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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHStrange sound with acceleration
Reported or suspected cause
worthless, 2nd trip i purchased an entire socket set
Reported cause
No successful repair reported for this finding.
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Discussions that report identifying a cause
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Reported cause · Original poster
(1st trip I purchased an adjustable socket wrench that turned out to be worthless, 2nd trip I purchased an entire socket set because it was literally the only thing to include a 24mm socket, 3rd trip I purchased a 1/2inch drive breaker bar after realizing I only have 3/8th drive sockets and no adapter),
Leading evidence: 'worthless, 2nd trip i purchased an entire socket set' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'worthless, 2nd trip i purchased an entire socket set' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check also wheel bearings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
The belt was in good shape, no fraying or anything, all the pulleys and rollers moved freely without any lateral play and I ran the car for about 20 seconds to pull it out of the garage, turn it around and pull back in.
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Check oil (level) of differential and transmission
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Suggestion
Check the oil (level) of differential and transmission.
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Performed · outcome unconfirmed · Original poster
The belt was in good shape, no fraying or anything, all the pulleys and rollers moved freely without any lateral play and I ran the car for about 20 seconds to pull it out of the garage, turn it around and pull back in.
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worthless, 2nd trip i purchased an entire socket set
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause · Original poster
(1st trip I purchased an adjustable socket wrench that turned out to be worthless, 2nd trip I purchased an entire socket set because it was literally the only thing to include a 24mm socket, 3rd trip I purchased a 1/2inch drive breaker bar after realizing I only have 3/8th drive sockets and no adapter),
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
40 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T091943Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
https://youtu.be/jwX-eA88U98
Hey guys, so since having the car back its been running great. I did however notice a strange sound when accelerating at low speeds with the top up. I'm guessing I just can't hear it over everything else at highway speeds or when the top is down. I did my best to record the sound. It does not make the sound if I simply rev the car. Only when driving and accelerating. I don't mean the whine of the engine either, it's something else I can't even think of how to explain it.
It's the kinda whamp whamp whamp that's high pitched and very faint in the video when I accelerate.
Call Dennis, I'm sure he'll be happy to completely disassemble the tranny and pass the blame on a completely unrelated component. He'll tell you that you must have this done quickly because the end of world could happen by the end of the week. (Snicker)
Seriously KK, I've listened to your video and man, that is a weird sound. Of course, my '03 cab is a manual, but it has never generated a weird ghostly sound like that. Why not call Gabe and get his opinion before it's too late.
Hi Dennis C, that wasn't meant for you. hahaha. It's regarding a unbelievable experience that involves KK and a man named "Dennis the Menance, the Tranny Prophet".
No sound in the clip jumps out at me.
Even when sounds are distinct enough to hear in one of these clips the diagnosis is always a guess.
If there is a noise and I'm not say there is or there isn't, it can arise from a number of causes: There can be a bad tire, wheel bearing, half shaft CV bearing, a loose brake pad, and so on. Once I heard a noise at highway speed and found a wheel liner had come detached at the front and the wind at speed was forcing the liner to the pavement to where it was rubbing on the pavement -- and being ground away -- and I was hearing that noise.
My advice is if you have a trusted Porsche tech to ask him to road test the car and let him hear the noise and advise you.
I troubleshooted over the phone with Gabe and he thinks it could be a roller pulley or belt based on when it makes the noise, what makes it worse etc.
Noise seems to match engine speed and it does occur in neutral while coasting.
Is replacing the serpentine belt something j should be able to do fairly easy on my own? I figured I could do that myself and see if the noise goes away.
So to break it down again:
- Noise only when moving and in gear.
- No Noise when revving at standstill in neutral.
- Noise happens if moving but in neutral as well.
- Noise matches engine speed.
Based on these symptoms, you might be wasting your time replacing the serpentine belt. If it was that, you'd hear it regardless if you were moving or at a standstill.
