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Old 03-13-2017, 09:55 AM
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1992 Prostar vacuum question

I have a 1992 Prostar with the 351 HO and Powerslot. I changed the cap, rotor, wires, plugs and both fuel filters. A lot of vacuum was coming from where my finger is pointed. Is this normal?




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Old 03-13-2017, 10:38 AM
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Put a vacuum cap on there. It will run better too.
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Old 03-13-2017, 10:54 AM
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Thanks. Will do. I don't ever remembering it making that hissing noise before. When I would put my finger over the hole it would seem to run better.
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Old 03-13-2017, 11:50 AM
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Those vacuum caps eventually dry out and just fall off. It usually happens during the off season but can happen while you are running down the lake. Some parts stores have silicone vacuum caps and they hold up better.
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Old 03-13-2017, 11:53 AM
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Maybe it's the photo, but that looks like the vacuum tube going to the intake manifold area is unplugged from the PCV valve. Did you pull that tube off to take the picture? If not, just plug the tube back onto the plastic PCV valve nipple.

Nevermind....i see now that the tube is plugged into the PCV valve lower port. I should have known not to disagree with thatsmrmastercraft. But since we were not talking about carbs or wheels, I had a shot for him to be wrong...... :-)
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Old 03-13-2017, 12:06 PM
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Thanks guys.

Now another question. What's the best way to clean that engine without damaging any of the electrical components or anything else?
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Old 03-13-2017, 03:05 PM
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Not much electrical there to damage. you can put a bag over the carburetor, distributor cap and alternator. After that you are good to go. You can use a spray on engine cleaner, just be careful to use enough tarp to protect the carpet. You can use a garden hose at half pressure to hose it off. I don't think I would use a pressure washer. Otherwise, a spray degreaser and an assortment of kitchen sink and NEW toilet brushes with get in a lot of places to get things clean.
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Old 03-13-2017, 04:04 PM
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And use a compressor and blow gun to remove as much water from electrical connectors as possible. Might not be a bad time to put some dielectric grease on all of the electrical plugs and do a visual inspection of the connections. Best to do it on a warm, dry day and not when it's cold- the water won't stay around too long if it's warmer.
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