wont start - Competition Diesel.Com

stroke73 · 07-19-2011, 09:40 PM

Ok I got a 6.7 cumins in my ford superduty. Got the smarty on it and it has been running great until today. I put my mp8 on it and ran ok for a min then ran rough. So I shut it off and unplugged the mp8 and hooked everything back up normal and it still ran rough. Drove it down the road and it was running so bad I turned it off and it wont start back. It'll crank all day long blowing smoke out the pipe but it wont hit a lick. I tried a new rail pressure sensor and that didn't work and I tried disconnecting the battery's and putting the stock settings back on it and that didn't work either. Any help would be appreciated

coorsman2005 · 07-19-2011, 10:09 PM

mine ran rough once and ended up being one of the wires to the rail psi gauge grounded out or if u have an electronic gauge make sure the wires arent backwards that will do it also have you checked your releif valve

stroke73 · 07-19-2011, 10:13 PM

Yea my relief valve is working good. Just checked it a few days ago and I don't have any kind of rail pressure guage on it. Kinda has me puzzled. I mean it was running great till I put that mp8 on there and now it wont even hit

coorsman2005 · 07-19-2011, 10:25 PM

might check the rail psi and make sure its not weak just a guessim not real sure

JarrodB · 07-19-2011, 10:54 PM

glad to see someone actually has a 6.7 in a SD truck when im told from the people here in my area that the 6.7s are too big to fit.

stroke73 · 07-19-2011, 11:05 PM

Yea it fits good. I got some pics on my phone that I need to get on here. Beans diesel made it a show car. If only I can figure out why it wont start now.

rbmedic75 · 07-20-2011, 02:47 PM

curious as to what ya did to test the relief valve. commonly on the 6.7 once those things POP they don't re-seat correctly and will bleed off. I'm thinking This may be the case. IE FWIT the 6.7 supplies more fuel and with the SMARTY you can turn RP beyond the safe limit. No way ya need the Mp8 on there also

*Krazeeun* · 07-20-2011, 11:40 PM

Quote:

Originally Posted by bockhold

glad to see someone actually has a 6.7 in a SD truck when im told from the people here in my area that the 6.7s are too big to fit.

5.9's and 6.7's are the for all intensive purposes, externally identical, to include size lol

coorsman2005 · 07-21-2011, 04:35 PM

Quote:

Originally Posted by Krazeeun

5.9's and 6.7's are the for all intensive purposes, externally identical, to include size lol

thats what i was thinking but i was going to keep my opinion to my self

rbmedic75 · 07-21-2011, 07:13 PM

Yep a lot of the parts are interchangeable. same block just bored a little bigger

JarrodB · 07-21-2011, 08:39 PM

so with that being said, the cyl walls are thinner. so would there be a cavation issue then? like when the 6.9 went to the 7.3 in the idis?

JAWilson · 07-21-2011, 10:58 PM

How hard did you run it before it quit? I've seen mp8s bust injectors...

chvyrkr · 07-21-2011, 11:08 PM

Quote:

Originally Posted by bockhold

so with that being said, the cyl walls are thinner. so would there be a cavation issue then? like when the 6.9 went to the 7.3 in the idis?

No...

There's actually a sufficient amount of steel in that block...

Goose · 07-21-2011, 11:09 PM

Quote:

Originally Posted by stroke73

Yea it fits good. I got some pics on my phone that I need to get on here. Beans diesel made it a show car. If only I can figure out why it wont start now.

Was your truck at the past dyno day?