I personally can't hear the sound from the vid. It might be helpful if you have a go-pro or something similiar to attach on the outside maybe?
It's possible that your previous place(Dennis) messed up the wheel bearing(s) as someone has pointed out.
^ You can run the car VERY BRIEFLY without the belt - there will be no coolant circulating with the belt off, so if you do this, do it when the car is cold.
It definitely doesn't sound like a bad wheel bearing to me. Gabe was able to hear the noise on the video and he described it as a whirring sound lower pitched than that of the engine whine
Changing the belt is really simple. Photograph or make a drawing of the belt travel before taking it off. Good time to also spin all pulleys and accessory's by hand to see if there is any lateral movement, grinding or loose play.
Okay, so I got tired of waiting and after 3 trips to Walmart to get the right damn socket
(1st trip I purchased an adjustable socket wrench that turned out to be worthless, 2nd trip I purchased an entire socket set because it was literally the only thing to include a 24mm socket, 3rd trip I purchased a 1/2inch drive breaker bar after realizing I only have 3/8th drive sockets and no adapter),
I was able to remove the serpentine belt. The belt was in good shape, no fraying or anything, all the pulleys and rollers moved freely without any lateral play and I ran the car for about 20 seconds to pull it out of the garage, turn it around and pull back in. The noise is still there regardless of the serpentine belt.
So i believe that effectively rules out the belt/pulleys.
How many times the shaft was disconnected and connected from the tranny. Maybe something went wrong there by an inexperienced mechanic touching your car.
To me a logical explanation could be that the (inner) cv joint bearing(s) of a shaft were in some way forced during the mount/dismount process earlier on. Could explain the noise upon acceleration.
I got a similar diagnosis for the outer cv joints when a new suspension was mounted. So my guess is yours has te be related to the mounting of the transmission. A bad bearing down the drive train is a good suspect.
Check also wheel bearings, check differential. Check the oil (level) of differential and transmission.
So here's where I am so far. My local PCA has recommended a Porsche Savant so I have an appointment Friday.
However, due to the many people betting on the snow tires (and the fact I've been meaning to replace them since before the stupid shifter issue) I've ordered some new tires and should have them put on tomorrow.
What are the OEM tire sizes by the way? TireRack specified 225s on the front and 285s in the back, but the tire shop pulled up in their computer 225s in the front with 265s in the rear for the 18s.
I know there is wiggle room but I just wanted to stick to OEM.
Hey KK,
My Porsche book states that 285/35/18 are correct OEM rear size for the MkII 996 narrow body. The OEM size for the MkI narrow body was 265/35/18 for the rear. Slakker's car is a MkI which makes sense that he'd use 265.
Cheers
Well I'm happy to report great news! After talking with my local PCA an Indy about 20 something minutes from me was recommended. This guy was drscribed as a Porsche savant.
I talked with him about a week or so ago and he said he wouldn't want to chase any strange sounds on the car until I had proper rubber on them. So I got some brand new summer tires and found the sound still there if not louder.
I took the car to him yesterday and he found an aluminum oil cooler line was damaged (most likely during Dennis' "repair" of my transmission. He fixed the line and the sound is gone. He also found that the front sway bar links were bad and is replacing them as well.
I should be picking the car up tomorrow after work. I can't wait to be able to enjoy my car finally!
Not that it matters, but in case someone sees this in the future - a minute or two, some amount of time less than it would normally take the car to heat up and for the thermostat to start opening to let coolant circulate to the radiators.
Can you share more information on why the hard line was causing the whirring sound you described? Was it contacting a moving part, or...?
Congrats on having a SOLID resource for future troubleshooting/diagnosis. Knowing you have someone available who won't just shrug and start throwing parts at your car is a tremendous asset.
That's great news! Glad to hear you have someone that you can trust to do the right job and not completely disassemble the engine and blame it on a non-related part.
Are you going to reconstruct your original transmission that Dennis the Menace destroyed while he was playing?
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