S4 Throttle Body Hose:
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Ruptured intake hose: the tear was nearly 1-3/4" long! |
For about a week the car was surging under heavy load and feeling generally "unfrisky" compared to normal. "Bad gas" I postulated although I was planning to hook up my scanner and check for engine codes despite that the CE light was not glowing. Then, while heading out to lunch one fine day the car started running like a total dog. If I leaned on the throttle I could hear air rushing under the hood. I knew immediately an intake hose somewhere had failed or blown off. I had read a few things online about a weak hose--my gut told me that was my problem. A quick inspection confirmed the hose was ruptured. Damn.
I stopped at the dealer. I'd heard that availability was a problem with this hose so I checked with the parts department before admitting my baby to the service department--the part was on intergalactic backorder. None in the US and not available for 4-6 weeks due to a part change I was told. OH MAN!! I made a few phone calls... luckily, APR had one in stock. I bought one from them and installed it myself. I can see the email already... why did you buy the part yourself when the car is obviously under warranty? Quite frankly, for a $7.80 it wasn't worth the hassle waiting for the dealer to dig up the part and the pain of being without my S4 when one was readily available to me. Yes, I suppose I should push to be reimbursed for the part.
Install time: about 20 minutes including taking pictures.
The boot has been replaced by a new part that sells for $11.80 instead of $7.80. I have both the old and new part number boots. There is no visible difference between the two... apparently, the difference is in the rubber compound.
Btw, replacing the hose did not reduce the low rpm turbo "whirring" noise some have asked me about. The hose was not contributing to this normal noise.
Revised
Audi has released a technical service bulletin regarding the throttle body boot failures. The revision uses the 356T boot and redesigned clamps. Complete info may be found at http://tech.vw.com/audi/newtech.htm. See bulletin # 01-00-04. Adobe Acrobat reader is required to view the service bulletins. The bulletin calls for 4 new clamps. So far I've only replaced the main clamp on the throttle body opening--the others were not yet available.
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Boot original part # |
078-133-356L |
Boot new part # |
078-133-356T |
New main clamp# |
078-133-343 |
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The two failures below were replaced without using the new clamps (revised clamps were not announced at the time). So, simply replacing the boot is only 1/2 the battle.
Revised Boot Failure! |
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Remove the "V6 Biturbo" cover to discover
the throttle body and the throttle boot lurking within |
To replace the hose:
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