Archived 3rd gen Running Problems

[lcaad1249]

My truck is an 04. 5. I was in the sled pull 3 weeks ago where I broke my output shaft and flexplate on a built transmission when I first noticed it. I was running smarty on 8 TST on 3 on 2 and EZ 2. When the transmission blew, the motor stayed revved and even accelerated. I turned the truck off even though it was hot because I was afraid it would overrev.



Got the new transmission in Saturday and the motor was doing the same thing, running wierd. I removed the smarty, TST, and turned the EZ to the lowest setting. No help. I read the codes and there was a restricted power due to engine temps and an P0602 HPCR overpressure code. I removed the EZ and it was a lot more driveable like the EZ magnified the bad signal.



Besides the transmission the only thing I chaned was adding the dipricol rail pressure gauge. The gauge alternated between 5000 psi at idle and 11,000 max. I have also tried removing the gauge to see about a bad connection with no help.



I thought the rail relief might be messed up so I removed the banjo bolt and capped the rail. This didn't change the available pressure range.



After capping the rail and driving around, I read my codes and got PO148 checksum error and PO602 HPCR Checksum error.





Do you have any ideas I could try. Any help you can provide is appreciated.

 

[Bob4x4]

If your lift pump is good,looks like an injection pump



Bob

 

[lcaad1249]

I've got a FASS on it now with no gauges. And a Glacier getting ready to replace it. Actually I have the gauge but need to hook it up.



I've talked to a few people who have been a big help. At first we thought it was the blow off valve (hence the capped rail) then possibly an injector, but sometimes it doesn't run bad. Now possibly a fuel valve on the side of the CP3. I know to test the injectors I can unplug two cylinders at a time to check, but is there any way to check the Cp3 or is the Rail Pressure Gauge only showing 11,000 PSI enough to say the its th CP3?

 

[Marco]

Code P0602 is the checksum error "caused" by Smarty. Nothing to worry about.
Don't even consider it for your trouble shooting.

The real problem is the rail overpressure. You should NOT see 11K at idle without a pressure box! I'd start to check the the rail pressure sensor connectors ( clean and grease ) to start with. More than the whole CP3, the FCA could be the culprit. Do a search on here lot's a good readings about the FCA.

Marco

 

[Bob4x4]

Whoops I missed the 11k was at idle... ... ...



Bob

 

[lcaad1249]

not 11,000 at idle, 11,000 max any time besides idle. It's 5,000 at idle, but sometime takes 10 seconds more that I think it should to return to the 5,000

 

[Bob4x4]

Disconect the fca wire and see if it goes up past 11k at idle it should rattle like crazy and go way up if the pump is good. Don't let it run long that way.



Bob

 

[lcaad1249]

Where is the FCA wire located?

 

[Bob4x4]

Look at the rear side of the injection pump(towards cab) a small can looking affair with a set of wires going in. Just unplug that.



Bob

 

[Tomeygun]

Disconect the fca wire and see if it goes up past 11k at idle it should rattle like crazy and go way up if the pump is good. Don't let it run long that way.



Bob

I had a dodge tech show me that - Woah! truck sounded crazy...



But would this test show an FCA that is internally broke? I mean even with no signal, what if the internal broke and would not allow the cp3 to fuel?

 

[lcaad1249]

Well its not the FCA, I tried unplugging the wire, it only revved to 11,000 psi. Wasn't sure if that was a definite for whether or not the FCA was bad so I swapped one in. I got the exact same systems.



To add more confusion, this time my passenger also noticed my ATS co-pilot's blue light flashing.



Also after having the other FCA I read my codes with the Smarty and it came up with PO251 (CP3 Pump Regulator Control) and PO148 (High Pressure Commonrail (HPCR) Checksum)

 

[Marco]

Possible causes for P0148

You have PM(s)!

Marco
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[lcaad1249]

Checked codes after drving to work and the only code in the ECM is PO148 (High Pressure Commonrail (HPCR) Checksum)

 

[lcaad1249]

Completely removed the TST and harnesses last night. I got in the truck today and the idle rail pressure was up more than normal (about 7500 psi) but still topped out at 11,000 psi. When I would give the truck fuel it would still smoke like it was chipped. I don't think I've drove my truck stock since I put the SPS62 on it. Would that make a difference over the factory turbo?

 

[lcaad1249]

Plugged in a different rail pressure sensor and it runs like a champ again!!