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Old 04-03-2007, 11:13 AM
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Vapor Lock?

I have a question and want to see if you guys can help me out. I just purchased my first car. It's an 81 camaro. When I first got it I drove it down from Anaheim to San Ferndando which is about 1 1/2 away to my house. On the freeway the car overheaded and I was forced to tow it to my house. First thing I did was replace the radiator and did a basic tune up. The car turns on fine every time but the problem is that it won't stay on. If I turn it on and hold the pedal down, then it stays on. But as soon as I let go it, it shuts off. My buddy told me it might be vapor lock. I just want it to be a daily driver. Any advice will be helpul.

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Old 04-03-2007, 11:36 AM
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vapor lock goes away...............
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Old 04-03-2007, 11:39 AM
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How does it cut out? Does it sputter and choke out or just go quick like you turned the key off?
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Old 04-03-2007, 11:40 AM
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Question, How did you do a basic tuneup if it won't idle? I'd try adjusting the idle up high enough that it just stay's running. Then adjusting the timing a little one way or the other and see if you can set the idle lower. The same thing with the idle mixture on the carb. Make sure all vacuum lines are connected with no leaks. Is this electronic ignition or points/condenser vapor lock is usually caused by exhaust to close to a fuel line. I don't think thats your problem or it wouldn't start until it cooled down.
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Old 04-03-2007, 01:53 PM
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As soon as I let go of the gas it sputters and turns off. Im not sure how to adjust the idle though. thanks for advice so far.
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Old 04-03-2007, 02:14 PM
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Have you tried turning the distributor? Maybe give it a little more advance.
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Old 04-03-2007, 04:32 PM
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It could be vapor lock ...IF you have an all metal fuel line from the pump up to the Carb. But starting cold or if there's a rubber hose some where in the line it won't be vapor lock. BUT you do need to check fuel pressure to the carb. Should be 3 to 6 pounds MAX! If your not getting that or real low, you have a bad fuel pump. But if the car runs with your foot into it, i doubt it's the fuel pump. My next guess would be a vacuum leak some where ...loose hoses or something like that, so you would have to keep high RPMs to maintain any kind of vacuum to run. Need to put a vacuum gage on it to check also. There's two starting points that should help, my $0.02 anyway, Good Luck!
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Old 04-03-2007, 05:02 PM
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It's connected with a rubber hose. My buddy reccomended I replace it with an all metal line. I think it might be a vacuum leak because the guy that sold it to me told me that there was a lose hose or something like that but he couldn't find it. Any ideas where I can check first??
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Old 04-03-2007, 05:18 PM
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Vacuum fittings on the carburetor that have plugs, the plugs may be cracked and in need of replacement. After that just go through all the vacuum hoses and check for cracks in the hoses.
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Old 04-03-2007, 05:29 PM
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Quote:
Originally Posted by number_1cropped
As soon as I let go of the gas it sputters and turns off. Im not sure how to adjust the idle though. thanks for advice so far.
how did you do a tune up if you dont know how to adjust the idle screw on the carb, no offense, but you need a manual
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