Excessive cranking 86 Chevy

dreambig73 · 06-28-2007, 01:32 PM

My truck is a 86 P/U with a 350 (not original, probably from a van a year or two newer) carb, HEI. When I try to start it cold a lot of times it will almost start then die. Then I try to start again and it wants to crank for 5-10 seconds while I pump the throttle. Once it starts it runs fine. Sometimes it even takes a few seconds to start it hot. What could cause this? Maybe needs a tune up? The carb was just adjusted over the winter.

mrjohnwayne · 06-28-2007, 01:50 PM

could probably use a tune up. Timing might be a little to far advanced. Might want to give it a check.

Ford4x4Chik27 · 06-28-2007, 02:52 PM

I'd say timing or spark. But it could be one of a million things really.

dreambig73 · 06-28-2007, 04:53 PM

Thanks. I'll start with checking the timing. I figure it needs a t/u anyway.

75K30 · 06-28-2007, 09:44 PM

Sounds to me more like the fuel pump bud. If the diaghram is bad, or leaking, it will not hold pressure and allow the fuel bowl to drain. Once the bowl is empty, it takes a while to crank until it fills again. Once it does, she runs fine. It mat even run, and start well untill it sits for a while and the fuel drains back out of the bowl.
You could change the mechanical pump, or install an electric one, and a regulator. The easiest is to just install a new pump. SBC pumps are a dime a dozen. Two bolts and presto, thing should start every time.

03chevy · 06-29-2007, 06:37 AM

i would say more of a fuel pump problem instead of a tuneup problem unless it has been a long time ago for a tuneup

06-28-2007, 01:32 PM	#1
dreambig73 Full Member Join Date: Feb 2007 Location: Grand Rapids, MI Posts: 9	Excessive cranking 86 Chevy My truck is a 86 P/U with a 350 (not original, probably from a van a year or two newer) carb, HEI. When I try to start it cold a lot of times it will almost start then die. Then I try to start again and it wants to crank for 5-10 seconds while I pump the throttle. Once it starts it runs fine. Sometimes it even takes a few seconds to start it hot. What could cause this? Maybe needs a tune up? The carb was just adjusted over the winter.

06-28-2007, 01:50 PM	#2
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,117	could probably use a tune up. Timing might be a little to far advanced. Might want to give it a check. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

06-28-2007, 02:52 PM	#3
Ford4x4Chik27 Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali Posts: 1,585	I'd say timing or spark. But it could be one of a million things really. __________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's '01 Pathfinder, making a huge effort to keep it stock, since it's my DD

06-29-2007, 06:37 AM	#6
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 991	i would say more of a fuel pump problem instead of a tuneup problem unless it has been a long time ago for a tuneup __________________ A dirty mind is a terrible thing to waste!

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06-28-2007, 04:53 PM	#4
dreambig73 Full Member Join Date: Feb 2007 Location: Grand Rapids, MI Posts: 9	Thanks. I'll start with checking the timing. I figure it needs a t/u anyway.

06-28-2007, 09:44 PM	#5
75K30 Senior Member Join Date: Jul 2006 Posts: 2,550	Sounds to me more like the fuel pump bud. If the diaghram is bad, or leaking, it will not hold pressure and allow the fuel bowl to drain. Once the bowl is empty, it takes a while to crank until it fills again. Once it does, she runs fine. It mat even run, and start well untill it sits for a while and the fuel drains back out of the bowl. You could change the mechanical pump, or install an electric one, and a regulator. The easiest is to just install a new pump. SBC pumps are a dime a dozen. Two bolts and presto, thing should start every time.

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