Help! Truck won't stay running - The 1947 - Present Chevrolet & GMC Truck Message Board Network

c10chevy69 · 01-24-2006, 07:29 PM

The truck was running fine last week but it started coughing and sputtering then died. I tried to start it a few times but nothing. Had it towed home and replaced the fuel pump but didn't help. The engine turns over and sounds like it wants to start but dies right away. It's a 350 with an Edelbrock 1405. It did backfire through the exhaust after the last try. Then I quit trying. Any suggestions?

Solver · 01-24-2006, 07:42 PM

I would dump some gas down the carb and see if it runs for a little while. If not then fuel is your problem. Maybe fuel filter in carb. If it runs for a little while once you dump the fuel then it has to be spark problem.

cdowns · 01-24-2006, 07:51 PM

points, plugs ,condensor,distributor cap,sparkplug wires, gas and fuel filters// set dwell, gap ,timing // it's called a tuneup then see where you're at // old vehicles need these items looked at on a frequent basis to stay in proper running condition

Frizzle Fry · 01-24-2006, 08:04 PM

Quote:

Originally Posted by Solver

I would dump some gas down the carb and see if it runs for a little while. If not then fuel is your problem. Maybe fuel filter in carb. If it runs for a little while once you dump the fuel then it has to be spark problem.

I think you have that backwards.: If you spray fuel or started fluid down the carb and it runs momentarily that indicates a fuel delivery issue and the ignition is OK. If it won't fire with starter fluid or fuel sprayed in there, you likely have an ignition issue.

Could also be a vacuum leak in the carb or manifold. Check all fittings, ports, and lines to/from those.

Longhorn Man · 01-24-2006, 08:59 PM

Do you still have the old points ignition system?

c10chevy69 · 01-24-2006, 09:13 PM

It's HEI. Thank you cdowns I am aware of a tuneup.

I did one a few months and replaced the plug wires.

cdowns · 01-24-2006, 10:11 PM

with gas line disconnected from carb going into a container if you crank for 15seconds you should get a little over a cup of gas if not fuel supply prob either bad pump or clogged tank strainer

hei ??was a new wire run for power?? if not cause could be burned up module due to lo voltage another common prob with hei is bad module ground//take a plug out ground to engine and turnover and check for spark

Solver · 01-24-2006, 10:58 PM

Frizzle you are right . I just re read my post and do have it backwards. Just got home from work when I posted and was still alittle brain dead! Oh well !

boogie67 · 01-24-2006, 11:10 PM

check your plugs they could be wet.TO much gas thats what happen to mine.
I changed the plugs cranked right up.

kq4pc · 01-24-2006, 11:20 PM

Hello all, tought i would put my 2 cents in.i had a truck ,started and ran good everytime i tryed it.i had a guy wanting to buy it,he came to look at the truck.would not hit a lick.i changed the iginition module in dist.started and ran great.might try that. Bobby

blazerparts · 01-24-2006, 11:38 PM

I just had to change a hei coil and module.

cdowns · 01-25-2006, 12:16 AM

another thing if you have a tachometer it could be the promlem /disconnect the tach lead from the dizz

Steelawork'n · 01-25-2006, 01:17 AM

Yeah, check the cap and rotor. I went to (if I remember right) a 12g wire for power...not direct though, it goes through the ignition switch. Vacuum leaks can also cause flame outs but not failure to fires.

*Pi · 01-25-2006, 10:24 AM

To offer an option
Sounds like it might be a slack timming chain that has jumped a tooth maybe.....

*Pi

roughedup72 · 01-25-2006, 12:04 PM

Everybody seems to say the same thing so just be careful of the backfires, they tend to let your vehicle catch fire that way. You may want to check the power wire where it connects to your dizzy.It could have come loose. Good luck.

jhow66 · 01-25-2006, 12:24 PM

Carb is flooding on you. Remove all plugs and see if they are wet. If wet crank engine over to clean out cylinders of raw gas. Install new plugs. Disconnect fuel line on tank side of pump. If it starts let it run until it uses all gas in carb. Reconnect fuel line. If there was a piece of dirt under one of your float needles the on rushing gas should wash it out (if you are lucky). If not luckly remove top of carb and clean needle seats.
(above advice carries no written warrenty)

01-24-2006, 07:29 PM	#1
c10chevy69 Registered User Join Date: May 2004 Location: Oklahoma City Posts: 205	Help! Truck won't stay running The truck was running fine last week but it started coughing and sputtering then died. I tried to start it a few times but nothing. Had it towed home and replaced the fuel pump but didn't help. The engine turns over and sounds like it wants to start but dies right away. It's a 350 with an Edelbrock 1405. It did backfire through the exhaust after the last try. Then I quit trying. Any suggestions? __________________ 1969 chevy C10 long bed 350 4bbl auto p/disc and 5 lug

