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Start Up Honking Noise

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TexasEdition Enthusiast

TexasEdition

Posted
Posted

I own a 2004 Sierra 4.8L and I've noticed for about a month now that I get a quick honking noise at start up. This only happens once a day when the temp is cold outside. Also, If I shut the engine off immedietly and start it up again, the honking noise will not be there. Anyone else have this problem? It really annoying.

Guest Riggs

Guest Riggs

Posted
Posted

a buddy of mine had a CAT that was sitting on his tranny. he would just sit there and when he got out he would hear a meow or two. i twas there for about a week before he chased it out. it was a 98 Silverado

cjtreibel70 Enthusiast

cjtreibel70

Posted
Posted

it could be coming from your power steering pump. when the fluid in there is really cold it doesnt like to move therefor makeing a noise simmelar to what you are explaining

cmoore74 Enthusiast

cmoore74

Posted
Posted

I have the exact same problem. Only happens when cold and the first start. There's also a TSB on this about having an out of position power steering pump mounting bracket. The issue is called a "cold start squawk". I have a copy of the TSB and can PM it to you if you like.

 

I took it to the dealer as it's under warranty, but they "could not reproduce the problem" as it only happens first thing in the AM and it has to be cold.

 

To get it fixed you may have to leave it over night and make sure it's gonna be cold enough the next morning. I have not yet left it there over-night to get it fixed.

WFO Enthusiast

WFO

Posted
Posted
I have the exact same problem. Only happens when cold and the first start. There's also a TSB on this about having an out of position power steering pump mounting bracket. The issue is called a "cold start squawk". I have a copy of the TSB and can PM it to you if you like.

 

I took it to the dealer as it's under warranty, but they "could not reproduce the problem" as it only happens first thing in the AM and it has to be cold.

 

To get it fixed you may have to leave it over night and make sure it's gonna be cold enough the next morning. I have not yet left it there over-night to get it fixed.

 

 

Could you please post the TBS?

 

Thanks,

Mike

TexasEdition Enthusiast

TexasEdition

Posted
  • Author
Posted

Yes that would be great. I have a PCM tune and I want to make the mechanic aware of this before something gets worked on (no warranty also). Wait......will this effect a custom PCM tune if it's a computer problem?

Thanks, I was begining to think I was the only one with this problem. :D

sceptre Enthusiast

sceptre

Posted
Posted

i've got that same noise on cold starts....the work truck i used to have (2007 F350 SD) did is as well, only 100 times worse. I just kinda figured it was normal as it only does it for a second.

cmoore74 Enthusiast

cmoore74

Posted
Posted

Here ya go, it's a long one...

 

 

Subject:Accessory Drive Belt Chirp, Squeal or Squeak Type Noise at Cold Idle (Replace A/C Compressor/Power Steering Pump Mounting Bracket or Enlarge Bracket Bolt Holes) #05-06-01-018A - (03/07/2007)

Models:2004-2007 Chevrolet Silverado (Classic)

 

2006-2007 Chevrolet Express

 

2004-2007 GMC Sierra (Classic)

 

2006-2007 GMC Savana

 

with 6.6L Duramax® Diesel Engine (VINs D, 2 - RPOs LBZ, LLY)

This bulletin is being revised to add additional model years, models and update the technical content. Please discard Corporate Bulletin Number 05-06-01-018 (Section 06 -- Engine/Propulsion System).

 

 

Condition

Important: It should be noted that a chirp type noise on engine shutdown is normal for a diesel engine due to higher engine compression and the rapid stopping of the crankshaft. No repairs should be attempted for this condition.

 

Some customers may comment on an accessory drive belt chirp, squeal, or squeak type noise at idle, especially on a cold start. The noise may be reduced or go away after the engine warms up.

 

 

Cause

Some 2004/2005 Silverado or Sierra trucks, with a 6.6L LLY engine produced before June, 2004, may have an A/C compressor/power steering pump mounting bracket and power steering rear mounting bracket that are machined slightly out of specification, causing a misaligned power steering pump.

 

If the power steering pump is misaligned, it will force the accessory drive belt to run farther inboard on the fan pulley. When the belt leaves the fan pulley, the belt will not align properly to the crankshaft pulley grooves and create a chirp or squeak type noise at the point of interference.

 

Vehicles built after June 2004 will already have the new A/C compressor/power steering pump mounting bracket installed, but still may exhibit belt noise caused by the power steering pump rear mounting bracket.

 

 

Correction

Vehicles built prior to June 2004, replace the A/C compressor/power steering pump mounting bracket.

 

Vehicles built after June 2004, enlarge the rear power steering pump bracket bolt holes.

