A few engine questions
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From: Quispamsis, N.B, Canada
A few engine questions
Hey guys, moose here.
My motor has been somewhat good to me and its really the only thing on the truck that has been decent the whole 1 1/2 years I've had my f150. But all of a sudden there is this hissing sound coming from I think near the front of the engine. It does this sound when it's revved and when I drive. It doesn't sound like air is leaking but does sound bad I think. It happens and then doesn't and then happens again. You can even hear it at idle. Does anyone know what that could be?
2nd thing is that what is with my crankcase hot air filter sucking oil up thru into the airbox? I mean this has to be one of the dumbest setups put out by ford. I could just slap a plain old filter on there and be done with it, but don't I need the warm air in the air box for the senors? It's a milky oil coming into the air box saturating the filter and making it soaked.
I'm glad I put 5w40 in my motor as its -5 outside right now. I expect it to get around -25+ this winter and wanted to be on the safe side, so do you think it was a good idea to run the lighter oil? I had never had a problem with 10w30 last winter but I noticed the sound from the oil pump, I think that was the oil pump.
Thanks for reading guys, this trucks been quite the fixer upper and I'm almost to the point where I might just sell it, but I love it, so I dunno. Thanks.
My motor has been somewhat good to me and its really the only thing on the truck that has been decent the whole 1 1/2 years I've had my f150. But all of a sudden there is this hissing sound coming from I think near the front of the engine. It does this sound when it's revved and when I drive. It doesn't sound like air is leaking but does sound bad I think. It happens and then doesn't and then happens again. You can even hear it at idle. Does anyone know what that could be?
2nd thing is that what is with my crankcase hot air filter sucking oil up thru into the airbox? I mean this has to be one of the dumbest setups put out by ford. I could just slap a plain old filter on there and be done with it, but don't I need the warm air in the air box for the senors? It's a milky oil coming into the air box saturating the filter and making it soaked.
I'm glad I put 5w40 in my motor as its -5 outside right now. I expect it to get around -25+ this winter and wanted to be on the safe side, so do you think it was a good idea to run the lighter oil? I had never had a problem with 10w30 last winter but I noticed the sound from the oil pump, I think that was the oil pump.
Thanks for reading guys, this trucks been quite the fixer upper and I'm almost to the point where I might just sell it, but I love it, so I dunno. Thanks.
Senior User
Joined: Jan 2004
Posts: 279
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From: Kansas City, MO
Hissing noise is probably a vacuum leak of some sort. 5w-40 is probably a smart choice to wear you live. 10w-30 is pushing it when your talking about temperatures that cold. Not exactly sure what the deal is with "It's a milky oil coming into the air box saturating the filter and making it soaked." That doesn't sound good last time I checked.
Postmaster
Joined: Dec 2003
Posts: 2,659
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From: S/C Texas
There was big conversation about milky oil last winter sometime. Turned out lots of people with the 302 had the same problem. It turned out everyones oil was fine.....we just had condensation. I believe most everyones was just on the dipstick. I dont recall anyone mentioning milky oil in the filter box.
I'm guessing, but might a bad PCV get some oil and condensation into the box?
I'm guessing, but might a bad PCV get some oil and condensation into the box?
Senior User
Joined: Jan 2004
Posts: 279
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From: Kansas City, MO
Vacuum leaks are relatively easy to hear, but you have to find them first 
Personally I've always used a siphoning hose (black hose about 1/2" in diameter, about 2 feet long) put it up to my ear, and moved it slowly around the general leak area to pinpoint where exactly the leak was coming from. First I recommend checking your idle screw, however. The idle screw is usually located on/around your throttle body, just a guess but alot of times when your idle is set to high *for some reason* it sounds much like air rushing in from the outside. You could very well have to replace a hose here and there, but make sure you pinpoint the exact location of the leak(s) before you do.
Hope it works out for ya
Personally I've always used a siphoning hose (black hose about 1/2" in diameter, about 2 feet long) put it up to my ear, and moved it slowly around the general leak area to pinpoint where exactly the leak was coming from. First I recommend checking your idle screw, however. The idle screw is usually located on/around your throttle body, just a guess but alot of times when your idle is set to high *for some reason* it sounds much like air rushing in from the outside. You could very well have to replace a hose here and there, but make sure you pinpoint the exact location of the leak(s) before you do.Hope it works out for ya
Last edited by Andyman8282; Oct 30, 2004 at 11:57 AM.
Senior User
Joined: Jun 2004
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From: Florida
How many miles on the motor? Sounds like blowby to me and a lot of it, had a old motor that did the same thing. The milkly substance is either gas and oil mix or water/oil. Water/oil will have a tan white color, if this is the case you have water going into the crankcase, probably a head or intake gasket, hard to say. If the oil in the filter box has a real strong odor and is reddish or still brown, then check your pcv valve, but usually this means the gas is leaking past the rings. Good luck
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Laughing Gas
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From: Brandon Mb
I agree with thomadm, seems to be blowby. Check on your plugs, see if there what kind of shape they are in. Also, a vacuum leak would generally make the engine run bad. If it still runs fine, might not be a vacuum leak. To test, spray something flammable around where ever a vacuum leak could be (intake probly), and if it levels out, then you've found your leak. Works all the time for me.
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From: Brandon Mb
Level out means if it was running rough, had a miss, anything like that, and then you spray something flammable around the intake, and it runs normally, that mean it levels out. I said this to someone earlier today who had the same problem. It's running on borrowed time. It could run a long time yet. A friend of mine has a 89 F-150 that should have died a long time ago, but still runs. Not very often, but it runs. You can't be too sure. It's a sign things are weak inside, so I would budget for a new engine in the future.
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