01-24-2006, 07:42 PM	#2
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Help! Truck won't stay running I would dump some gas down the carb and see if it runs for a little while. If not then fuel is your problem. Maybe fuel filter in carb. If it runs for a little while once you dump the fuel then it has to be spark problem. __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

01-24-2006, 07:51 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Help! Truck won't stay running points, plugs ,condensor,distributor cap,sparkplug wires, gas and fuel filters// set dwell, gap ,timing // it's called a tuneup then see where you're at // old vehicles need these items looked at on a frequent basis to stay in proper running condition __________________ 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

01-24-2006, 08:59 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Help! Truck won't stay running Do you still have the old points ignition system?

01-24-2006, 09:13 PM	#6
c10chevy69 Registered User Join Date: May 2004 Location: Oklahoma City Posts: 205	Re: Help! Truck won't stay running It's HEI. Thank you cdowns I am aware of a tuneup. I did one a few months and replaced the plug wires. __________________ 1969 chevy C10 long bed 350 4bbl auto p/disc and 5 lug

01-24-2006, 10:11 PM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Help! Truck won't stay running with gas line disconnected from carb going into a container if you crank for 15seconds you should get a little over a cup of gas if not fuel supply prob either bad pump or clogged tank strainer hei ??was a new wire run for power?? if not cause could be burned up module due to lo voltage another common prob with hei is bad module ground//take a plug out ground to engine and turnover and check for spark __________________ 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

01-24-2006, 10:58 PM	#8
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Help! Truck won't stay running Frizzle you are right . I just re read my post and do have it backwards. Just got home from work when I posted and was still alittle brain dead! Oh well ! __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

01-24-2006, 11:10 PM	#9
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	Re: Help! Truck won't stay running check your plugs they could be wet.TO much gas thats what happen to mine. I changed the plugs cranked right up. __________________ 77 swb starting all over again.

01-24-2006, 11:20 PM	#10
kq4pc Registered User Join Date: Sep 2003 Location: lebanon tn. Posts: 96	Re: Help! Truck won't stay running Hello all, tought i would put my 2 cents in.i had a truck ,started and ran good everytime i tryed it.i had a guy wanting to buy it,he came to look at the truck.would not hit a lick.i changed the iginition module in dist.started and ran great.might try that. Bobby __________________ 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

01-24-2006, 11:38 PM	#11
blazerparts No,I DON'T have Tourett's Join Date: Mar 2005 Location: Reno, NV Posts: 556	Re: Help! Truck won't stay running I just had to change a hei coil and module. __________________ '72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater

01-25-2006, 12:16 AM	#12
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Help! Truck won't stay running another thing if you have a tachometer it could be the promlem /disconnect the tach lead from the dizz __________________ 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

01-25-2006, 01:17 AM	#13
Steelawork'n Just hang'n around Join Date: Nov 2005 Location: Camano Island WA Posts: 248	Re: Help! Truck won't stay running Yeah, check the cap and rotor. I went to (if I remember right) a 12g wire for power...not direct though, it goes through the ignition switch. Vacuum leaks can also cause flame outs but not failure to fires. __________________ Driving a '68 Chevy C20 and a '93 Astro Van. Lots and lots of mileage that I deduct each year.

01-25-2006, 10:24 AM	#14
*Pi Registered User Join Date: Jan 2006 Location: Texas Posts: 1	Re: Help! Truck won't stay running To offer an option Sounds like it might be a slack timming chain that has jumped a tooth maybe..... *Pi

01-25-2006, 12:04 PM	#15
roughedup72 Senior Member Join Date: Oct 2005 Location: south carolina Posts: 658	Re: Help! Truck won't stay running Everybody seems to say the same thing so just be careful of the backfires, they tend to let your vehicle catch fire that way. You may want to check the power wire where it connects to your dizzy.It could have come loose. Good luck. __________________ 1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod.

01-25-2006, 12:24 PM	#16
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Help! Truck won't stay running Carb is flooding on you. Remove all plugs and see if they are wet. If wet crank engine over to clean out cylinders of raw gas. Install new plugs. Disconnect fuel line on tank side of pump. If it starts let it run until it uses all gas in carb. Reconnect fuel line. If there was a piece of dirt under one of your float needles the on rushing gas should wash it out (if you are lucky). If not luckly remove top of carb and clean needle seats. (above advice carries no written warrenty) __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer



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