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Thread: 1999 Chevy
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09-13-2008, 11:49 AM #1Newbie
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1999 Chevy
My 1999 Chevy 5.0 305 is driving me crazy. Complete tune up,replaced the 02 sensor,cleaned the mass air flow sensor and still spits and sputters,blows black exhaust. Any suggestions Thanks Tommy
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09-13-2008, 12:01 PM #2Jr. Engineer
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how's your fuel filter have you changed that
2004 chevy silverado "northwest edition" lifted on 35's
1990 cherokee lifted on 32's
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09-13-2008, 12:08 PM #3Newbie
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Changed the fuel filter.Still no luck. Eating gas like crazy
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09-13-2008, 12:48 PM #4Moderator
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Sounds like your timing is retarded. Or, a bad ECM. I had probs like that and swapping out my ECM corrected the problem.
Darcy
Washington State
2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.
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09-14-2008, 12:39 AM #5Legend
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My first thought, with the blowing black smoke is that it is running rich. And the first reason that I can think of for it to run rich is a fuel delivery problem: either the FPR diaphragm has failed leaking unmetered fuel into the engine, or the fuel pressure is running really high. The first thing I'd probably do with the symptoms you describe would be to put a fuel pressure gauge on it, see what the pressure is, and see if the fuel system can hold pressure.
Originally Posted by tthompson
'98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
'92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
"My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World
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09-15-2008, 01:26 AM #6Legend
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i am gonna second what darcy said, your timing may be whacked or you are dumping fuel like crazy
PETE
95 GMC Sierra 2500
3" Body Lift, 33" Goodyear MTR's
5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
Sold :(
1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust
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09-15-2008, 06:09 PM #7Legend
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I agree with the above statements. I know it sounds stupid but how's your air filter?
Dan
1999 GMC Sierra 2500 350 vortec
1967 Jeep M725 ambulance 230 tornado
1990 Cherokee Limited- 3 inch lift on 33's
...and every one of em has issues
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