Loud Squeal from Front of Motor

[Rumblin70SS396]

Hey all,

Trying to make progress with this car and it's just one thing after another.

Just replaced the oil lines which fixed my oil leak, but after it ran for about 10 minutes I started hearing a loud pitched squeal from the front of the motor. The car idles high (1500) which I believe is a vacuum leak but not sure what this now is. Oil level is fine with good pressure.

Service engine soon light is on which I will investigate later when the car and I cool down.

Any ideas? Bought this car 4 years ago and I have yet to put 100 miles on it.

Thank you,

Tony


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[onetinsoldier]

could be belt squeal ? Tensioner bearing ? compressor bearing squeal ? Alternator bearing , water pump …….I don't like doing this but try wd40 at each location to pinpoint it ! when it goes away you found it .

as for the high rpm ,possible tach is not reading correctly . theres a way to check ,if I remember correctly : you hold the ac fan buttons down(up/down) at the same time until the display reads 0 , then press the fan button in the middle till it shows 6 . then it will show you a number , multiply it times 25 and that's the correct rpm .

[Rumblin70SS396]

Thank you for the reply!

After doing some research I can see it being any one of them. I definitely have a vacuum leak with the high idle. It's not like it's a little high with the idle, it's super high and almost impossible to drive.

I'm going to start by taking the air cleaner assembly off and retorque the intake bolts. It's a siamese runner intake so it leaks more than less.

Also need to check the codes and the SES light popped on today.

I'm out now but will post an update tonight or tomorrow morning.

Tony


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[Rumblin70SS396]

Once I got home, restarted the car and no squeal. Let it run for about a minute and tried turning the headlights on in which squeal immediately returned.

I had to jump the car to start it's its been sitting so I fully charged the battery last night to see if that makes any difference.

Also had code 65 set which may be related to the vacuum leak.

Going to try the smoker today to see if I can find that leak.

Tony


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[Paul Workman]

Often sound echos around under the hood making it difficult to pin-point the source.

Marc Haibeck showed me a trick using a mechanic's stethoscope to find a the source of a squeal. He removed the diaphragm and steel probe section from the rubber tubing and just used the open tubing to poke around the various pulleys, etc.

In my case, it was the water pump. (The embarrassing part was that I earlier had convinced myself it was the power steering pump and had already replaced it...only to have the squeak return as before!)

[32valvZ]

If when you turned the headlights on, the squeal began, and you had to jump it.... sounds like the alternator to me.

[emmvette]

I'm going to give you something totally different, but easier to try to find. Check the seal around the plenum up top on all side. The fact that it comes on after it gets a little heat signals it could be that. You can try to isolate the noise by listening wyith your ear close all around the seal, but it becomes really easy if this is it, to find it with the mechanic's stethoscope. They are only $10 - $15 and will really help find this.

The correct fix is obvious, but if it's this type of leak you can seal it with another $10 or less of high temp tape. Push some electrical tape up against the leak, or better yet a small piece of high temp aluminum tape or self adhesive duct seal :-)

It could get you by for the summer.

I spent a lot of time and few dollars and had my alternator rebuilt to find out my noise was a plenum leak right above the alternator :-)

[onetinsoldier]

Spray some carb cleaner where you think there is a leak while the engine is running ,the idle will change .

[emmvette]

Did you figure this out yet? What did you find?

[DRM500RUBYZR-1]

Did you figure this out yet? What did you find?



Hopefully it was not a neighbor's cat.
Marty

[rkreigh]

the pilot bearing can be a squealin beeotch sometimes that then goes away


take a mechanics stethoscope and a buddy and you'll find where the noise is coming from

[Paul Workman]

If when you turned the headlights on, the squeal began, and you had to jump it.... sounds like the alternator to me.

Um, could be. But, unless I missed it, has a slipping belt been eliminated yet?

To do that, spritz the grooved side of the belt with a little Windex, or just plain water (even). If the squealing quits or the sound quiets down, it might be the belt. And, if the belt shows any signs of "checking" (the rubber ribs cracking all along the entire (inside) length of the belt), it is time to replace it.

Belts by GATES seem to be quality items - last 5 years or more (15-20k miles...something like that).

[Rumblin70SS396]

Hello all,

Sorry for the late replies guys. I was sick last week and work a lot of hours in addition to having a 3 month and 4 year old.

The squeal is still there even with a fully charged battery. I haven't done any more investigation than that but I plan on getting to it this week.

In addition to the squeal I believe I have a bad vacuum leak as I can't get the car to idle lower than 1500rpms.

I have a smoker for leak detection but my compressor is down right now so I will be taking it to my Dads house down the road to diagnose both issues.

I'd be happy to just get all the bugs worked out so I can drive it for a bit before selling it.

Thanks all,

Tony


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