TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

CEL Help please!

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Old Dec 8, 2004 | 01:46 PM
  #1  
Case WesTTern's Avatar
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Default CEL Help please!

2001 225 QC unmodded.
CEL went on this morning. Solid CEL, not blinking. Has been on all day.

When i get on the gas, the spool is louder, and when i let off the gas at around 4k, i hear a loud fluttering. Sometimes I hear something go CLANK!

any help would be appreciated.

TIA
rk
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Old Dec 8, 2004 | 01:51 PM
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Better get to the dealer pronto. Isn't that an 'idiot light'
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Old Dec 8, 2004 | 01:54 PM
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Default A possibility

Similar thing happened to me a while ago. I heard a fluttering sound every time I let off the gas. It got progressively louder every day. Turns out it was the combination valve. I never heard any loud clank or anything so maybe it's something different. But I just wanted to throw that out there...good luck!
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Old Dec 8, 2004 | 01:56 PM
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Default my guess would be a busted diverter valve

probably causing a boost leak.
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Old Dec 8, 2004 | 02:01 PM
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whats a combination valve?
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Old Dec 8, 2004 | 02:10 PM
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Default A faulty DV....>

Will do that (don't know about the clank though.) The fluttering is compressor stall, from the DV not opening and spilling boost on vacuum....
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Old Dec 8, 2004 | 02:18 PM
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Default Uhhhh....

not exactly sure. Has something to do with mixing oil and air...or something like that. Anyway, I thought it was the DV at first, too, but it wasn't. I felt a little power loss, too. Kinda seemed like it made sense that the DV went bad...I was surprised it wasn't that. Is your car still under warrranty? Take it to the dealer...they'll tell you what it is.
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Old Dec 8, 2004 | 02:20 PM
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Default Actually I recently had the same problem but with my Volvo--->

'92 960, 90k miles. Cost me about $500 and they replaced all kinds of sensors and switches. All made sense to me. Thing is, it could be anything. Generally emission related according to the svc mgr. But Forum guesses are just guesses. Get it to the dealer before it blows up............. No ****!
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Old Dec 8, 2004 | 02:33 PM
  #9  
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Well I guess my first mod is on the way. How is the Hypberboost HX?
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Old Dec 8, 2004 | 02:47 PM
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Default Is there such thing as a back pressure valve on the TT ?

My Lotus had one for low-RPM boost build up.
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