Boost dip at 4k

Reply Subscribe

Thread Tools

Search this Thread

10-01-2004, 04:01 AM

#11

WindyCityS4

AudiWorld Super User

Join Date: Mar 2003

Posts: 7,550

Likes: 0

Received 0 Likes on 0 Posts

If it is MTM I see a similar dip.

Reply Like

10-01-2004, 09:47 AM

#12

Superflex

New Member

Thread Starter

Join Date: Nov 2003

Posts: 174

Likes: 0

Received 0 Likes on 0 Posts

Thanks everyone, I'll get 003 tonight, and

I'll also try get knock log, but I'll have to look up which block that is.
Last MAF readings in the summer were well within the range of the sensor.

EGT should be around 900 - 1000 under acceleration, right?

Reply Like

10-01-2004, 10:04 AM

#13

Funkweasel

AudiWorld Super User

Join Date: Nov 2001

Posts: 10,132

Likes: 0

Received 0 Likes on 0 Posts

Your egts will get pretty high on the stock chip but otherwise they'll be in the mid

800s. The knock voltages can be found in blocks 026 and 027. Pay closest attention to cyls. 2 and 5.

Reply Like

10-06-2004, 04:26 PM

#14

Superflex

New Member

Thread Starter

Join Date: Nov 2003

Posts: 174

Likes: 0

Received 0 Likes on 0 Posts

OK, been logging...

<center><img src="http://pictureposter.audiworld.com/64721/o2_voltages_10-6-04.jpg"></center><p>
And I couldn't find any traces of throttle cut or excessive timing retard (up to 3 degrees of retard once on 92 octane, but usually none).

I discovered some wacky plots when I went to look at O2 voltage though.

Unfortunately I don't know enough about these plots to diagnose. Is it a bad Sensor 2 on Bank 1? Looks a little lazy. I also had a DTC about internal resistance too high, but I accidentally cleared it before writing it down.

Thanks for any help you can give!

Reply Like