 

1. Follow the published service information (SI) diagnostics for drive belt chirping. The diagnostic chart for the drive belt chirping will ask to inspect for a misaligned accessory drive pulley.Important: Remove the top section of the radiator shroud and TCM/cover to gain access to check alignment and measure the power steering pulley on the power steering pump shaft.

2. Verify that the power steering pulley is properly pressed onto the power steering pump shaft. Refer to SI for the power steering pulley replacement. If the pulley needs to be realigned on the power steering pump shaft, follow the published SI procedures for the power steering pulley replacement.

 

3. If the noise was not fully eliminated by the procedure in step 2, the power steering pulley may be adjusted with an allowable maximum variance of 1.0 mm (0.039 in) to the front from the flush position on the shaft to assist in eliminating any remaining belt noise. Refer to graphic illustration number 1 and number 2. Ensure that the power steering pump pulley illustration number 1 is flush against the power steering pump shaft illustration number 2, with an allowable variance of 1.0 mm (0.039 in).

4. If the noise was not fully eliminated by the procedure in step 3, and there are no other concerns found, follow the published SI diagnostics for drive belt chirping. Then, if the vehicle was built prior to June 2004 go to step 5. If the vehicle was built after June 2004, go to step 6.

 

5. Vehicles Built Prior to June 2004:

5.1. Replace the A/C compressor/power steering pump mounting bracket with P/N 97362175. Refer to graphic illustration number 1. Follow the published SI procedures for the Air Conditioning (A/C) Compressor and Power Steering Pump Mounting Bracket Replacement.

5.2. With the new A/C compressor/power steering pump mounting bracket installed, reposition the power steering pump to gain access to drill larger holes into the rear mounting bracket using a 14 mm (1/2") drill bit. Drilling the bolt holes larger will ensure proper alignment of the bracket when installing the bolts. Refer to graphic illustration number 2.

5.3. Install the power steering pump to the A/C compressor/power steering pump bracket. Refer to graphic illustration numbers 4, 2, and 1.

Important: Power steering pump front mounting bolts must always be tightened first to ensure correct pulley alignment.

5.4. Refer to graphic illustration number 4 and tighten the front power steering pump mounting bolts.Tighten

Tighten the bolts to 50 N·m (37 lb ft).

 

5.5. Refer to graphic illustration number 2 and tighten the rear power steering bracket bolts.Tighten

Tighten the bolts to 50 N·m (37 lb ft).

 

 

 

6. Vehicles Built After June 2004:

6.1. Remove the front and rear power steering bracket bolts from the A/C compressor/power steering pump bracket. Refer to graphic illustration numbers 4, 2, and 1.

6.2. Reposition the power steering pump to gain access to drill larger holes into the rear mounting bracket using a 14 mm (1/2 in) drill bit. Drilling the bolt holes larger will ensure proper alignment of the bracket when installing the bolts. Refer to graphic illustration number 2.

6.3. Install the power steering pump to A/C compressor/power steering pump bracket. Refer to graphic illustration numbers 4, 2, and 1.

Important: Power steering pump front mounting bolts must always be tightened first to ensure correct pulley alignment.

6.4. Refer to graphic illustration number 4 and tighten the front power steering pump mounting bolts.Tighten

Tighten the bolts to 50 N·m (37 lb ft).

 

6.5. Refer to graphic illustration number 2 and tighten the rear bracket bolts.Tighten

Tighten the bolts to 50 N·m (37 lb ft).

 

Dual Generator System

New belts are not available for dual generator systems. If a belt chirp noise is occurring on a dual generator system, please complete a Field Product Report (FPR). The instructions for completing a FPR can be found in Service Bulletin Number 02-00-89-002F.

 

 

Parts Information

Part Number

 

Description

 

Qty

 

97386417

 

Bracket, A/C Compressor and Power Steering Pump Mounting

 

1

 

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

 

Description

 

Labor Time

 

J7509*

 

A/C Compressor and Power Steering Pump Mounting Bracket - Replace

 

(Vehicles Built Prior to June, 2004)

 

0.7 hr

 

Add:

 

Enlarge Rear Power Steering Pump Bracket Bolt Holes

 

(Vehicles Built After June, 2004)

 

0.3 hr

 

Add:

 

Removal of Auxiliary Generator (if equipped)

 

0.1 hr

 

*This is a unique labor operation number for bulletin use only. This number will not be published in the Labor Time Guide.

cmoore74 Enthusiast

cmoore74

Posted
Posted

It also could be the fluid as well as someone stated previously. I read where a switch to valvoline synthetic power steering fluid could help if the problem described in the TSB is not the culprit.

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