Let's play...name that ticking noise!
#1
Rennlist Member
Thread Starter
Let's play...name that ticking noise!
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?
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?
#3
Race Director
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.
#4
Race Director
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.
#5
Rennlist Member
Thread Starter
Thanks 5CHN3LL, that is spot on. Fast and high pitched.
#7
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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!
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!
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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.