[LoganAllender]

Hey guys,

I took apart my intake this weekend for CBU cleaning.
Did the typical walnut blast for the intake, and degreaser for the swirl ports.

After putting everything back together, the engine will not start...

The starter motor is able to crank the engine, but I suppect it's not getting fuel supplied to start combustion and continue the crank. I'm not able to fully hear if the fuel pump is working.

OBDII revealed two codes: p0685 & p0237

I did not disconnect the negative battery terminal, as I was using a remote starter switch to open/close the valves as I was cleaning.

My suspicions are I may have either a bad connection from putting it back together, or a blown relay or fuse.

Any advice on the codes, where I could check the associated fuses & relays, or what else I may have done would be greatly appreciated.

Cheers!
Logan

[335dlci]

P0237 is related to your boost pressure sensor. check your connections. it is known that it may take a long time to crank after CBU cleaning... the other fault is related to DDE relay voltage.

[Dazza335iC]

Mine took a long time to fire up after the CBU cleaning. Make sure your battery is fully charged, and don't be afraid to crank for 15-20 seconds at a time. It may take 5-6 tries to get it. Just make sure you don't crank for >30 seconds, and give it some time in between tires to allow the starter motor to cool off; they can get very hot if ran continuously.

[LoganAllender]

Originally Posted by 335dlci

P0237 is related to your boost pressure sensor. check your connections. it is known that it may take a long time to crank after CBU cleaning... the other fault is related to DDE relay voltage.

Just to double check myself: The boost pressure sensor is located on the topside of the intake, by cylinder 5?

For the DDE relay: Would I find that in the ECU box on the passenger side? If the voltage is off, am I simply looking to replace that or is there a way to correct it?

[335dlci]

[QUOTE=LoganAllender;20880473]Just to double check myself: The boost pressure sensor is located on the topside of the intake, by cylinder 5?

For the DDE relay: Would I find that in the ECU box on the passenger side? If the voltage is off, am I simply looking to replace that or is there a way to correct it?[/] yeah but I don't think that would cause it to not start. the relay fault is most likely from cranking it over and over and draining the battery. as previous post, recommend using a battery charger while cranking after CBU.

[LoganAllender]

Ok. I'll check my connections, and try starting with a charger connected.

Thanks.

[335dlci]

Originally Posted by LoganAllender

Ok. I'll check my connections, and try starting with a charger connected.

Thanks.

After cleaning, I have had diesels take about 15-20 mins of non stop crnking to get them to start. just be easy on the starter to prevent overheating it or you will be replacing your starter soon after.

[lnxguy]

Originally Posted by 335dlci

After cleaning, I have had diesels take about 15-20 mins of non stop crnking to get them to start. just be easy on the starter to prevent overheating it or you will be replacing your starter soon after.

That's insane and completely avoidable. Even on the old rotary pump cars.

[BB_cuda]

When you cleaned, did you leave injectors connected to fuel rail? Or did you go the step further. Seems I recall folks having to purge the common rail if that got opened up. They had similar no start scenario as you prior to this.

Sleeper, what did you do after HPFP change out?

Yes, the manifold press sensor is about even with cylinder 5. Make sure it's plugged in good. Maybe unplug and replug to make sure it's well mated.

[LoganAllender]

Originally Posted by BB_cuda

When you cleaned, did you leave injectors connected to fuel rail? Or did you go the step further. Seems I recall folks having to purge the common rail if that got opened up. They had similar no start scenario as you prior to this.

I left the common fuel rail and injectors in tact. I did, however, disconnect the front electrical connection to the common fuel rail. I wouldn't think that would lead to a loss in pressure.

[BB_cuda]

What about that back connector to the common rail? I had to disconnect it to be able to get to that back nut.

[LoganAllender]

No, just the front connection.

Also, the car is running!!

Honestly, not sure what it was, I double checked all the connections, and gave it a few more attempts.

Car is running, and able to start/stop as usual.

Thanks guys!!

[lnxguy]

Good kill.

[temporaptor]

Maybe your dde and other modules weren't "asleep" before your disconnected the connector causeing the codes. I have heard it is recommended to make sure all modules are asleep before disconnecting stuff or else it can throw codes. Just one possible theory.