Purring Sound Coming from Engine Bay - What is it?
#1
AudiWorld Member
Thread Starter
Purring Sound Coming from Engine Bay - What is it?
Ever since I took the car in for my fuel line recall and had all the updates done to it I've had a low purring sound coming from the engine bay at low RPMs. It sounds like it's coming from the passenger side. Even my wife heard it the other day and asked about it - and she has no ear for car related noises.
Anyone ever had this? It's kind of annoying.
Anyone ever had this? It's kind of annoying.
#5
AudiWorld Member
Thread Starter
It does. However when the RPMS go beyond, IDK, about 2000 the pulses are too fast and no longer audible. It also does it intermittently. When the cooling fan is on I can't hear it. I haven't used the heater this year, it's barely been below 70 deg so far in South Florida.
#6
AudiWorld Super User
It does. However when the RPMS go beyond, IDK, about 2000 the pulses are too fast and no longer audible. It also does it intermittently. When the cooling fan is on I can't hear it. I haven't used the heater this year, it's barely been below 70 deg so far in South Florida.
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#8
AudiWorld Super User
The alternator, serpentine belt, belt tensioner and idler roll are all down low on the passenger side of the engine. It could be a roller bearing or the alternator is making noise due to the increased load at low RPMs.
Ordinarily I would say to remove the belt to see if the noise is internal or external but it doesn't look too easy to remove. It appears that there is an adjuster on the bottom side of the tensioner assembly. They might be able to tighten/loosen to see if the noise changes.
Ordinarily I would say to remove the belt to see if the noise is internal or external but it doesn't look too easy to remove. It appears that there is an adjuster on the bottom side of the tensioner assembly. They might be able to tighten/loosen to see if the noise changes.
#9
AudiWorld Member
Thread Starter
UPDATE: Just picked up the car from the dealer. Apparently when they performed the fuel line recall something didn't go back in right. The repair sheet claims they "removed, replaced, and refitted the fuel line bracket, rattling was coming from the fuel line rubbing against the fuel line bracket." Shows they replaced a bracket and a couple of clips.
#10
Well done! Now hopefully the only purring is that of 4 contented liters of pure automotive happiness!