in need of help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bentleyjd · 12-16-2009, 05:05 AM

i have a 70 Chevy c-10 that i traded my Harley for about 4 months ago, and with my work hours and a baby on the way i really haven't been able to get into it much! as i drive it to the store and back ill try to get on it and see what shes got, but when do this it spurts real hard. i swapped the carb out tonight and was hoping this would fix this issue. well... i was wrong! it still does this "spurt" when i go to punch it! also after i have babied it up to speed for a while and go to come to a stop it will just die out on me if i cant slide it up into neutral quick enough! what is the deal ? why is it doing this? some one suggested the timing was off?? would that be the issue??

*72lb4x4* · 12-16-2009, 05:24 AM

I think we need a better description than spurts. Can you explain a bit more?

I guess it sounds funny when you get on it and doesn't make much power. Does it idle ok?

As a guess, try looking for blue sparks at night with the hood open by the plug wires and dist cap. Bad wires, cap, rotor, plugs. A tuneup may help.

Does it sneeze out the carb? Lean. Look for vacuum leaks.
Backfires from the exhaust? Timing?
Pull a few plugs and look at them.
Idle RPM varies? Maybe a clogged fuel filter or obstruction in the fuel system?

Just throwing a few things out there to be checked...

cdowns · 12-16-2009, 07:43 AM

get a full tuneup

**special-K** · 12-16-2009, 08:21 AM

Tune-up time fer sher.I`m thinking you mean it sputters,falls on it`s face,like it`s starved for fuel.It also could be a failing fuel pump.Either way,unless you know it just had a tune-up,it`s a great place to start.

That`s plugs,wires,cap,rotor,and points.I assume you looked at the air filter.A real bad dirty filter can rob enough air to do what you said.It would have to be reeeeeaalll dirty.

bentleyjd · 12-16-2009, 09:18 AM

i replaced the spark plugs and did a trans tune- up (filter and fluids) the wires looked good but im gonna change them. should have when i did the plugs

! the carb is good we pulled it off my buddys 72 c-10! i also changed the fuel filter too. the sound sounds like it sneezes if that makes any sense! like if i was to line up on a straight road and punch it it would " sneeze" as soon as i hit the peddle to the floor. but,however if i baby it into the gas she will roll smoothly down the road

cdowns · 12-16-2009, 10:27 AM

points gap or dwell is important part of tune up

bentleyjd · 12-16-2009, 10:32 AM

what is the gaping on a 350? just checking?

Shyguy · 12-16-2009, 11:54 AM

It never hurts to put a good gasoline additive in the tank and see if that helps after doing the tune-up and filter change. Sea Foam is good or Lucas.

Their could be a problem with vacuum.

Look in the distributor and make sure every thing that is supposed to move is not froze up with rust.

Just a few ideas.

Danny

PanelDeland · 12-16-2009, 06:58 PM

Might also check to see if the vacuum advance is working.It will make it act like the timing is off.

bentleyjd · 12-16-2009, 08:33 PM

i think i might run down and get it timed to see if that helps. i put a new fuel filter on today and no change ! figured id start small and cheap! also when it "sneezes" there is a strong smell of gas afterward if that would help diagnose anything !

bentleyjd · 12-16-2009, 08:34 PM

what is the gaping on the plugs for a 350?

71meangreenc10 · 12-16-2009, 08:48 PM

Also you might want to see if your tank is rusted and sending crap up to the carb, been there done that, new tank and lines, cleaned out the carb and it runs like a champ now.

Smitty

mikajo39 · 12-16-2009, 08:52 PM

Quote:

Originally Posted by bentleyjd

what is the gaping on the plugs for a 350?

stock with points? .035"
HEI .045"

bentleyjd · 12-17-2009, 07:09 AM

this is possibly a stupid question but dont know so i'll ask! would it being bored 30 over change the gaping?

**Roland** · 12-17-2009, 07:47 AM

You can have the timing just right (at idle), clean gas, plugs gapped properly and all new wires and if the advance mechanism (vacuum or centrifigal) isn't working it will make 'em sneeze when you stomp the accelerator. If you have replaced points and condenser, etc, make sure the condenser is not screwed down in a position to interfere with the advance.

AirSpeed · 12-18-2009, 03:34 AM

My 69 does this when it sits in the rain for a day or two. I tried everything with no luck until one day I noticed the distributor cap was wet, I popped it off and it was full of water. I wiped it out, put it back on and it ran perfect.

bentleyjd · 12-18-2009, 07:33 AM

how did the water get in there? was it just moisture build up or... im scared to get to far into taking the distributor apart cause im afraid it wont make it back together right!! im gonna run it down the road today and try to get the timing looked at and ill have him check the distributor as well! thanks for the good leads and tips I'll keep y'all posted

**special-K** · 12-18-2009, 07:47 AM

I your distributor cap was allowing moisture you`d have carbon tracks and it would run rough at all speeds.It sounds like it`s not getting the spark it needs when advance matters.I believe either the timing is off or it`s not advancing.This may cost nothing to fix.

mrein3 · 12-18-2009, 08:47 AM

Depending on how neglected this truck was before you got it it may just have furry contacts under the distributor cap.

Take it off and peek under there. If the contacts are furry you can get by with scraping them clean with your pocket knife. If that fixes the problem go get a new, quality cap and replace it.

