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Strange noise at first start

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHStrange noise at first start

Leading reported evidence

Replace with revving the engine

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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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.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
Does your sound change with revving the engine?
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Strange noise at first start

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Leading evidence: 'Replace with revving the engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace with revving the engine' (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 matching discussions · 5 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Replace with revving the engine

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 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.

Suggestion
Does your sound change with revving the engine?
Original post Read captured discussion
Strange noise at first start

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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.

5 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: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My 99 C2 started making a fluttering sound when first started. Almost sounds like a stick in a fan. Car has 111,000 miles. Lasts for a second at most. Any idea what causes this? It only does it if the car has been sitting for a while. Does it first thing in the morning. Thanks mike

POST 2Original post

My car makes a similar sound I think. I'm thinking the tappets (lifters) are making noise until oil reaches them. The noise disappears in 20 seconds or so. I'm hoping its somewhat normal. Does your sound change with revving the engine?

POST 3Original post

Best bet is to post a video (or at least audio) of the car starting up. "Fluttering" doesn't really give us enough to go on. "Stick in a fan" that goes away in less than a second sounds like chain slap. As for trapper, if it sounds like lifters ... it's probably lifters.

POST 4 / ORIGINAL POSTEROriginal post

What causes chain slap? It's literally a second or less. No chance to even rev it. Mike

POST 5Original post

Quotes source post: 10561022

The chain tensioners aren't quite getting the job done so there is a little bit of slack in the chains prior to hydraulic pressure charging up. What your hearing is the sound of one or both chains touching the chain guides. It sounds quite like a bicycle chain slapping the guard rail and is considered perfectly normal on higher milage examples.

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