[Biturbos4] Hesitation...Check OBD light

Erik De Bonte Erik.DeBonte at microsoft.com
Mon Jul 23 00:43:55 EDT 2007

I had similar symptoms (minus the belts) a year or so ago.  Did the Check Engine light finally go on under load (higher load than when you were getting the hesitation)?

In my case, I hooked up VAG-COM and found that some of the cylinders were misfiring.  My mechanic wasn't able to find anything that looked like the cause, so he swapped the spark plugs side-to-side (to see if the failing cylinders swapped too) and applied some sort of contact enhancer to the ignition control module.  The problem hasn't occurred since then, so I guess the contact enhancer fixed it.  Can't say whether this is a common problem though.

Maybe find someone local to you with VAG-COM?


2001 Audi S4
2000 Volvo V70 R

-----Original Message-----
From: biturbos4-bounces at www.audifans.com [mailto:biturbos4-bounces at www.audifans.com] On Behalf Of Jason Cavaliere
Sent: Sunday, July 22, 2007 2:06 PM
To: 'Biturbos Qlist S4 / Quattro'
Cc: 'Biturbos Qlist S4 / Quattro'
Subject: [Biturbos4] Hesitation...Check OBD light

Hello everyone.

My wife and I just got back from a 250 mile road trip, and at the very end,
the check OBD light went on.  On the trip, I had been noticing the car
hesitating (feeling like power was going 'on' and 'off) around 4k rpm, only
under very light load.  Light load meaning keeping a constant speed up a
small incline.  It felt like I was taking my foot on and off the gas pedal.

I don't know if the two symptoms are related, and I remember this hesitation
before this road trip.  I remember it after I put an OCT chip in the car,
but I faintly recall it before the chip (I only drove the car a few hundred
miles before I chipped it).

Also, I've noticed some belt noise towards the front of the car, louder when
the car is cold, but still present when car is warm. The car has 58k miles,
milltek exhaust, K&N filter, and OCT chip.

Any ideas? Been there done that?

I'd love to be able to check the OBD codes myself...

00 S4
81 911

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