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#1 |
Registered User
Join Date: Sep 2012
Location: South Dakota
Posts: 6
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Starting/Running Problem
Ok so i just picked up a 70 C10 last week and its having some problems starting/running...Some insight, its a 350, has new fuel pump, fuel filter, plugs, wires, cap and rotor, and edelbrock 1406 carb, and a high rise wiend intake. Ok so heres the deal, if i jump into the pickup and go to fire it up after sitting for awhile it'll pop right off and run really good, but after driving it then parking it for a few minutes to an hour i'll go back out to fire it up and it'll pop off and run then if you dont romp on it it'll die then will not start up again at all no matter how much you crank on it...not even shooting starting fluid down the carb...yesterday i probably cranked on it for 20 minutes on and off till the battery died without it firing a single time...so i left the pickup over night and came back the next afternoon and it fired right up and ran perfectly fine, but driving down the road at a steady cruise it wanted to kinda cut out and when i stopped it wanted to die, but if you give it WOT it runs like a beast....got home let it sit for about 2 hours, go back out to start it, it fires up then dies and will not start again.....this is starting to piss me off...if anyone has any idea what could be causing this i'd surely like some insight. Thanks a lot.
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#2 |
Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,204
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Re: Starting/Running Problem
Sounds like a carb or timing problem...
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71 K20 64 GMC mud truck |
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#3 |
Registered User
Join Date: Sep 2012
Location: canoga park, ca.
Posts: 120
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Re: Starting/Running Problem
you need to check for spark, at least then you will know which direction your heading
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#4 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Starting/Running Problem
I agree, when that happens pull a plug wire and hold it close to the plug and see if spark jumps when cranking. Other than that, it sounds like you might have some settlements in the carb causing issues. http://www.edelbrock.com/automotive_...ech_vids.shtml
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,632
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Re: Starting/Running Problem
Fuel pressure too high!
Probably flooding a bit! |
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#6 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Starting/Running Problem
i would check the fire first, see if its firing when it not starting, may be some wiring problems inside the dist. if its hei ign...the module may be the problem or it's wiring, then if its ok....look for fuel problems...fuel psi.carb leaking inside, choke stuck...float level to high. or no fuel at all....
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#7 |
Registered User
Join Date: Sep 2012
Location: South Dakota
Posts: 6
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Re: Starting/Running Problem
Ok i'll check for spark next time it happens...and i drove it again today, it started perfect drove it around town and as soon as the engine started warming up it started dieing on me...and now its kind of dawning on me that it only starts dieing when it gets warm, runs perfect when you first start it and its cool...Im assuming that'd be in timing right?
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#8 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Starting/Running Problem
don't think you have a timing problem, if it starts ok then at least the timing is close...if the timing was to fast then it would kick back on the starter and drag the battery down kinda like a weak battery....if it's spinning the motor over ok then look elsewhere . i have seen several hei dist. when the vacuum moves the wires they cut out or stop making connection...broke wires that make contact when cold....warm...can be a real pain to locate some times....
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#9 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Starting/Running Problem
Are you running HEI? I am assuming that you are. Sometimes the coil under the cap of the distributor can fail after it gets hot and won't produce enough electricity to fire the engine. You need to narrow it down to whether or not it is electrical or fuel.
Before you fire it up when it is cold, pull the number 1 plug wire (doesn't matter which end). Then hold near the plug or cap where you pulled it, you should get a blue arc. When it fails to start, do the same. If you get a good blue arc of electricity, its not at your distributor/coil. But if there is none, or it is weak and yellowed arc you may have found your problem. If you are running points, your coil might be failing after it gets hot. If none of these are the issue, go to your fuel system and start trouble shooting it. As long as you are getting spark when it fail's, you should be able to eliminate the electrical side of the issue and move on to the fuel system.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#10 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,632
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Re: Starting/Running Problem
Next time you drive it and it dies look in the carb.
If you see or smell raw fuel it's flooding. Even a little bit will cause it to die. Look for vapours first too. Carry a small flashlight in the golvebox. Easier to see in there that way. |
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#11 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Starting/Running Problem
what type fuel pump?/edelbrock carbs are very senistive to pressure
sounds to me like the thing is floodind out and needs the plugs to dryout to refire
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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 |
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#12 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Starting/Running Problem
what type fuel pump?/edelbrock carbs are very senistive to pressure
sounds to me like the thing is flooding out and needs the plugs to dryout to refire// check the smell of your oil
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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 |
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#13 |
Registered User
![]() Join Date: Mar 2010
Location: tulsa,ok
Posts: 1,085
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Re: Starting/Running Problem
Sounds to me like the coil or module.
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MY BUILD THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=423629 1969 custom/10 swb--SOLD 1968 swb 50th anniv.--SOLD 1967 camaro ss/rs..LS-6-speed, 16-year long project 1956 chevy nomad 1955 chevy 210 2-dr sedan 1978 el-camino ss 1-owner |
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#14 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Starting/Running Problem
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#15 |
Registered User
Join Date: Sep 2012
Location: South Dakota
Posts: 6
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Re: Starting/Running Problem
It wouldn't start again so i checked for spark and sure enough it had no spark...so i replaced the distributor with one i knew was good and took it for a ride and sure enough its fixed then i lost a u-joint...fixed that, now my tranny wont shift into second...if its not one thing its another...But anyway thanks for all the help.
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#16 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Starting/Running Problem
Damn the luck! At least one thing is fixed. These trucks always keep a person busy.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#17 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Starting/Running Problem
if your trans, is a th350 or th400 check the vacuum line from the back by the dist. to the trans ....it may have fallen off when you changed the dist.out good luck...
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#18 |
Registered User
Join Date: Aug 2012
Location: Junction City, KS
Posts: 782
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Re: Starting/Running Problem
That vacuum line should run off the carb, the vacuum port on the driver side of the carb to the vacuum control module on the passenger side of the transmission. Hope it's an easy fix like that.
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Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust |
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#19 |
Registered User
Join Date: Sep 2012
Location: South Dakota
Posts: 6
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Re: Starting/Running Problem
The line is running into the back of the carb as it was before i ever worked on anything...and it did work after i switched the dist. just stopped shifting after i replaced the u-joint.
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#20 |
Registered User
Join Date: Sep 2003
Location: lebanon tn.
Posts: 96
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Got to add my 2 cents,check and make sure the vaccum line is still on modulator valve at tranny. Thanks Bobby
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36 master 36 master delux coupe,6cly,3sp. 58 impala,348 3 duces,4 sp. 56 belair,302,4sp,12 bolt. 2000 silverado,5.3 auto. 65 foo foo rd,352 auto,for sale |
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#21 |
Registered User
Join Date: Sep 2012
Location: South Dakota
Posts: 6
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Re: Starting/Running Problem
It is...i took the line completely off and made sure it was clean and not plugged and still no luck.
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#22 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Starting/Running Problem
if the line is o k and the hoses dont have any cracks...just replace the modulator , it may have give up the ghost....
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#23 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Starting/Running Problem
Run the HEI to full manifold vacumn (driver side port of carb)
Fuel pressure should not exceep 6psi 5.5 is ideal Floats should be set to spec (And carb tank filter etc should be clean working) What is your base timing or any of the timing set to? Need: Timing light fuel pressure guage Edelbrock fuel pump/fuel pressure regulator (edelbrock pump pre set to 5.5psi) OR A holle other type of carb thats not as sensitive to fuel psi Get your timing/fuel pressure and report back
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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