![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Nov 2006
Location: Concord CA
Posts: 11
|
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
__________________
1992 4WD Suburban 350 CI/700R Trans. 1990 2WD Suburban 6.2L diesel/700R Trans. |
![]() |
![]() |
![]() |
#2 |
What Hump?
Join Date: Apr 2003
Location: New River AZ
Posts: 2,009
|
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
__________________
Lil red 86 c-10 99 Sub 78 Camper Special w/ 454 |
![]() |
![]() |
![]() |
#3 |
Registered User
![]() Join Date: Oct 2009
Location: SoCal
Posts: 815
|
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.
|
![]() |
![]() |
![]() |
#4 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
|
Re: New engine will not start
I agree. Your timing is not correct.
Posted via Mobile Device
__________________
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/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: May 2010
Location: Tahlequah, OK
Posts: 36
|
Re: New engine will not start
Check your valve lash. If its too tight it will cause those symtoms.
__________________
2016 GMC Sierra Double Cab 1986 GMC Sierra Classic SWB 1972 Chevy Cheyenne C20 4x4 Camper Special |
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Mar 2012
Location: harrisville, ms
Posts: 377
|
Re: New engine will not start
+1 your 180 out on your timing is what is sounds like
__________________
most people sleep peacfully at night because, rough men stand ready to do violenceon there behalf. |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Nov 2006
Location: Concord CA
Posts: 11
|
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.
__________________
1992 4WD Suburban 350 CI/700R Trans. 1990 2WD Suburban 6.2L diesel/700R Trans. |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jun 2010
Location: Vermontville, Mi
Posts: 80
|
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.
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Apr 2011
Location: Cleveland, Ohio
Posts: 293
|
Re: New engine will not start
Bad gas?
Posted via Mobile Device
__________________
1980 C10 SWB Yukon 5.3/5 speed 3.73 gears. |
![]() |
![]() |
![]() |
Bookmarks |
|
|