help please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85c10tx · 05-08-2011, 12:57 AM

Hi im new to this forum i have a 1985 chevy c10 that im having issues with. It has a 350 with a holley 650cfm carb with long tube headers and a edelbrock intake. my truck starts fine it idles high at first an then when i stop some where and cut the truck off and start it up again it barely idles like if it has no gas . also it just cuts off when i put in drive or reverse.the trans is a th350 thanks in advance im kind of new to these trucks.Any help is appreciated.

**N2TRUX** · 05-08-2011, 12:00 PM

Welcome to the forum 85c10tx. Sounds like fuel issues. Maybe someone else can offer advice that has a better understanding of Holley carbs.

85c10tx · 05-08-2011, 01:40 PM

thanks and thank you for the your help...

lindstromjd · 05-09-2011, 03:42 PM

Sounds to me like the mixture screws aren't out enough. Since it runs at high idle when you first start, your choke is working properly, but the carb doesn't have enough fuel supply going through it to keep the engine running under a load once it's warmed up.

85c10tx · 05-09-2011, 07:18 PM

thanks for the help. the screws are out pretty far thats how i got it to come on when this started. now it doesnt help until it cools back down.

makman1297 · 05-09-2011, 07:50 PM

Your carb could be partially plugged up internally. Did you check for any vacuum leaks. I had a problem with my edelbrock that idled high and when you put it in gear it would almost stall, and sometimes die when coasting to a stop sign. I had to rebuild the carb, and adjust the timing and fix a vaccum leak. It runs like a champ now. Good luck.

85c10tx · 05-09-2011, 08:27 PM

thanks and yeah i checked for vacuum leaks and i couldnt find any. i think im going to rebuild the carb just to make sure.

**old Rusty C10** · 05-09-2011, 08:54 PM

i had an issue like that with mine and it needed a rebuild.... but for kicks check your fuel filter first

meme1911 · 05-10-2011, 09:57 AM

I had similar symptoms in my truck, check the fuel mixture and adjust the distributor spark time through ...... worked for me

MC

motornut · 05-10-2011, 10:57 AM

maybe check for vac leaks on your brakes/booster
thinking brakes would be on when shifting to drive?
I'm gona be checking mine cause my revs drop down quite a bit when applied
(but not stalling)600/700rpm
seems more so ,with getting warmer out now

85c10tx · 05-11-2011, 06:43 PM

Thanks all im going to get it timed and carb rebuilt this weekend . I appreciate all your insight.

05-08-2011, 12:57 AM	#1
85c10tx Registered User Join Date: Feb 2011 Location: houston tx Posts: 23	help please Hi im new to this forum i have a 1985 chevy c10 that im having issues with. It has a 350 with a holley 650cfm carb with long tube headers and a edelbrock intake. my truck starts fine it idles high at first an then when i stop some where and cut the truck off and start it up again it barely idles like if it has no gas . also it just cuts off when i put in drive or reverse.the trans is a th350 thanks in advance im kind of new to these trucks.Any help is appreciated.

05-08-2011, 12:00 PM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: help please Welcome to the forum 85c10tx. Sounds like fuel issues. Maybe someone else can offer advice that has a better understanding of Holley carbs. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

05-08-2011, 01:40 PM	#3
85c10tx Registered User Join Date: Feb 2011 Location: houston tx Posts: 23	Re: help please thanks and thank you for the your help...

05-09-2011, 03:42 PM	#4
lindstromjd Gentleman Jim owner x2 Join Date: Oct 2010 Location: West Des Moines, IA Posts: 464	Re: help please Sounds to me like the mixture screws aren't out enough. Since it runs at high idle when you first start, your choke is working properly, but the carb doesn't have enough fuel supply going through it to keep the engine running under a load once it's warmed up. __________________ 1975 GMC Gentleman Jim #1 -357 / 700r4 1975 GMC Gentleman Jim #2 -350 / TH350

05-09-2011, 07:18 PM	#5
85c10tx Registered User Join Date: Feb 2011 Location: houston tx Posts: 23	Re: help please thanks for the help. the screws are out pretty far thats how i got it to come on when this started. now it doesnt help until it cools back down.

05-09-2011, 07:50 PM	#6
makman1297 Registered User Join Date: Mar 2010 Location: Beaufort SC Posts: 583	Re: help please Your carb could be partially plugged up internally. Did you check for any vacuum leaks. I had a problem with my edelbrock that idled high and when you put it in gear it would almost stall, and sometimes die when coasting to a stop sign. I had to rebuild the carb, and adjust the timing and fix a vaccum leak. It runs like a champ now. Good luck.

05-09-2011, 08:27 PM	#7
85c10tx Registered User Join Date: Feb 2011 Location: houston tx Posts: 23	Re: help please thanks and yeah i checked for vacuum leaks and i couldnt find any. i think im going to rebuild the carb just to make sure.

05-09-2011, 08:54 PM	#8
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	Re: help please i had an issue like that with mine and it needed a rebuild.... but for kicks check your fuel filter first __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-10-2011, 09:57 AM	#9
meme1911 Registered User Join Date: May 2011 Location: monterrey Posts: 12	Re: help please I had similar symptoms in my truck, check the fuel mixture and adjust the distributor spark time through ...... worked for me MC

05-10-2011, 10:57 AM	#10
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: help please maybe check for vac leaks on your brakes/booster thinking brakes would be on when shifting to drive? I'm gona be checking mine cause my revs drop down quite a bit when applied (but not stalling)600/700rpm seems more so ,with getting warmer out now __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

05-11-2011, 06:43 PM	#11
85c10tx Registered User Join Date: Feb 2011 Location: houston tx Posts: 23	Re: help please Thanks all im going to get it timed and carb rebuilt this weekend . I appreciate all your insight.



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