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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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i have z 92 6.5 turbo 3500 if would stumble a bit when I revv it up and it idles down nod it idles rough and blows black smoke any help would b great... JOIN NOW TO REMOVE TRACER

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  #1  
Old 01-08-2013, 06:11 PM
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Default White smoke

i have z 92 6.5 turbo 3500 if would stumble a bit when I revv it up and it idles down nod it idles rough and blows black smoke any help would b great
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  #2  
Old 01-08-2013, 08:26 PM
racer55's Avatar
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Status: familiar with the 6.5 and then some

   

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Injectors ever been changed?
IP ever been changed?
How does it start hot?
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  #3  
Old 01-08-2013, 08:53 PM
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Injectors havent been changed starts fine hot or cold
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  #4  
Old 01-08-2013, 09:03 PM
racer55's Avatar
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Black smoke is too much fuel,could be leaking injectors or injectors that are popping off too early?
Or a dirty air filter.
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  #5  
Old 01-08-2013, 09:24 PM
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White smoke sorry
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  #6  
Old 01-08-2013, 09:28 PM
racer55's Avatar
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Any bubbles in the rad when running?
Does the upper rad hose get hard as soon as you start a cold engine?If so then likely a blown head gasket or cracked cylinder head.

Could also be incomplete combustion if it only does it cold and be caused by non working glow plugs?
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  #7  
Old 01-08-2013, 09:28 PM
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Does the smoke smell like fuel or does it smell sweet ?

acesneights1's Sig:1986 M1008 CUCV. Raptor 100 LP.. 4 inch lift..
DB2-4911 IP. GM4 Turbo. Redneckmaster 5inch Exhaust
Autometer Fullsweeps.
NV4500. Sepr belt conversion. 12v Conversion
ARP Studs. Marine Injs.HO 6.5 Cooling System. Duramax fan
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  #8  
Old 01-09-2013, 04:41 AM
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I also get diesel in crank case it smokes white immediate after starting
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  #9  
Old 01-09-2013, 07:41 AM
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Non working glow plugs in some cylinders along with pissing injectors is a good bet.
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  #10  
Old 01-09-2013, 07:08 PM
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If you have no problems with the cooling system, you could try to adjust your IP timing. I'd venture a guess to say that it needs a complete rebuild.

cviola2005's Sig:1993 Chevy 3500 Crewcab Dually 6.2 (0.020" over) turboed, port matched and polished, 6.5 mech IP turned up 1/4 turn, 6.5T injectors and lines, GM-4 turbo with Porsche K27 compressor wheel. NV4500 trans (swapped from 4L80E), 3.73 rear gear (welded). LED: cab lights, cargo light, taillights, interior lights, blue LED dash lights. Headache rack and 4" stacks
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