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10-06-2011, 01:32 PM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Rogers, Ar.
Posts: 65
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Smokes upon start-up ?
My '94 K1500 5.7/4L60E blows smoke for almost a minute when I first start it and then runs fine with no excess smoke. I'm guessing the computer takes that long to adjust something. I've put new plugs, O2 sensor and cooling sensor in it. What else should I check ?
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'94 Chevy K1500 Ext.Cab/Short Z-71 4x4 350 TBI/4L60E (my tow rig)....and assorted other vehicles. 
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10-06-2011, 02:59 PM
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#2 |
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Registered User
 Join Date: Sep 2011
Location: Selah Wa
Posts: 153
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Re: Smokes upon start-up ?
Might be valve seals are worn, allowing a small amount of oil to seap into the cylinders when after you shut it down.
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10-06-2011, 05:55 PM
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#3 |
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Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
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Re: Smokes upon start-up ?
What color smoke? Mine puffs a cloud of blue smoke, but that's just from bad valve stem o-rings. Got em, but just haven't changed them. If your's does it that long, it sounds fuel related. Does it smell rich? Does it do this when hot or cold? Both?
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-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too)  You've gotta be able to stop and steer before you can go fast! |
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10-06-2011, 08:03 PM
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#4 |
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Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: Smokes upon start-up ?
Valve guide seals typical problem w chevy
Add some marval mystery oil to crankcase n ill put money on it getting better shortley (my 90 smokes very little now) Posted via Mobile Device |
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10-06-2011, 09:30 PM
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#5 |
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Registered User
Join Date: Mar 2011
Location: Rogers, Ar.
Posts: 65
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Re: Smokes upon start-up ?
I think you're probably right about the valve guides, since it has almost 150,000 miles. I'll try some Marvel to get me by until the rebuild/replacement. Thanks !
__________________
'94 Chevy K1500 Ext.Cab/Short Z-71 4x4 350 TBI/4L60E (my tow rig)....and assorted other vehicles.
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10-06-2011, 09:35 PM
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#6 | |
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"Oh well, it's a driver."
Join Date: Jul 2008
Location: Nashville, TN
Posts: 3,467
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Re: Smokes upon start-up ?
+1 for valve guides. Mine does the same thing, after startup and even after I sit and idle at a stoplight. Changed the valve guide seals a couple years ago, but that didn't cure it; I think the guides themselves are just that worn. 190k on stock heads.
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- JB - '93 C1500 SHORT/FLEET SILVERADO, 350/4L60E Quote:
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10-09-2011, 10:18 PM
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#7 |
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Registered User
Join Date: Mar 2011
Location: Rogers, Ar.
Posts: 65
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Re: Smokes upon start-up ?
I added a bottle of Bardahl No Smoke and it's smoking much less. I guess it'll get me by until I rebuild the junkyard 1998 5.7 Vortec motor I plan to drop in someday. Thanks guys!
__________________
'94 Chevy K1500 Ext.Cab/Short Z-71 4x4 350 TBI/4L60E (my tow rig)....and assorted other vehicles.
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