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05-23-2012, 12:54 AM
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#1 |
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Registered User
Join Date: Nov 2006
Location: Concord CA
Posts: 11
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New engine will not start
I have a new 383 engine that will only start at 1/2 throtttle and bearly runs for a few seconds, it miss fires and sends out black smoke. It seems to be not firing on all cylinders. the timing is right and all parts are new. it has a Holley double pumper carb. any ideas?
Thanks
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1992 4WD Suburban 350 CI/700R Trans. 1990 2WD Suburban 6.2L diesel/700R Trans. |
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05-23-2012, 01:48 AM
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#2 |
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What Hump?
Join Date: Apr 2003
Location: New River AZ
Posts: 2,009
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Re: New engine will not start
You say the timing is set right, may want to turn your distributor 180 degrees and see if it still acts up
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Lil red 86 c-10 99 Sub 78 Camper Special w/ 454 |
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05-23-2012, 01:47 PM
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#3 |
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Registered User
 
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Re: New engine will not start
Double check your ignition, vacuum, and fuel pump. Pull out #1 plug get it top dead center then pull off dist. cap and see if its pointing at cylinder #1. it sounds like your 180 off like Eyegore said.
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05-23-2012, 03:21 PM
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#4 |
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Just here to tinker
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: New engine will not start
I agree. Your timing is not correct.
Posted via Mobile Device
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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05-23-2012, 05:12 PM
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#5 |
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Registered User
Join Date: May 2010
Location: Tahlequah, OK
Posts: 36
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Re: New engine will not start
Check your valve lash. If its too tight it will cause those symtoms.
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2016 GMC Sierra Double Cab 1986 GMC Sierra Classic SWB 1972 Chevy Cheyenne C20 4x4 Camper Special |
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05-23-2012, 07:29 PM
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#6 |
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Registered User
Join Date: Mar 2012
Location: harrisville, ms
Posts: 377
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Re: New engine will not start
+1 your 180 out on your timing is what is sounds like
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most people sleep peacfully at night because, rough men stand ready to do violenceon there behalf. |
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05-23-2012, 10:08 PM
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#7 |
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Registered User
Join Date: Nov 2006
Location: Concord CA
Posts: 11
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Re: New engine will not start
I used a timing light when cranking the motor over and the # 1 is firing at the right time and I think if the timing is out 180 degrees it would not idle at all. I know these engines are not rocket science, I'm thinking now the valve timing or clearance is wrong. I had a machinist assemble the beast.
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1992 4WD Suburban 350 CI/700R Trans. 1990 2WD Suburban 6.2L diesel/700R Trans. |
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05-24-2012, 07:08 AM
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#8 |
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Registered User
Join Date: Jun 2010
Location: Vermontville, Mi
Posts: 80
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Re: New engine will not start
Power valve. Common on some Holley carbs. A backfire will blow them out if they don't have the kit installed.
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05-24-2012, 08:39 AM
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#9 |
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Registered User
Join Date: Apr 2011
Location: Cleveland, Ohio
Posts: 293
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Re: New engine will not start
Bad gas?
Posted via Mobile Device
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1980 C10 SWB Yukon 5.3/5 speed 3.73 gears. |
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