Some history..laid my truck up for winter, got it out and did a oil change and fuel filter change before I started driving it. Drained the fuel bowl so I bumped the starter about 5-6 times to allow it to fill before I started it, still ran dry of fuel. Cracked injectors and got it running but was stumbling a bit from air. Lasted about 1/2 hr before it cleared but also caused engine light on with 1690 code. Finally cleared up and light out, but the truck still has a different sound then i'm used to, more of a pingy sound and once in a while it seems to stumble when taking off.

 

Today about a month since the first case, I started it and engine light came on and stumbling alot @ idle, clears itself at about 1200 rpms and work fine, good power. Called my local Cummins dealer and talked to the guy I go to, he said from his info he'd point to the crankshaft sensor first if he had it there as its the cheapest and easiest place to start. I put a new sensor in and started it up, still runs like crap. So next it checking for wire chafes I guess and wondering if anyone experienced the same thing and where they found the problem. May help me cut some time and searching down

 

Have video but cant upload it here

Put the code reader back on the truck just to watch... this is what I saw... does it give any more insight? The truck was sitting still.

 

on left the engine speed is off by 4 on the two sensors  on the right they are matched at 827rpm

 

Just looking for more definite problems before I do something that intimidates me.

 

Tim

Edited March 25, 201510 yr by imbodie

Crank sensors tend to fail after they get hot and start doing weird things. Crank sensors don't create voltage but a frequency sine wave that the ECM counts for RPM (pulses per second).

SO... on my way to an interview this morning.... phone connected to radio by bluetooth, listening to my book and received a text message and the truck went WILD!!!! computer thinks tach jumped to 4grand...(it didn't) showed on my Edge Attitude.... and then truck dies....  I let it set all day while I'm at interview and I start thinking.... I installed the stereo about August of last year, I started throwing codes about August of last year.  I get home, go back to the truck, pull the radio, start the truck and drive it home (tach dead).  Get home shut truck down, clear the codes, start truck back up with scanner attached.... COULD NOT GET IT TO THROW A CODE!!!!! TRIED... Yesterday was throwing a code every couple of minutes... Tach working, truck running.... Radio sitting in passenger seat. 

Granted its going to take a lot more time and some guarded driving trips close to home, but I think the BLUETOOTH in the stereo was putting out a bit to much signal for my ECM's taste.

Never got to test for floating AC voltage, but I'm betting on that being the issue.

 

What do you guys think??

 

Tim

Hopefully you didn't mess up the stereo install and havee a wirin problem with the CCD network.

 

Last month replaced front door speakers, cut the power and ground wires for the speaker amps, had a 16xx something code when done. cleared code and no problem since.

So...  yep... still working on this issue...  IF I check #8 in the 

P0336 Crankshaft Position Sensor Signal

test procedures and the resistance is 5 ohms does this condemn my ECM??  Do I still need to do the rest of the tests?  AND if the answer is YES your ECM is bad... where do I get the best deal on a new one??

 

Thanks,

Tim