A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

engine knocking fixed easy!

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Old Oct 6, 2006 | 11:18 AM
  #1  
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Default engine knocking fixed easy!

for years my '97 has had this knocking noise from the engine (like a sewing machine), heard when the windows were up and idling.
i attributed it to the age/ mileage, and feared for the worst. finally when getting the oil change i stuck the mechanic in the car to show him.
he walked in front of the engine with me, and unplugged the PURGE VALVE. after he restarted the car, the noise was totally GONE purge valves, he said, seldom throw a light if they aren't totally shot, but will easily echo through the car's interior.
$110 vs. $3000 (although technically it wasn't the 'engine')

it's been an awesome CAR day today...good news seldom comes this way!
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Old Oct 6, 2006 | 11:26 AM
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Default $110 to unplug a purge valve

:-)
I'm sure you calculated in your oil change, etc....
Just goes to show you - always look for the easy stuff first
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Old Oct 6, 2006 | 12:03 PM
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Default Re: i should'a clarified..it was replaced

so the oil change was on top of that. don't tell me it could've been cleaned.
DOH!
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Old Oct 6, 2006 | 12:48 PM
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Default

nah, I think a replacement is the normal fix - you did good.
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Old Oct 6, 2006 | 07:49 PM
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Default

where is the purge valve located?
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Old Oct 7, 2006 | 12:00 PM
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Default on top of the airbox, but under the fancy black cover that pops off

has a couple hoses going to and from it.
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