Torando like noise

Tiny
ANGIE04
  • MEMBER
  • 2000 CHEVROLET S-10
  • 2WD
  • AUTOMATIC
  • 110,348 MILES
My 2000 chevy s 10 was making a sound like a torando siren when it is just sitting and it dosent do it all the time why would it be making that noise for?
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Wednesday, March 23rd, 2011 AT 6:05 PM

5 Replies

Tiny
SATURNTECH9
  • EXPERT
Does the noise go away as soon as you give it gas?Does it sound more like a tea kettle whistling?
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Wednesday, March 23rd, 2011 AT 10:38 PM
Tiny
ANGIE04
  • MEMBER
Yeah the noise does go away after I give it gas and yeah it sound like a tea kettle. I hope you know what this is no one else can help me.
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Thursday, March 24th, 2011 AT 4:53 PM
Tiny
SATURNTECH9
  • EXPERT
It sound's like a vacuum leak somewhere the 8th digit of your vin is it a 4 or a 5?I posted a bulletin that is for both those vins let me know what number you have and if the noise is coming from the idle air control valve.
File In Section: 06 - Engine/Propulsion System

Bulletin No: 00-06-04-053

Date: December, 2000

TECHNICAL
Subject:
Idle Air Control Valve (IACV) Hissing Noise (Replace the IACV)

Models:

1999-2000 Chevrolet Cavalier
1999-2000 Pontiac Sunfire
1999-2000 Chevrolet and GMC S/T Models (510, Sonoma)
with 2.2 L Engine (VINs 4, 5 - RPOS LN2, L43)

Condition

Some owners may comment on a hiss noise at closed throttle only. This may sound similar to a belt noise or a power steering pump noise when it is cold. The noise source may be identified by using a hose or a stethoscope and listening in the Idle Air Control Valve (IACV) area. This noise is most noticeable after releasing the throttle at cold idle (105-1200 RPM). The noise is related to the IACV pintle position, typically around 50 counts for cars and 70 counts for trucks.

Cause

The condition may be caused when air moves past the shoulder of the IACV pintle. The current profile imparts a disturbance to the airflow, which propagates into the intake manifold. As a result, the manifold walls vibrate causing the noise. To identify if the noise is due to the IACV, connect a Tech 2 to a warm engine and adjust the idle from 1050 RPM to 1200 RPM. The noise will be revealed if the IACV pintle is of the old design.

Correction

Replace the IACV with P/N 12482707. Refer to the Engine Controls sub-section of Engine in the appropriate Service Manual for IACV replacement.

Parts Information

Part Number Description Qty

12482707 Idle Air Control Valve 1
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Thursday, March 24th, 2011 AT 5:11 PM
Tiny
ANGIE04
  • MEMBER
Yeah I went out and I looked at my vin number and the 8th number is a 4. So I havent had this truck a month yet and something is already worng so what do I need to do from here. I hope I didnt buy a lemon and if so please let me know. I just need to know what to do next to fix it or if it is worth fixing?
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Friday, March 25th, 2011 AT 4:33 PM
Tiny
SATURNTECH9
  • EXPERT
I wouldn't call it a lemon it just sound's like a vacuum leak I posted a diagram of your idle air control valve it's number 2 in the diagram. Let's start by you following the bulletin I posted in my first post and let me know what you find and we will go from there.
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Friday, March 25th, 2011 AT 5:12 PM

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