07-19-2011, 09:40 PM	#1
stroke73 Name: stroke73 Title: Rookie Status: Not Here Join Date: Sep 2009 Member`s Gallery Posts: 23	wont start Ok I got a 6.7 cumins in my ford superduty. Got the smarty on it and it has been running great until today. I put my mp8 on it and ran ok for a min then ran rough. So I shut it off and unplugged the mp8 and hooked everything back up normal and it still ran rough. Drove it down the road and it was running so bad I turned it off and it wont start back. It'll crank all day long blowing smoke out the pipe but it wont hit a lick. I tried a new rail pressure sensor and that didn't work and I tried disconnecting the battery's and putting the stock settings back on it and that didn't work either. Any help would be appreciated

07-19-2011, 10:54 PM	#5
JarrodB Name: JarrodB Title: Oilfield Trash Status: Not Here Join Date: Oct 2010 Location: Bryan/College Station/Tyler, TEXAS Member`s Gallery Posts: 2,607	glad to see someone actually has a 6.7 in a SD truck when im told from the people here in my area that the 6.7s are too big to fit. __________________ 2006 F250 CCSB FX4 2013 VW Jetta S 2013 2500HD EXLB 4x4

07-20-2011, 02:47 PM	#7
rbmedic75 Name: rbmedic75 Title: Cummins Fanatic Status: Not Here Join Date: Apr 2009 Location: Berkeley Springs Member`s Gallery Posts: 277	curious as to what ya did to test the relief valve. commonly on the 6.7 once those things POP they don't re-seat correctly and will bleed off. I'm thinking This may be the case. IE FWIT the 6.7 supplies more fuel and with the SMARTY you can turn RP beyond the safe limit. No way ya need the Mp8 on there also __________________ 08 fully Boderized SOLD but I still get to work on and drive it for 6 months 2012 Laramie Longhorn Mega just arrived and awaiting transformation

07-21-2011, 07:13 PM	#10
rbmedic75 Name: rbmedic75 Title: Cummins Fanatic Status: Not Here Join Date: Apr 2009 Location: Berkeley Springs Member`s Gallery Posts: 277	Yep a lot of the parts are interchangeable. same block just bored a little bigger __________________ 08 fully Boderized SOLD but I still get to work on and drive it for 6 months 2012 Laramie Longhorn Mega just arrived and awaiting transformation

07-21-2011, 08:39 PM	#11
JarrodB Name: JarrodB Title: Oilfield Trash Status: Not Here Join Date: Oct 2010 Location: Bryan/College Station/Tyler, TEXAS Member`s Gallery Posts: 2,607	so with that being said, the cyl walls are thinner. so would there be a cavation issue then? like when the 6.9 went to the 7.3 in the idis? __________________ 2006 F250 CCSB FX4 2013 VW Jetta S 2013 2500HD EXLB 4x4

07-19-2011, 10:09 PM	#2
coorsman2005 Name: coorsman2005 Title: i like beer Status: Not Here Join Date: Jun 2011 Location: blackwell,ok Member`s Gallery Posts: 784	mine ran rough once and ended up being one of the wires to the rail psi gauge grounded out or if u have an electronic gauge make sure the wires arent backwards that will do it also have you checked your releif valve

07-19-2011, 10:13 PM	#3
stroke73 Name: stroke73 Title: Rookie Status: Not Here Join Date: Sep 2009 Member`s Gallery Posts: 23	Yea my relief valve is working good. Just checked it a few days ago and I don't have any kind of rail pressure guage on it. Kinda has me puzzled. I mean it was running great till I put that mp8 on there and now it wont even hit

07-19-2011, 10:25 PM	#4
coorsman2005 Name: coorsman2005 Title: i like beer Status: Not Here Join Date: Jun 2011 Location: blackwell,ok Member`s Gallery Posts: 784	might check the rail psi and make sure its not weak just a guessim not real sure

07-19-2011, 11:05 PM	#6
stroke73 Name: stroke73 Title: Rookie Status: Not Here Join Date: Sep 2009 Member`s Gallery Posts: 23	Yea it fits good. I got some pics on my phone that I need to get on here. Beans diesel made it a show car. If only I can figure out why it wont start now.

07-21-2011, 10:58 PM	#12
JAWilson Name: JAWilson Title: Diesel Enthusiast Status: Not Here Join Date: Apr 2011 Member`s Gallery Posts: 236	How hard did you run it before it quit? I've seen mp8s bust injectors... __________________ 2010 CCSB, 68rfe, H&S, Industrial Injection, Airdog, Amsoil, ARP, Maxxspool, Haisley, Stainless Diesel, Suncoast, TS performance, Fluidampr, afe Power, GDP...