Engine Compartment Noise

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Sep 17, 2006 | 04:09 PM

1986coupe

Thread Starter

Burning Brakes

Joined: Jun 2003

Posts: 1,079

Likes: 1

From: Niagara Falls ON

Engine Compartment Noise

I just noticed that there is a wining noise coming from the engine compartment. It almost sounds like the noise a blower makes. Neither of the fans are on while this is happening. Should I check the AIR unit or the AC compressor? Any other ideas of where to begin?

Thanks,
Bill

Sep 17, 2006 | 04:15 PM

87 rag

Drifting

Joined: May 2004

Posts: 1,747

Likes: 1

From: Port McNicoll Ontario

Does the car make this noise all the time? Only when hot? Right when you start the car? only when you touch the gas? etc.

Sep 17, 2006 | 04:36 PM

RRT vette

Le Mans Master

Joined: Feb 2006

Posts: 8,753

Likes: 9

From: Louisiana

I would check the AIR unit. Take the belt off and spin the pulley.

Sep 17, 2006 | 04:47 PM

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

Likes: 34

From: The Top of Utah

You can start with a length of heater hose up to your ear, while you play the other end around the usual suspects, the A.I.R. pump, alternator, power steering pump, water pump, A/C compressor, etc.

RACE ON!!!

Sep 17, 2006 | 05:14 PM

1986coupe

Thread Starter

Burning Brakes

Joined: Jun 2003

Posts: 1,079

Likes: 1

From: Niagara Falls ON

It does it both cold and hot.

I will start it and try to listen to each section.

Sep 17, 2006 | 06:22 PM

williammackean

Race Director

Joined: Sep 2005

Posts: 10,878

Likes: 1

St. Jude Donor '07

I had the same problem. This was my path to enlightenment:

Then disconnect the brake booster hose and go for a drive. Braking will be difficult. Be careful. If the noise is the same, that's not your problem.

Then remove the serp belt and go for a short drive. If the noise is the same, that's not your problem.

If removing the belt stops the problem, disconnect the hose from the AIR pump and go for a drive. If the noise is the same, that's not your problem.

For me, it was the AIR system. I ripped it all out and am experiencing AWESOME results. No codes, better mileage, smoother ride, etc.