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squeal on acceleration - CCV?

14489 Views 8 Replies 6 Participants Last post by  Fudman
I bought this 2002 525it, M54, auto with 100k miles about a month ago. With the colder weather coming to Virignia, I noticed something different last night when I drove her.

While the engine was still cold, she produced a high-pitched squeal when accelerating away from a traffic light. After I relaxed the throttle, the squeal went away. It also never happened again once she warmed up. It

I'm thinking this is the CCV system, but this seems like an unusual symptom. I haven't found any other threads where anyone mentioned this unique symptom.

Thanks
1 - 9 of 9 Posts
A squeal would more likely be caused by a belt or pulley. The CCV does not have any high speed moving parts. Hence, it could not create a squeal (if that is an accurate description of the sound). The CCV pipes might have a leak. These leaks tend to cause CELs and the sound is generally imperceptible. If you are on your original cooling system, I would check that out first. You are due for a replacement. Otherwise keep an eye on your engine temp. ALWAYS.
I agree with Fudman check your belt. Look for any fluid that might be dripping on the belt as well.
Not trying to jack OP's thread i just have this same issue and dont want to flood the board... but anyways

Fudman,
I have this same issue with my 2000 528i 239k KM on it. I have no knowledge if the pully was ever replaced (any recommendations on brands/ websites?? they must ship to canada), nor do I know what belts have been replaced and when. What do you recommend checking into first, as ATM its near Christmas and my budget is a little tight and I don't want to have to replace stuff if it isn't a dire emerg.
A squeal would more likely be caused by a belt or pulley.
Determine when your car makes this sound (cold or hot, high or low rpm, moving or standing still). If unrelated to vehicle movement, simply recreate the conditions and open the hood and have an assistant step on the gas while in park. Locate the source of your sound using a stethascope (~$8 at Harbor Freight) or just listen carefully. If you can't identify the source of the sound, replace evrything close to the source (I am not kidding since those parts should be rpelaced by 100K anyway) If you are on your original cooling system at that mileage (~150K miles), you DEFINITELY need a cooling system overhaul. This is the most important of all preventive maintenance due to the consequences of cooling system failure. To not do this risks cooking your engine.
Not trying to jack OP's thread i just have this same issue and dont want to flood the board... but anyways

Fudman,
I have this same issue with my 2000 528i 239k KM on it. I have no knowledge if the pully was ever replaced (any recommendations on brands/ websites?? they must ship to canada), nor do I know what belts have been replaced and when. What do you recommend checking into first, as ATM its near Christmas and my budget is a little tight and I don't want to have to replace stuff if it isn't a dire emerg.
The noise is only generated when moving. If i lightly press the accel pedal, it will make the noise, however pressing harder down the noise does not generate. This happens cold or hot. I was thinking originally it was my fan...but if it was it would make the sound all the time would it not? just to affirm its only when car is in D, and light acceleration is applied.
Does it happen around a certain RPM range? I had the same issue and it turned out to be a bad gasket on the air valve for the SAP.
You have 3 options for pulleys

Option A
Often the pulley bearing is just dry, but still OK. Regrease with high speed spindle grease suitable for the up to 20,000 RPM these pulley rotate at red line. E.g. Molykote BG-20, 150g tube good for dozens of pulleys will run around $15. Try industrial supply or a bearing supply houses. Search the forums for regreasing DIYs.

Option B
buy a replacement pulley roller at any local auto supply house. Dayco is a common brand that does supply substitutes for BMW pulleys. You can buy rollers for idler, seperentine tensioner and A/C tensioner (mechanical or hydraulic for both.)

Option C
Buy the idler or tensioner assy for your engine. INA is the OEM brand but any GOOD brand name should be OK. I've been well served by these vendors into Canada. Check prices including shipping. Best total cost varies with exact part being ordered; it helps to order a basket of parts to help offset the fixed shipping and brokerage cost.

http://faulknerbmwpartssource.com/partlocator/index.cfm?siteid=216042
http://www.bestpricecarparts.ca/[email protected]@X&modelid=1056:ED|589:MBC|[email protected]@530i&mode=PG
http://www.bimmerspecialist.ca/parts/index/bmw
http://www.eaceuroparts.com/
http://www.eeuroparts.com/

This site searches many US sites at one go. Many of them ship to Canada. But, be sure to check they don't use UPS unless they quote a UPS WorldEase rate; otherwise you will be shocked on delivery with with extreme brokerage charges at your door; $50 to $100+. Every other courier and USPS is $0 to $10 per delivery. Plus HST of course.
http://www.furiousmethod.com/
Not trying to jack OP's thread i just have this same issue and dont want to flood the board... but anyways

Fudman,
I have this same issue with my 2000 528i 239k KM on it. I have no knowledge if the pully was ever replaced (any recommendations on brands/ websites?? they must ship to canada), nor do I know what belts have been replaced and when. What do you recommend checking into first, as ATM its near Christmas and my budget is a little tight and I don't want to have to replace stuff if it isn't a dire emerg.
To be totally clear:

1. The noise is a high pitched squealing sound. Squealing sounds are typically associated with too much friction in a moving part.

2. The car MUST be moving to hear the noise. At what vehicle speed does the sound occur and when does it stop or is overcome by road noise?

3. If this occurs ONLY when the car is in motion (and I presume you revved the engine while stopped) and stops when the car is stopped.

Based on these factors, the sound has nothing to do with the engine and is most likely related to your drivetrain or suspension (the things that only move when the car is in motion). Yet most sounds, especially squealing sounds, are due to engine issues (belts, rollers, fan, leaks, etc.) due to the number of high speed moving and rotating parts.

I suggest to go through the diagnosis phase again to make sure you have your symptoms properly characterized. An inaccurate description will void any possible analysis of your problem.
The noise is only generated when moving. If i lightly press the accel pedal, it will make the noise, however pressing harder down the noise does not generate. This happens cold or hot. I was thinking originally it was my fan...but if it was it would make the sound all the time would it not? just to affirm its only when car is in D, and light acceleration is applied.
1 - 9 of 9 Posts
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