Duramax Diesels Forum Truck of the Week
  #1  
Old 06-12-2017, 05:41 AM
cardiac cardiac is offline
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Default How to stop the Smoke

I just got the motor back in the truck and it smokes bad in any of the 5 positions, from starting off, to just cruising it smokes bad. Could I have left something unplugged? Before the hole in the piston it was fine with a sportmans cp3 and 30% overs, now with the motor back running it won't quit with the smoking. Balance rate's are -1.2 to + 4 on number 7 cyl. FRP is 6500 at idle and 29000 at wop. off idle at 1300 it's 12000. Can the ECM be bad and not sending the right signal?
New 16.5, .020 Fingers pistons, with .075 valve relief. new Carrillo rods, new Dan’s diesel 68mm turbo, used 60% over Exergy injectors, 1/2” fuel line feeding used 10mm Exergy CP3. Bored block .020, .037 head gaskets, balanced rotating assembly and added Fluidamper.
Drilled fuel rails, driver .125 and passenger .090.
Dan's 800hp Trans
I think that’s about it.
Tuned by Dan and smoked bad. Drove to Ash Flat and had Torque Diesel spend 4 hrs and it still smokes bad. Sent the ECM off to Danville and it smokes just as bad. Me and the truck need any help we can get. No codes

Last edited by cardiac; 06-12-2017 at 06:09 AM.
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  #2  
Old 06-12-2017, 06:04 AM
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With those balance rates on #7 you have something really off. That could be your issue. It could be sticking.
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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by Ridge Runner. Twin Kennedy pumps & pickup. Glowshift gauges. Edge insight cts. Trimmed and lowered on Gear 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1992 Yamaha Waverunner 3
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  #3  
Old 06-12-2017, 06:09 AM
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IOWA LLY IOWA LLY is offline
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Check compression on #7, and then all down that side while your doing it.

If it's even, pull the injectors and have them tested.


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  #4  
Old 06-12-2017, 06:23 AM
cardiac cardiac is offline
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Default Compression

New motor with 350 to 365 on all 8
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  #5  
Old 06-12-2017, 06:49 AM
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zakkb787 zakkb787 is offline
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Sounds like you got a bad injector. That can happen when lines get cracked open
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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by Ridge Runner. Twin Kennedy pumps & pickup. Glowshift gauges. Edge insight cts. Trimmed and lowered on Gear 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1992 Yamaha Waverunner 3
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  #6  
Old 06-12-2017, 06:59 AM
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DAVe3283 DAVe3283 is offline
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Quote:
Originally Posted by cardiac View Post
...used 60% over Exergy injectors...
Sorry to say this, but that is your problem. I put a set of used 100% Exergy injectors in (fresh from Exergy "cleaned and checked out good") and my truck did just like yours. Smoked all the time, no one could tune it out.

I switched to a set of S&S SAC-style 75% overs and it runs clean!
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Old 06-12-2017, 07:25 AM
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Quote:
Originally Posted by DAVe3283 View Post
Sorry to say this, but that is your problem. I put a set of used 100% Exergy injectors in (fresh from Exergy "cleaned and checked out good") and my truck did just like yours. Smoked all the time, no one could tune it out.

I switched to a set of S&S SAC-style 75% overs and it runs clean!
The only injectors I'll EVER buy will be from Lincoln diesel. Heard too many horror stories about other companies. I can say I never heard any from Lincoln.
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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by Ridge Runner. Twin Kennedy pumps & pickup. Glowshift gauges. Edge insight cts. Trimmed and lowered on Gear 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1992 Yamaha Waverunner 3
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  #8  
Old 06-12-2017, 07:27 AM
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Awenta Awenta is offline
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Quote:
Originally Posted by zakkb787 View Post
Sounds like you got a bad injector. That can happen when lines get cracked open

Only the lb7 had that issue. None of the others used the injectors to seal the valve covers.


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  #9  
Old 06-12-2017, 07:41 AM
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Quote:
Originally Posted by Awenta View Post
Only the lb7 had that issue. None of the others used the injectors to seal the valve covers.


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I thought the issue was inside the lines where it seals and you crack them open and crap built up and slip into the injector. Which is why you should clean them. Either way not sure what year truck he has cause no signature. The 29k rail pressure makes me think newer but could have a newer fpr in it. Either way still a bad injector most likely.
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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by Ridge Runner. Twin Kennedy pumps & pickup. Glowshift gauges. Edge insight cts. Trimmed and lowered on Gear 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1992 Yamaha Waverunner 3
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  #10  
Old 06-12-2017, 08:20 AM
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Oval bowl pistons run dirtier than standard pistons. It takes some different tuning to get it cleaned up, and even then it still isn't as clean as a standard round bowl piston.
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  #11  
Old 06-12-2017, 09:13 AM
cardiac cardiac is offline
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2006 LBZ. Just changed the pass side 4 injectors back to my known no smoke 30% overs.
It's still smoking, maybe just wishful thinking but it seems to be cleaner than before on the heavy tow only. All other positions still looks like a kid with a cummins.lol
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  #12  
Old 06-12-2017, 09:47 AM
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so you have 30s on one side and 60s on the other?
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05 LLY CC/SB
Roderiques ATV Built Motor, HSP Twins, NLX88/Danville72R,
S&S 200s, S&S 10mm & LBZ, Tuned by Danville Performance
Suncoast Competition trans and Goerend Converter
1125hp/1628lbft 10.52@132

Thanks to
Chris @ Roderiques ATV in Westport MA
Mark Broviak @ Danville
Joe and Dave @ HSPdiesel
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  #13  
Old 06-12-2017, 11:05 AM
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Hahaha I think I see the issue here


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2003 CCSB LT LB7 deleted

Some cool stuff, some fast stuff, some slow stuff
EFI by Kory

Special thanks to Evan@Limitless
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  #14  
Old 06-12-2017, 11:26 AM
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zakkb787 zakkb787 is offline
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I think he means he has tried both and it smokes either way
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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by Ridge Runner. Twin Kennedy pumps & pickup. Glowshift gauges. Edge insight cts. Trimmed and lowered on Gear 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1992 Yamaha Waverunner 3
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  #15  
Old 06-12-2017, 11:58 AM
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Quote:
Originally Posted by cardiac View Post
2006 LBZ. Just changed the pass side 4 injectors back to my known no smoke 30% overs.
It's still smoking, maybe just wishful thinking but it seems to be cleaner than before on the heavy tow only. All other positions still looks like a kid with a cummins.lol
Quote:
Originally Posted by zakkb787 View Post
I think he means he has tried both and it smokes either way
Sounds to me like he only swapped one side
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05 LLY CC/SB
Roderiques ATV Built Motor, HSP Twins, NLX88/Danville72R,
S&S 200s, S&S 10mm & LBZ, Tuned by Danville Performance
Suncoast Competition trans and Goerend Converter
1125hp/1628lbft 10.52@132

Thanks to
Chris @ Roderiques ATV in Westport MA
Mark Broviak @ Danville
Joe and Dave @ HSPdiesel
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