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post #1 of 10 (permalink) Old 10-27-06, 03:59 PM Thread Starter
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Ppsss! Ppsss! Ppsss!

That is the sound that the engine in my 66 Galaxie LTD is making! I started losing power, kind of jerking a little. I replaced the distributor cap and rotor, and set the points and the timing. It is still losing power intermitently especially after I have driven it a few minutes. I had head gaskets replaced a couple of months ago. Any other ideas? Your help will be greatly appreciated!

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post #2 of 10 (permalink) Old 10-29-06, 02:54 PM
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Re: Ppsss! Ppsss! Ppsss!

any smoke out the pipes? losing any fluids?

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post #3 of 10 (permalink) Old 10-29-06, 04:28 PM
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Re: Ppsss! Ppsss! Ppsss!

Does it make this sound all the time? Even when cranking?
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post #4 of 10 (permalink) Old 10-29-06, 06:27 PM Thread Starter
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Re: Ppsss! Ppsss! Ppsss!

Thanks for your reply. It cranks and starts and runs great at idle. It only makes this sound when the engine is under load. It seems to be either a loss of compression or a vacuum leak, but it isn't just a steady hissing, it is more like repeated short sounds.

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post #5 of 10 (permalink) Old 10-29-06, 06:28 PM Thread Starter
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Re: Ppsss! Ppsss! Ppsss!

None that I can tell. Oil and anti-freeze both look good. Thanks!
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post #6 of 10 (permalink) Old 10-29-06, 06:54 PM
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Re: Ppsss! Ppsss! Ppsss!

Best wild guess I can think of. It sounds like compressing blowing by a spark plug or something. I don't know if a cracked head or leaking gasket could do this or not. Just my 1 cent worth.
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post #7 of 10 (permalink) Old 10-30-06, 02:51 PM
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Re: Ppsss! Ppsss! Ppsss!

how old is the exhaust? a plugged exhaust could do that with the noise being a leak at the manifold from the engine pushing the exhaust out anyway it can. this is more common with a catalytic converter falling apart internally but a mufflers baffles can float around inside and plug the outlet then at idle the piece falls back into place on the muffler floor opening the outlet. check that the spark plugs are tight too.

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87 Chevy Caprice Classic Wagon-307, 2004R, 10 Bolt, what can i say, i grew up with that car
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post #8 of 10 (permalink) Old 11-03-06, 06:42 AM Thread Starter
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Re: Ppsss! Ppsss! Ppsss!

Would a plugged exhaust cause a significant loss of power? I am starting to think that this is the culprit.


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Originally Posted by 390wagon
how old is the exhaust? a plugged exhaust could do that with the noise being a leak at the manifold from the engine pushing the exhaust out anyway it can. this is more common with a catalytic converter falling apart internally but a mufflers baffles can float around inside and plug the outlet then at idle the piece falls back into place on the muffler floor opening the outlet. check that the spark plugs are tight too.
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post #9 of 10 (permalink) Old 11-03-06, 04:43 PM
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Re: Ppsss! Ppsss! Ppsss!

Definately could cause loss of power.
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post #10 of 10 (permalink) Old 11-03-06, 04:46 PM
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Re: Ppsss! Ppsss! Ppsss!

for sure.

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