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#1 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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I was gonna get some beer but my truck wouldnt start, I got the beer but my truck still wont start. It cranks but I dont have a tester to see if maybe the dizzy isnt getting juice. Any help would be appreciated. Tomorrow I will mess with it after work. I am guessing it may be the dizzy not getting juice but I dont know for sure I may just get a cheap tester to find out. Any suggestions ?
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72 C20 Longbed 05 1500 Z71 |
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#2 |
Registered User
![]() Join Date: Jul 2008
Location: Vancouver Washin-tin
Posts: 168
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Re: truck cranks but wont start
i had the same problem check the fuel filter if its dry then your out of gas or your fuel pump is wack, if its wet then check your lines and if thats clear check your accelerator pump, to do this just poor some gas into the carb and if it fires up for a couple seconds then it is the accelerator pump. Hope its a fuel problem because those are pretty easy to fix
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#3 |
Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,188
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Re: truck cranks but wont start
If its a sudden thing, my guess is an ignition issue. I agree- check 12v at the dizzy. Cracked coil wire will get ya also.
Pour a little ether/gasoline in your carb and crank it. If she fires, you know you have a fuel delivery issue.
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RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e |
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#4 | |
Running on empty
Join Date: Aug 2002
Location: Roanoke, Virginia
Posts: 1,033
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Re: truck cranks but wont start
Quote:
![]() could be alot of things, but my recent experience was with a bad coil; getting yourself a simple tester is a good start
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_____________________________________________ Tim We have two rules here at the Rock. Rule #1: No writing on the walls. Rule#2: Obey all rules 70 GMC Sierra Grande "Custom Camper" Longhorn 402 Big Block TH400 PS PB factory AC Posi; 94 Bronco XLT 302, auto;worn out daily driver ![]() |
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#5 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: truck cranks but wont start
To make an engine run you need fuel and you need spark. A real quick way to see if it is a fuel issue just pour a little bit of fuel in the carb. If it fires spits/studders/maybe runs for a second you have a fuel issue. If the gas in the carb doesn't change your symptoms you need to check for spark.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: truck cranks but wont start
hei or points dizzy? has the truck ever been tuned up or had any other maintenence to try and keep it in a running condition?
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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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#7 |
Registered User
![]() Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,522
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Re: truck cranks but wont start
We are assuming that you drove the truck in, parked it and it wouldn't start the next time you went out to drive it to the store.
As mentioned above it takes Fuel/air, ignition spark and compression all at the same time for an engine to run. Two things that are a necessity in a trouble shooting kit are a good test light and a multimeter. You don't have to go too wild on the multimeter and there are lots of them available for under 10 bucks. the main thing you need to have are a DC volt scale and an ohm meter. I've got a Suntune unit that I picked up at either Schucks or Auto Zone on sale that I tend to use all the time. Check the obvious first: Does it actually have gas in the tank? Is fuel getting to the carb? Usually you can take the air cleaner off and look down the carb while working the throttle by hand and see the squirts from the accelerator pump. Problems could be plugged filter or bad pump. Are you getting spark? I usually start at the plug wire and see if I am getting a spark there and work back through the system. Just make sure you don't have a gas leak on the engine. If no spark, is there power to the coil/distributor? If it has the stock ignition. Make sure that you have power to the coil when you are cranking the engine because if the resistor bypass wire isn't connected it won't usually start while cranking. If you have power to the coil check the points and see if they are working. If it has an HEI the usual culprits are the coil or the module and some times the wires on the pickup coil. For both the point style and HEI Coils there are test procedures posted on the net that involve checking resistances in the circuits in the coils. If the rotor doesn't turn when you crank the engine you have probably lost the gear on the timing chain and have to replace the chain and gears. I have had that happen to me when I put a customer's car on the front end rack and it wouldn't start when I was finished aligning the front end. |
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#8 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: truck cranks but wont start
![]() ![]() I ended up replacing the fuel filter because I it kinda was time to. I got a cheap test light(mine is at home as I am visiting Orange County 350 miles away) The dizzy was getting juice but wasnt sparking the plugs. I found out by trying to shock myself with a spark plug on the no. 1 wire while my wife cranked the motor. I was told that was a for sure way of knowing ![]() I hope it is true. Well I popped the top off the dizzy and the rotor seemed fine but dirty I cleaned it off and I also removed the coil ( I think) where the wires run through and noticed the little spring was either loose or broken I am not sure what its supposed to look like so I put it all back together and tried to start and she fired right up. How often a I supposed to replace any of these parts on the dizzy ? Just for more info it is a GMPP Crate motor 350 HO Deluxe. It came with the dizzy (HEI)spark plugs and wires installed, and intake and Holley 600 cfm vacuum secondary also. Thanks again for all your help, I got more beer coming if anyone wants to kill some time ![]() ![]() ![]()
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72 C20 Longbed 05 1500 Z71 |
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#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: truck cranks but wont start
I inspect my cap and rotor every year or so, and end up replacing it either anually, or semianually. I don't know the 'recomended' span though.
I know I would replace it with new parts before driving 350 miles home,even if it seems fine right now. |
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#10 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: truck cranks but wont start
Yeah, replace that stuff by choice....and under your control, not on the side of the road.
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#11 | |
Gone to greener pastures
![]() Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: truck cranks but wont start
Quote:
As an aside, because I'm lazy, when I have a cranks/but won't start problem; I have somebody crank the engine while I spray some starting fluid (or carb cleaner) down the carburetor. If it fires using ether, but won't run, it's a fuel problem. If it just cranks, it's electrical. It's quick and easy. Then I start trouble shooting from there.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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