12-16-2009, 05:05 AM	#1
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	in need of help! i have a 70 Chevy c-10 that i traded my Harley for about 4 months ago, and with my work hours and a baby on the way i really haven't been able to get into it much! as i drive it to the store and back ill try to get on it and see what shes got, but when do this it spurts real hard. i swapped the carb out tonight and was hoping this would fix this issue. well... i was wrong! it still does this "spurt" when i go to punch it! also after i have babied it up to speed for a while and go to come to a stop it will just die out on me if i cant slide it up into neutral quick enough! what is the deal ? why is it doing this? some one suggested the timing was off?? would that be the issue??

12-16-2009, 05:24 AM	#2
72lb4x4 Account Suspended Join Date: Jul 2006 Location: DFW Posts: 1,427	Re: in need of help! I think we need a better description than spurts. Can you explain a bit more? I guess it sounds funny when you get on it and doesn't make much power. Does it idle ok? As a guess, try looking for blue sparks at night with the hood open by the plug wires and dist cap. Bad wires, cap, rotor, plugs. A tuneup may help. Does it sneeze out the carb? Lean. Look for vacuum leaks. Backfires from the exhaust? Timing? Pull a few plugs and look at them. Idle RPM varies? Maybe a clogged fuel filter or obstruction in the fuel system? Just throwing a few things out there to be checked...

12-16-2009, 07:43 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: in need of help! get a full tuneup __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-16-2009, 08:21 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: in need of help! Tune-up time fer sher.I`m thinking you mean it sputters,falls on it`s face,like it`s starved for fuel.It also could be a failing fuel pump.Either way,unless you know it just had a tune-up,it`s a great place to start. That`s plugs,wires,cap,rotor,and points.I assume you looked at the air filter.A real bad dirty filter can rob enough air to do what you said.It would have to be reeeeeaalll dirty. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 12-16-2009 at 08:27 AM.

12-16-2009, 09:18 AM	#5
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! i replaced the spark plugs and did a trans tune- up (filter and fluids) the wires looked good but im gonna change them. should have when i did the plugs! the carb is good we pulled it off my buddys 72 c-10! i also changed the fuel filter too. the sound sounds like it sneezes if that makes any sense! like if i was to line up on a straight road and punch it it would " sneeze" as soon as i hit the peddle to the floor. but,however if i baby it into the gas she will roll smoothly down the road

12-16-2009, 10:27 AM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: in need of help! points gap or dwell is important part of tune up __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-16-2009, 10:32 AM	#7
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! what is the gaping on a 350? just checking?

12-16-2009, 11:54 AM	#8
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: in need of help! It never hurts to put a good gasoline additive in the tank and see if that helps after doing the tune-up and filter change. Sea Foam is good or Lucas. Their could be a problem with vacuum. Look in the distributor and make sure every thing that is supposed to move is not froze up with rust. Just a few ideas. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

12-16-2009, 06:58 PM	#9
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: in need of help! Might also check to see if the vacuum advance is working.It will make it act like the timing is off. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

12-16-2009, 08:33 PM	#10
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! i think i might run down and get it timed to see if that helps. i put a new fuel filter on today and no change ! figured id start small and cheap! also when it "sneezes" there is a strong smell of gas afterward if that would help diagnose anything ! __________________ 1972 chevy c\10 350 bored 30 over w\radical cam. 373 gears

12-16-2009, 08:34 PM	#11
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! what is the gaping on the plugs for a 350? __________________ 1972 chevy c\10 350 bored 30 over w\radical cam. 373 gears

12-16-2009, 08:48 PM	#12
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: in need of help! Also you might want to see if your tank is rusted and sending crap up to the carb, been there done that, new tank and lines, cleaned out the carb and it runs like a champ now. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

12-17-2009, 07:09 AM	#14
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! this is possibly a stupid question but dont know so i'll ask! would it being bored 30 over change the gaping? __________________ 1972 chevy c\10 350 bored 30 over w\radical cam. 373 gears

12-17-2009, 07:47 AM	#15
Roland Junior Member Join Date: Nov 2006 Location: Brandon, MS Posts: 134	Re: in need of help! You can have the timing just right (at idle), clean gas, plugs gapped properly and all new wires and if the advance mechanism (vacuum or centrifigal) isn't working it will make 'em sneeze when you stomp the accelerator. If you have replaced points and condenser, etc, make sure the condenser is not screwed down in a position to interfere with the advance. Last edited by Roland; 12-17-2009 at 07:48 AM. Reason: extra letter

12-18-2009, 03:34 AM	#16
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: in need of help! My 69 does this when it sits in the rain for a day or two. I tried everything with no luck until one day I noticed the distributor cap was wet, I popped it off and it was full of water. I wiped it out, put it back on and it ran perfect.



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12-18-2009, 07:33 AM	#17
bentleyjd Registered User Join Date: Dec 2009 Location: ray city ga Posts: 8	Re: in need of help! how did the water get in there? was it just moisture build up or... im scared to get to far into taking the distributor apart cause im afraid it wont make it back together right!! im gonna run it down the road today and try to get the timing looked at and ill have him check the distributor as well! thanks for the good leads and tips I'll keep y'all posted __________________ 1972 chevy c\10 350 bored 30 over w\radical cam. 373 gears

12-18-2009, 07:47 AM	#18
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: in need of help! I your distributor cap was allowing moisture you`d have carbon tracks and it would run rough at all speeds.It sounds like it`s not getting the spark it needs when advance matters.I believe either the timing is off or it`s not advancing.This may cost nothing to fix. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-18-2009, 08:47 AM	#19
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	Re: in need of help! Depending on how neglected this truck was before you got it it may just have furry contacts under the distributor cap. Take it off and peek under there. If the contacts are furry you can get by with scraping them clean with your pocket knife. If that fixes the problem go get a new, quality cap and replace it. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

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