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#1 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Idle issue with 63 chevy
Ill try to be as detailed as possible,I'm no mechanic, but have been around old piles of crap all my life
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#2 |
Registered User
Join Date: Nov 2009
Location: Galt, Calif
Posts: 2,437
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Re: Idle issue with 63 chevy
Have you ever rebuilt the carb, check the gas filter, you have one I`m assuming, start with a ne w fuel filter, then get back to us....
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`64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip |
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#3 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
Thanks for the reply, the carb was installed new less than a year ago, I changed the filter then, not to say it hasn't gotten clogged up tho, I'll check it out
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#4 |
Registered User
Join Date: Nov 2009
Location: Galt, Calif
Posts: 2,437
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Re: Idle issue with 63 chevy
When you remove your filter, before you install the new one crank the engine over with the fuel line open into a container, two reasons check condition of fuel pump and clear out any debris that might be in there, into a container you can see in. There may be junk in the tank, clogged sock ( screen on the line in the tank )...
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`64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip |
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#5 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
When tuning idle A/F mix screw I turn screw CW till idle gets rough.
I mark mix screws w/ white out at leanest smooth idle. Then I turn CCW till rough idle and note how many turns from lean idle to rich idle. I usually idle near lean limit and I run coldest plug engine will tolerate. I would pull some plugs and make sure they are correct color; near white to tan w/o deposits. I would do a quick linkage binding check. |
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#6 | ||
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
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#7 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: Idle issue with 63 chevy
Bump your timing back the other way. Try 12* to start. Hook your vac advance to manifold vacuum. Idle will speed up. Turn down idle as low as possible then adjust mixture screws.
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#8 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
Some carbs can have out of the blue problems if they sit long enough for gas to go bad.
Autolite 4 BBL and Stromberg 2 BBL can sit a couple years w/o problem. My new Edelbrock sat a couple years and it gave me a fit tuning idle. After sufficient hair pulling I rebuilt it and it's has worked perfect ever since. Does it smell rich when misbehaving? |
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#9 | ||
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
Quote:
Quote:
First thing today I changed the fuel filter, fuel pump appears to be in good working order. Fired it up and greeted with a rough idle after it warms up, again I fatten up the mixture and it smooths out. After I got it to idle I adjusted the timing readjusted the mixture and test drove it pretty hard, it runs good and strong, no hiccups or hesitations, rattles, pings, has no problem breaking the tires loose or pulling to 6000rpm. Keep in mind I did this same routine last night, Just to have do it again today, eventually the screws will back all the way out? Lol. I guess I'll try again in the morning and see if it happens to stay "fixed" this time. Here is a pic of a plug pic is bad but it's near white, electrode is tan ![]() Posted via Mobile Device |
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#10 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: Idle issue with 63 chevy
If it surged when you went to manifold vacuum it might mean you have too much timing added with the vacuum pot. Run whatever your motor likes.
The mixture screws shouldn't back out. Do you still have the tension springs on them? Your plug looks alright. |
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#11 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
I thought about that and once I get this squared away ill try the manifold vacuum and tune the advance to see if it performs better, drivability is good as is but economy isn't great. I was half joking about the screws backing out, meaning if I have to adjust every time I start it eventually ill be out of room to adjust. <--I know that isn't an option. I appreciate your help and advice, if this persists tomorrow ill update again. Thanks to all!
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#12 |
Registered User
Join Date: Nov 2009
Location: Galt, Calif
Posts: 2,437
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Re: Idle issue with 63 chevy
You might want to check for a vaccum leak, a can of carb cleaner shoot at the base of the carb, maybe just check carb bolts for tightness, and or manifold leak, hose leak to dizzy or booster if you have power brakes.
__________________
`64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip |
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#13 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
Your plug looks great.
Keep in mind plug color can change. Plug can be black after rich idle but turn white again after lean cruise. I'd pull one plug after next time it idles bad to make sure idle isn't rich. If you over advance timing you can destroy engine in a heart beat. 6000 rpms is starting to get scary because you are stress testing engines quality and design. My engine is designed for 6500rpm but I'm not brave enough to test. Check all in timing at about 2500-3000rpm to make sure it does not go above design; many street engines like all in timing of 32 to 38. |
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#14 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
Bad PCV can cause out of the blue crappy idle.
While checking PCV I like to check the hoses as well. I don't remember if you verified choke is full open. |
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#15 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
That plug was after a long idle, after getting it running smooth. I should have noted I first thought vacuum leak and sprayed it with wd40 while running. And verified choke was open..
Total advance is 42 in @ 3000, it doesn't ping or rattle so I figured I'm ok there, but can see limiting the vacuum advance wouldn't be a horrible idea. I admit I beat on the old girl harder than I should, all projects in the past have been on the ragged edge of streetability and this is my first effort at a solid driver, and well....some habits are hard to break ![]() Back to today it crunk up fine and after warming up, had a good idle and was drivable, so it either just randomly needed adjusting two days in a row, or it fixed itself, or its gonna show up again at some point, I know what I expect to happen Posted via Mobile Device |
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#16 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
42 advance is pretty aggressive.
I'd like to beat on mine but don't wanna risk any more projects. If I had Leno's mechanics it'd be a different story. Any chance you got a tank of bad gas? |
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#17 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
It's very possible, I did fill up the last time out. Keeping fingers crossed at this point. I appreciate your help/advice
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#18 |
Registered User
Join Date: Jun 2006
Location: Jackson, Mo.
Posts: 607
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Re: Idle issue with 63 chevy
One other thing to think about, which may or may not be causing you trouble, is the fact that the Edelbrock carbs can't tolerate as much fuel pressure as, say, a Holley can. I found this out the hard way on my son's '65, as it had a rich idle issue that I couldn't tune out of it. After doing some research on Edelbrock carbs, I learned that they are calibrated to run with no more than about 5-5 1/2 lbs. of pressure. The stock mechanical pump was putting out between 7-8 lbs. at idle, so I threw a Holley blue regulator on it, backed the pressure down to 5 lbs., and then it was responsive to idle screw adjustments. Like I said, this may not be an issue for you, but it's something to keep in mind.
Good luck with yours!
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Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver |
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#19 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
Quote:
While setting float it is good to inspect condition of shutoff valve. |
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#20 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
Nxtruck that is the best avatar on this site! Your truck looks awesome with the wheels up! I drove this thing around a bit today and its running good now....I don't know? Ill just be keeping a screw driver in the truck for a while
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#21 |
Registered User
Join Date: Jun 2006
Location: Jackson, Mo.
Posts: 607
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Re: Idle issue with 63 chevy
Thanks for the compliment! Glad to hear yours is running good now. Maybe a load of bad gas?
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Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver |
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#22 |
Registered User
Join Date: Mar 2011
Location: Hollister, Ca
Posts: 178
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Re: Idle issue with 63 chevy
My 235 had a bad problem with this for a while. It turned out that the HEI I had needed a rebuild. How old is your HEI?
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#23 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Idle issue with 63 chevy
Quote:
I'm still running points in 2 other engines. Pretty sure points weren't changed for over 20 years in the truck. The points tend to be reliable for decades in low mileage applications. Cool thing is you can keep $5.00 spare points/condenser in the glove box. I'd go electronic for >5000 rpm performance application. |
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#24 | |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: Idle issue with 63 chevy
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