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#1 |
Registered User
Join Date: Nov 2010
Location: Seattle, WA
Posts: 38
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Idle Issues
Disclaimer: Carbs are not my forte.
I'm slowly learning how to work on these things, I've got a '63 with original V6 and a brand new 2 barrel Holly that replaced the tired, old stromberg. At first it was running and idling great (last week), now the idle is throwing a tantrum. It's rough, doesn't want to stay running when it's cold, once the engine is proper warm it will usually stay running but it's still rough and periodically backfires up through the intake. But when the light turns green and you're giving it gas and moving through the gears it runs beautifully. I'm going to take a look at it tomorrow and see if I can't figure out whats going on with it. My guess is either the idle mixture screws need to be adjusted or the idle jet might have debris clogging it up. The old fuel filter (I think it was original) was the little glass cup the fuel would flow through, not sure how well it filtered out debris since it didn't actually have a filter. Anyway, I was planning on getting an in-line I just haven't gotten there yet. But I figure with the old gas tank it would probably be pretty easy for something to float it's way into the carb and plug it up somewhere. Given the issues, do those sound like feasible causes? |
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#2 | |
Registered User
Join Date: Sep 2012
Location: oceanside CA
Posts: 706
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Re: Idle Issues
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#3 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,641
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Re: Idle Issues
X2 on the need for a filter but leave the carb alone for now.
What's your initial timing? |
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#4 | |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Idle Issues
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__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#5 | |
Registered User
Join Date: Sep 2012
Location: oceanside CA
Posts: 706
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Re: Idle Issues
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#6 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Idle Issues
These engines have lasted as much as 500,000 so yes....very unlikely a tooth jumped. Especially Right when carbs were swapped. lol
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#7 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: Idle Issues
I always blame the points and condenser first unless they are new. Running dirty gas through a new carb isn't the best move either. I would still blame the points unless they are new.
__________________
76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#8 |
Registered User
Join Date: Sep 2012
Location: oceanside CA
Posts: 706
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Re: Idle Issues
Good point I just assumed it was a HEI. .. well you know what they say about assuming lol.
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#9 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Idle Issues
Unfortunately these never came from the factory with an HEI. Sucks cause they make a nice improvement. Though there is a guy who makes a direct swap one on ebay. Spendy though, but nothing but good reviews.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#10 |
Registered User
Join Date: Nov 2010
Location: Seattle, WA
Posts: 38
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Re: Idle Issues
Wow, been busy the last few days and haven't had a chance to check in here. Thanks for the info guys! So I richened the fuel mixture a little a few days ago and that helped, it's still a little rough, mostly while it's getting warmed up, but it holds an idle and still runs great when driving up and down through the gears. On fuel filters, I'm guessing I'm going to need someone to help me cut and flare the fuel lines in order to fit the fuel filter right? Any recommendations on fuel filters? I'm used to the clear plastic filters used on bikes, I like being able to monitor the fuel going through there.
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#11 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Idle Issues
I've used clear plastic filters several times. Since I know my system is clean I've now gone to the metal type. Feels safer. lol You can cut your line and use rubber hose and a filter.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#12 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: Idle Issues
Fram makes clear automotive fuel filters.
__________________
76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#13 |
Registered User
Join Date: Nov 2010
Location: Seattle, WA
Posts: 38
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Re: Idle Issues
She's running better now, in nosing around under the hood I also found a bad fuel line, don't know how I missed it before. The rubber hose that runs from the metal line underneath the engine up to the fuel pump. It was deteriorating to the point that it looked like one of those soaker hoses you buy for the garden. That's replaced with some brand new hose. Where would you guys recommend fitting the fuel filter? It would be easy to put it in the middle of that hose I just got, is it better to have it after the fuel pump though?
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#14 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Idle Issues
Since you have a stock pump it doesn't really matter. Anywhere that keeps the filter far enough from the exhaust manifolds.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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