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09-10-2011, 03:31 PM | #1 |
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cranks but no start problem
hey guys i have a '68 c20 and today i was driving home and all of a sudden my truck died.when i pulled over i could get it to crank but not strt.it wasn't low on gas because i filled it up right before i left.i noticed it having some sounds like a weak battery when i first started it up but by the second time i tried it fired up just fine.anybody have any ideas?
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09-10-2011, 06:47 PM | #2 |
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Re: cranks but no start problem
Maybe your alternator.
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09-11-2011, 01:28 AM | #3 |
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Re: cranks but no start problem
Could be alt an starter, test the battery
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09-11-2011, 02:34 AM | #4 |
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Re: cranks but no start problem
If it "cranks" (engine spins with the key) you then need fuel and you need spark check for both, just because you put gas in the tank does not mean its getting to the carb.
Welcome to the board from Texas!
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09-11-2011, 09:41 AM | #5 |
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Re: cranks but no start problem
might be heat soak. Stopping for gas may have caused the high temp in the engine compartment to boil the fuel out of the lines causing vapor lock. Does it start after cooling down?
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09-11-2011, 10:26 AM | #6 |
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Re: cranks but no start problem
if everything mentioned above checks out fine, then you might want to also check the ignition module if you have upgraded to HEI.
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09-11-2011, 11:10 AM | #7 |
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Re: cranks but no start problem
we just recently put in new battery and alt and they have correct voltage.we haven't checked for spark yet but about 30 minutes after sitting it started right back up.but right when it broke down we poured some gas right into the carb and it still wouldn't start.after awhile we could smell gas like it was flooding.wouldn't that men gas is getting to the carb?thanks for the help!
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09-11-2011, 11:28 AM | #8 |
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Re: cranks but no start problem
Do you have a hei or points?
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09-11-2011, 04:32 PM | #9 |
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Re: cranks but no start problem
it has hei
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09-11-2011, 04:50 PM | #10 |
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Re: cranks but no start problem
Does it have headers on it? Are the tubes close to the solenoid on the starter? Sounds like heat soak (re-starting) / vapor lock (caused the stall) to me.
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09-11-2011, 05:42 PM | #11 |
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Re: cranks but no start problem
Even new parts can be/go bad. But good you double checked.
Ok, you're pretty certain it's getting gas to the carb. If it isn't what CC69Rat says, that leaves electrical.
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09-12-2011, 01:41 PM | #12 | |
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Re: cranks but no start problem
Quote:
No, it just has the standard manifolds. They don't really run very close to the starter/solenoid, and I just changed out the solenoid. I've thought that heat soak might be the reason, but the heat sheilds are still there, and the problem only recently started happening. How can you tell if it's getting vapor locked, and how do you go about fixing it? |
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09-12-2011, 02:51 PM | #13 |
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Re: cranks but no start problem
This is all the opinion of a somewhat 'shade tree' mechanic .. I could be off too, I'm no pro.
Vapor lock from what I know about it, is usually caused when the heat from the engine bay boils the gas into vapor before it reaches the carb. This can happen in several ways but usually it will be an inline fuel filter or something similar. Fuel lines too close to a hot surface such as a header tube or exhaust or just the engine in general. I understand this concept but personally have never had it happen, .. guys correct me if I am wrong here but if it vapor locks basically it runs out of fuel in that section of the line. The carb runs out of fuel and the engine will die. For the engine to start back up, the temp would need to cool down so the fuel will turn back to liquid form and fill that void in the fuel system. These type of problems, I lean on the old man. I know what it means, I'm just not sure I'm the best person to talk to about how to fix it.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
09-12-2011, 04:44 PM | #14 | |
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Re: cranks but no start problem
Quote:
Have fun....don t. .... |
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09-12-2011, 11:15 PM | #15 |
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Re: cranks but no start problem
Have you guys had any luck finding the problem yet? What else can you tell us about the history on the truck? has it been sitting for a long time? does it run and drive strong when its cold? its it a quadrajet carb? do you have an external fuel filter?
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09-13-2011, 02:20 AM | #16 |
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Re: cranks but no start problem
What does this mean? "recently started happening". That it's been occurring frequently lately? And did you make any changes to the engine/components prior or since?
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09-13-2011, 05:12 PM | #17 | |
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Re: cranks but no start problem
Quote:
It doesn't sit too much, I usually try to get it out pretty often. It's pretty shady sometimes when its cold but after 3-4 minutes it runs like a champ again. I just upgraded to a quadrajet, it had a 2 bbl on it. This made me think that it was getting heat soaked, I've seen quite a bit about that on here. I have 2 spacers under the quad, and I believe its the material that is supposed to prevent heat soak. it's an internal fuely inside the carb, there isn't one in the lines. Did a tuneup on it recently, just made it run better, took the plugs out/double checked the gap on it to make sure everything was correct and it was. |
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09-14-2011, 08:30 PM | #18 |
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Re: cranks but no start problem
pull the dist cap and see if the rotor is turning while cranking. if it's not, you have a broken timimg gear
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