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Old 09-22-2003, 11:29 AM
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Hissing sounds coming from engine.

Howdy all!!!

Hope everyone had a great weekend. I pushed the Mustang out of the garage and fired it up this weekend. I set off every alarm in my apartment complex..sounded like WWIII with all the alarms sounding when I shut the motor down. LOL It was hilarious...

Anyway, I noticed twice this weekend when I shut the motor down a hissing sound that most likely is coming from compression in a cyclinder that hadn't fired before I powered it off. Is this something to be concerned with? The hissing lasted about 6 - 8 seconds and gradually became quieter and quieter...

I haven't re-torqued the heads yet as it only has about 1 hour on it so far. I didn't see that FelPro needs re-torqued...but I will anyway just in case.

Just curious.

For those wondering;

'67 Mustang
429 Ford Big Block
DOVE-C heads - reconditioned
11.5:1 Forged flat top pistons
Bored .30 over
Stock crank
Medium cam (dont have specs with me right now)
new hyd. lifters
hardened push rods
roller tip rockers
Holley 850 DF DP jetted 84F/82R
C6 trans
stock converter
Ford 9" rearend
4:11 posi
nice stereo...hmmm what else. LOL

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Last edited by '67Pony; 09-22-2003 at 11:39 AM.
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Old 09-22-2003, 12:30 PM
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I don't think your hearing compression leakdown, how about vac. leak, brake booster, coolant hose? I'm guessing there's no a/c?
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Old 09-22-2003, 12:40 PM
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you're right, no a/c. no power brakes. the hoses that go inside to heater core are plugged for the time being. I have a 5" piece of hose going from the water pump to the block where those are supposed to hook up. I'll connect those up later when I get around to plumbing them properly. All vacuum nipples have been removed from the intake and plugged. And I made sure to teflon tape the plugs before I screwed them in. The only one left is on the back of the carb. and I have it plugged real good.

The only oddity in this puzzle is that I haven't filled the power steering pump with fluid yet.

TIA
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Old 09-22-2003, 01:58 PM
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sssssssounds like vacuum. sure you got all the holes plugged?
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Old 09-22-2003, 02:08 PM
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I know this might sound stupid but check and make sure your plugs are tight, I had a guy come to me one time like that. Hope It's that simple If not whip out the compression guage and go to work.
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Old 09-22-2003, 02:58 PM
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I've started it about 15 times so far and it just started doing it....could it be an indication its time to re-torque those heads? Even though Felpro says you don't need a re-torque their head gaskets there is so much talk about re-torquing that something is telling me thats where the problem is.

Sounds to me like a good time to put the aluminum valve covers on!!!

I'll check tonight and see if there are any loose manifold plugs and/or spark plug. I didn't have the right size plug socket early on and I eventually bought the bigger of the two and tightened those puppies...I may have missed one or didn't get one good and tight..

thanks for the input folks!!!
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