectors and for how long with stock filtration?

Truck has 130K original miles. New Air Dog system 1,000 miles ago. New High Pressure Pump 5 miles ago.
Thanx for your lengthy post detailing what to look for.

 

[Ozymandias]

It's basic Information that I was asking for.

The stock injectors weren't that great, had many revisions from BOSCH through the last almost twenty years.
Yours run for almost it's life with stock filtration that is known to be below par and harm the pump and the injectors.

So, the chances are high that your injectors are worn out.

And next, if you go shopping for injector's, don't buy the cheapest ones. If you find a vendor you would like to buy from, ask us first about it, many are known as cheaters.
Selling china fake stuff or plain wrong Injector's that don't fit your setup.

 

[Barry]

It's basic Information that I was asking for.

The stock injectors weren't that great, had many revisions from BOSCH through the last almost twenty years.
Yours run for almost it's life with stock filtration that is known to be below par and harm the pump and the injectors.

So, the chances are high that your injectors are worn out.

And next, if you go shopping for injector's, don't buy the cheapest ones. If you find a vendor you would like to buy from, ask us first about it, many are known as cheaters.
Selling china fake stuff or plain wrong Injector's that don't fit your setup.

 

[Barry]

When I called JC @ Genos to ask if they had a High Pressure Pump, he turned me on to their supplier, City Diesel in Decatur, Al. CD is the only authorized Bosch repair facility in Alabama . I will buy the injectors either from Genos or City Diesel.
CD is the supplier for Genos for Turbo Actuators. Price being same on injectors, I'll buy from Genos to keep the business in the family.

 

[Barry]

When I called JC @ Genos to ask if they had a High Pressure Pump, he turned me on to their supplier, City Diesel in Decatur, Al. CD is the only authorized Bosch repair facility in Alabama . I will buy the injectors either from Genos or City Diesel.
CD is the supplier for Genos for Turbo Actuators. Price being same on injectors, I'll buy from Genos to keep the business in the family.

Whadiyathink about ReMan injectors from a Bosch Certified shop ?

 

[Ozymandias]

We had very mixed results with remans - only ones that are proven good, always, are the ones from BBi.
https://www.bigbanginjection.com/pr...MI8f-Ns7yf8wIVzGxvBB0PLAzdEAAYASACEgL2rPD_BwE
This company really knows the business.
I'd spend the money to them within a blink of an eye if going the reman trail.

Big Bang Injection is an Austrian company that was founded in 2012. What started as a part time venture, evolved into a full time enterprise manufacturing High Performance Common Rail Injectors. We, the owners of Big Bang Injection (Martin Schöppl and Jürgen Tanzer), bring to the table a combined 30 years of HANDS ON Common Rail Injector experience as we were employed at the Robert Bosch GmbH Common Rail Injector Lead Development Facility for commercial vehicles, located in Linz, Austria. Lead Development Facility. This is where the magic happens. Design, development, proto typing, assembly, testing….

 

[Barry]

HAVE YOU CHECKED YOUR CRANK/CAM SENSOR LATELY ?

 

[Darkbloodmon]

HAVE YOU CHECKED YOUR CRANK/CAM SENSOR LATELY ?View attachment 130974

I'm pretty sure the crank sensor will failsafe to the cam sensor if I remember correctly from my 03 FSM. If at least one is working it shouldn't keep you from turning over. Crank is main, secondary is cam.

 

[Ozymandias]

From what I know it needs both sensors at start-up to determine Cyl#1 and firing order.
As soon as it runs, either sensor is fine.

 

[Darkbloodmon]

We both got a piece of it right this time.

03 FSM / 8I - 10 ignition control / Operation / 5.9 Diesel

The camshaft position sensor (CMP) provides a signal to the Engine Control Module (ECM) at all times when the engine is running. The ECM uses the CMP information primarily on engine start-up. Once the engine is running, the ECM uses the CMP as a backup sensor for engine speed. The crankshaft Position Sensor (CKP) is the primary engine speed indicator for the engine after the engine is running.

Cam sensor is primary on start up, secondary fail safe after the engine is running.