Noise from MAF?

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Feb 15, 2007 | 10:06 PM

V's Vette

Thread Starter

Racer

Joined: Apr 2004

Posts: 306

Likes: 0

From: Cotati CA

Noise from MAF?

I think I'm losing it...the MAF on my '89 is making a hissing sound just like when a spot on the engine has a vacuum leak. It's coming from below the sensor where the wiring plugs into the unit. I know this sounds odd, but I'm sure that that is where the sound is coming from because I've isolated it using tubing and listening carefully all around the area of the sensor. I've taken the MAF off and looked it over -- no obvious signs of why it would make this sound. Got any ideas what I'm looking at here?

Feb 16, 2007 | 12:42 AM

Ttime

Burning Brakes

Joined: Jan 2006

Posts: 847

Likes: 0

From: Colorado Springs CO

I have no idea. My guess is that the sensor isn't tight on the MAF housing.

Here's a bump.

Feb 16, 2007 | 08:13 AM

RRT vette

Le Mans Master

Joined: Feb 2006

Posts: 8,753

Likes: 9

From: Louisiana

Yep, check where the MAF connects to the air ducting on both sides. You may an air leak just after the sensor that is unmetered.

Feb 16, 2007 | 09:00 AM

V's Vette

Thread Starter

Racer

Joined: Apr 2004

Posts: 306

Likes: 0

From: Cotati CA

Quote:

Originally Posted by RRT vette

Yep, check where the MAF connects to the air ducting on both sides. You may an air leak just after the sensor that is unmetered.

I'll check that, but I've connected it as usual and not had this problem before. Maybe I should try wrapping it w/some sort of tape to see if this helps? Or maybe I should wrap it some other way or w/something else?

Feb 16, 2007 | 12:56 PM

BADDUCK

Le Mans Master

Joined: Jun 2006

Posts: 5,642

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From: One day you're a Comet...the next day you're dust... Arkansas

The coupler material stiffens up when it's cold. Adjust and tighten it while it is warm. Also make sure the underneath side the MAF housing isn't cracked.

Feb 16, 2007 | 01:19 PM

Pete K

Race Director

Joined: Feb 2004

Posts: 12,518

Likes: 19

Remove the accordian duct and open it up and inspect it. They are known to crack between the pleats.

Feb 16, 2007 | 01:32 PM

SunCr

Le Mans Master

Joined: Dec 2000

Posts: 7,839

Likes: 22

From: San Diego, Ca

Well, just to be sure it isn't some electronic thing (I don't know how it could be), you might first disconnect the harness and see if it goes away. If not - everything else suggested though you might also look for cracks, particularly where the harness plugs in.

Feb 16, 2007 | 04:32 PM

JrRifleCoach

Team Owner

Joined: Sep 2003

Posts: 20,179

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From: Freedom is never more than one generation away from extinction.

St. Jude '03 thru '24

Using a magnifying glass and high power light source check the housing for cracks. You may also want to try using a sealant around the parting line of the electronics module.

But first ensure there are no cracks in the intake ducting.