13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHigh-pitched whirring on cold start
Leading reported evidence
Repair their 2003-ish e36 mercedes
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
I took a look at other forums and found an article where someone repaired their 2003-ish E36 Mercedes that seems to have an identical pump (including the components in the inside based on the pictures he posted).
Leading evidence: 'Repair their 2003-ish e36 mercedes' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Repair their 2003-ish e36 mercedes' (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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1
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Suggestion
Either replace the SAI pump, or if you are a real DIY'er rebuild/replace just the bearings.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Using your Bosch part #, I see that AutohausAZ has it for $376.00
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Repair their 2003-ish e36 mercedes
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
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.
Performed · outcome unconfirmed · Original poster
I took a look at other forums and found an article where someone repaired their 2003-ish E36 Mercedes that seems to have an identical pump (including the components in the inside based on the pictures he posted).
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.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T142254Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Dear Rennlist members,
On every cold-start of my 2003 911, I hear a high-pitched whirring sound almost like circular saw was running in the engine bay. The sound stops after approx. 1 minutes but I can briefly hear it start again it when I come to a standstill (e.g. stoplight). Not sure if this is normal or something to be worried about, I am attaching a recording that shows the moment the sound stops. I did a video of the engine bay too, but it seems Rennlist doesn't let me upload it, let me know if the video would help diagnose the issue, I will look for a way to add one.
Please let me know if I should take the car to the service or if I am worrying without any reason!
Cheers,
Andy
Your secondary air injection pump has a bearing going bad.
Either replace the SAI pump, or if you are a real DIY'er rebuild/replace just the bearings.
No it will not cause the engine to "explode", you can even just unplug the noisy pump, but you will fail emission testing...
Quick update on this:
I took the pump apart, but couldn't open the motor housing as it is sealed. I also found carbon in the motor, I guess the brush is used up. I took a look at other forums and found an article where someone repaired their 2003-ish E36 Mercedes that seems to have an identical pump (including the components in the inside based on the pictures he posted). FCP Euro has the Mercedes-certified version in stock for approx $400, around $100 cheaper than the cheapest pump I found for the Porsche. I ordered it and will see if it is the same part:
https://www.fcpeuro.com/products/mer...sch-0001407085
For comparison, here is the link to Pelican with the same pump:
https://www.pelicanparts.com/More_In...hoCh9cQAvD_BwE
Good to know!
Using your Bosch part #, I see that AutohausAZ has it for $376.00
https://www.autohausaz.com/pn/0580000017
And a URO branded one for $165.00.
https://www.autohausaz.com/pn/UR-0001407085
Or a bottle rolling around in the frunk.
