22 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLet's play...name that ticking noise!
Leading reported evidence
Run " upon initial start
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Run " upon initial start' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run " upon initial start' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
22 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: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Short drive this morning. Just for fun (and paranoia) I had a listen to the running engine. Heard what sounded like a fast paced ticking sound under the lid.
Opened it up, sounds like it was coming from near the alternator and/or serpentine belt.
Any internet diagnoses from the well educated folks on this forum?
IMG 8491 - YouTube
Turn off the car, remove the serp. belt, and start the car again (briefly). If the sound is still present, you know it's not one of the accessories. If the sound is gone, shut the car back off and spin each accessory (and pulley) by hand to see if you can identify which one might be acting up.
Note that you may not hear the sound he's describing on computer speakers - I could only hear it when I switched to headphones. It sounds much too fast to be an accessory - it's a high-pitched clicking at - guessing - 3-5 hz. Almost like a tazer. Weird.
Could be I guess. Almost sounds more electric though, a buzzing sound.
EDIT: Found a note from Jake last year that said:
"I pay more attention to the rhythm of the noise than anything else.
Lots of the small ticks that are heard rapidly as from fuel injectors. DFI engines have very loud injectors.
One thing is for sure, within an engine no noise is a good noise."
So perhaps the injectors. Small rapid ticks!
I agree completely. It should only "run" upon initial start. Meant to clear collected fumes in the evap system that collects while the car is sitting and not running.
Actually, I was a little bit wrong on that - In modern cars, the purge valve is an electrically-operated solenoid, that is controlled by the engine computer. When the engine is off, the purge valve is closed. When the engine is running and fully warmed up, the engine computer gradually opens the purge valve to allow some amount of fuel vapor to be moved from the charcoal canister to be burned in the engine. The purge flow is monitored by a number of sensors. If the purge flow is less or more than is expected under the conditions, the computer illuminates the "Check Engine" light.
Exactly. Also, the duty cycle of the PWM signal of the valve depends on a lot of factors such as how full is the vapor canister. The flow is monitored by the O2 sensors, combined with MAF measurements.
Bottom line: the on/off and clicking freq may appear random.
Woodman71, you better not upgrade your stereo as you'll now probably hardly use it as you'll be zeroing in on any potential noises the car could make.
Holding a conversation with the wife during riding in the 996: "SSSHHHHH...Honey did you hear that?" - "Hear what?" - "Hear that? Don't you hear it? Listen carefully... Try holding your breath for a moment.... Hear it now?"
