Hey guys, I am stuck in Wyoming after my 07 Mega died on the highway.

I was travelling about 70 mph under light load, only about 650* EGT and 8 psi boost. All of a sudden I get a complete loss of power and some rattling from the engine.

Stepping on the throttle pretty much does nothing and I come to a stop in about 1/8th mile. I check it for codes and nothing comes up, except the Camshaft Position Sensor which has been there for a week or two (my sensor is broke and the replacement is sitting in my glovebox) along with some "Fan Speed" code.

I try starting again after clearing the codes and it sputtered a bit and then just cranked and cranked with no sputtering.

Oil pressure was fine as it was dying also. Is this a fuel problem? Could my lift pump have died and caused this all at once?

I am on my way home to Canada and no shops are open in this town all weekend... It is pretty frustrating. Thanks for any help!

 

Well. My first guess would be the.......hmmm....camshaft sensor.
If it stops working, so does the engine. The computer won't know where the cam is to fuel. Replace it, start it up, and be on your way.

 

Do you know that for sure? I thought I read on here that a failed one will cause problems during startup but otherwise it'll run fine. When the CPS failed a week or two ago it just threw a soft code and check sum error code.

It was having an intermittent long startup condition, and a the odd rattle during idle, but would run 100% once it was getting throttle.

Also, I taped up the wires that are known to wear out on the A/C lines by the oil filter and interfere with the CPS signal.

 

If you've had the code, that is the first thing I would fix. I can see a faulty sensor allowing it to run, but if it's totally broken and not sending any signal, How does the computer know when to fuel ?

 

Can you hear the LP when you bump the key?

 

i agree fix the sensor first then go from their rattling noise sounds like timing issue with fueling

 

I turned the key ahead last night to listen for the lift pump and did not hear it, but maybe I was too slow to get to the back and it would have cycled off already anyhow.

I am going back to the truck and going to try to get my replacement CPS sensor in... got to figure out what tools I need first though. I read on here

"the three wire camshaft position sensor (CMP) is located below the fuel injection pump,it is attached to the back of the timing gear cover housing.
the CMP performs multiple functions. one function is to detect engine speed, Another function is is to relate crankshaft position and top dead center of the no 1 cylinder because the CMP is now used to relate crankshaft position"

If this is right, it should be below the CP3 on the drivers side? I assume I'm going to need to buy a small metric set of sockets?

Thanks for the help guys.

 

Yes, that's where it is. I'm not positive, but if memory serves correctly, I believe you'll need somethin like 10 mm

 

I just changed the sensor... It's weird that the sensor reads off a ring on the front snout of the crankshaft. I thought it'd be poking through the front cover and reading a traditional "tone ring" like I have on my 5.7L Hemi.

Anyhow, I just changed it and it's still just turning over and coughing like it needs fuel. No change from what it was doing before.

We also listened to the lift pump and it is indeed running, although we don't know for sure if it's delivering fuel pressure or not.

Turns out there's a Cummins dealership nearby so I'm going to head over there and see if they have any answers.

Any more ideas?

 

How's your fuel pressure? I don't know where you're at, but I got a tank of not so good diesel in Guernsey, Wyo this summer. Fuel pressure started dropping to darn near zero on the highway. Didn't cause the rig to die or stop running, though. Changed the fuel filter in Sheridan. Made the stupid mistake of getting air in the line. At this point, it wouldn't start, of course. Dope slapped myself, bled the line and it fired right up. So, if your injection pump got starved for fuel, perhaps you've got air in the system... Good luck.

 

I would second questioning the fuel quality, how long before did you fill up?

If you have a question, do not force it, there are many who got a load of water and 10-18K later they were back on the road.

 

I picked up a tank of fuel in Vail, Colorado and put about 500 miles on that tank until the point it died. I don't think there's a problem with the fuel.

It's weird that it was running so well up until the point it quit. I have been getting over 700 miles on a tank of fuel and averaging around 21 mpg at 70-75 mph! Only mods at this point is an intake, Smarty on mid settings and the Quad boost fooler.

No codes are being thrown as I try to start it. The only help from the dealership was to either wait until their service dept opens on Monday or buy a new truck today lol. Looks like I'm stranded here until Monday at least.

 

cam shaft sensor is not on the crank shaft. it runs off the back of the cam gear on the backside of the gearcase. if you have a crank sensor it would be on the crank. but they are not the same thing. if you changed the crank sensor and the cam sensor is bad........you will have no change in your problem.

 

From this site, it is my understanding that they just have a blank plate over the place you are talking about on the common-rail trucks. The one mentioned in this article:

http://www.dodge-diesel.org/articles/cps/ckp.htm

The "CPS" is on the front of the engine under the CP3 and runs off the crankshaft of the common-rails from what I understand... can anyone clarify this?

 

That is incorrect, check the other thread. The cam sensor is in the back of the timing cover and looks identical to the crank sensor.