05 E-450 very intermitent no start

[batmantech]

Got o5 E-450 bus that will very randomly not start. Was towed here, went out to lot verifed no start normal crank, pushed in shop. After doing koeo went to datlogger hit key started right up. Only thing I can see is ficm power concerns L,v will drop to 5-6v m 29v but it will start. new ficm same thing. Load tested ficm c powers and grounds all ok. Do you think this is an indicator of the problem? or am I just chasing my tail until I can duplicate this again? I don't see many E series so any input would be great. [update: Just found out that when the bus does no start the bus company has been spraying it with ether, then it starts and continues to run fine. Happens with engine warm or cold.]

[batmantech]

Hotline response:

 

The E-Series FICM L & V power supplies are set up differently than an F-Series. These power supplies are shared with multiple components and can result in low initial FICM L/V/M power readings. As long as the FICM powers return to their normal range, no concern is present.

 

Well aparently those voltages are of no concern. Guess I will just have to keep trying to duplicate it.

[Mbl35]

Check all battery connections thuroughly and remove and inspect the ipr, the screen may have separated.

[batmantech]

Finally got to duplicate concern. Made recording, mutiple things look strange but the CKP goes 0 to 19 rpm. Checking out the ckp sensor Sensor sleeve broke off in block looks like the housing was cracked almost all the way around at outer end. Small amount of rust on block. Getting a new sensor will verify then.

[batmantech]

update new sensor same. Datalogger showing 0-24 rpm when it is cranking. moved pcm c176c and starts, poor connection at pcm.

[Keith Browning]

The 'ol wiggle test in dynamic fashion!

[2006]

I see a lot of e-series with wierd cmp and ckp issues. They always seem to clear up if you disconnect the pcm or the sensor connectors. The problems seem to go away for a few weeks then come back with the same concern. A new harness always fixes it. I never see anything wrong with the old harnesses. May it had poor pin fits or shielding?

[Aaron]

Rubbed through internally, I'm guessing.

 

I see a lot of problems when I wiggle the harness right at that big ball of shit near the fuel filter housing where the CMP wiring comes into...

 

E-series + 6.0 is always a recipe for pain.

[Gofaster23]

I'd say toss an engine harness on it. I never use the term "toss" but with an E-series with this concern, if there are absolutely no high pressure oil leaks, an engine harness will always fix the concern. You'll probably have no luck locating the chafe either.