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08-11-2016, 10:49 AM
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#1 |
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Senior Member
 
Join Date: Mar 2014
Location: Toano, VA
Posts: 893
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454 starting issues
Background info: original 84 454 BBC with an Edelbrock intake with a Holley 750 Double Pumper (mechanical choke), big cam but other than that rather stock.
Problem: the other day I had an issues driving where it would studder under acceleration just after shifting. It shut off down the road and I tried to start it again and it was backfiring through the carburetor (white smoke) and just wouldn't start. I advanced the dist a few degrees and it fired up. But it throws white smoke from the pipe after advanced, so I assume its getting okay spark because it does start, just doesnt run great. I cannot find out whats wrong. The main thing that gets me is that itll start good right after advancing the dist, but after that first start it doesn't start easy and will try to do a carb backfire again. and heres a pic of the 84 K30 just for fun.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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08-13-2016, 09:10 AM
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#2 |
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Active Member
Join Date: Jan 2005
Location: Spokane WA
Posts: 166
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Re: 454 starting issues
Bet the dist advance mechanism has never been taken apart cleaned and lubed!
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08-13-2016, 08:23 PM
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#3 |
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Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: 454 starting issues
White smoke equals coolant in the combustion chamber. So possibly intake/head gasket issue.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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08-13-2016, 11:39 PM
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#4 |
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Senior Member
Join Date: Mar 2014
Location: Toano, VA
Posts: 893
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Re: 454 starting issues
I think I found some of the issue. The 750 I have is rated for a big cam, ported head, giant exhaust drag car. Doesnt do well at idle and likes WOT better. I moved it down to a 600 I had in my basement and it fired up good and ran pretty good. In the morning I will tune it better and see how it does. It was truly flooding the motor with the 750.
__________________
"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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