2001 A4 Detonation problem

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Feb 4, 2002 | 12:43 PM

#21

Dr. X

8th Gear

Joined: Nov 2001

Posts: 8

Likes: 0

From: Norwood MA

Re: 2001 A4 Detonation problem (Loadtoad)

Buy an OBDII Scan tool (like Autotap). It will tell you if you have knock retard, how much, if you are running lean (shouldn't be if you are stock), if you are getting misfires (the only reason to change spark plugs, IMO), etc. It will be money well spent. Then, when you hit a brick wall like I did with this same problem, try doing Steven MH's PCV system mod. Cheap, easy, reversible, and it works!

Feb 9, 2002 | 06:45 PM

#22

Loadtoad

Thread Starter

Racer

Joined: Sep 2001

Posts: 341

Likes: 0

From: WY

Re: 2001 A4 Detonation problem (Dr. X)

UPDATE

Just finished replacing my puckless factory plugs with the NGK's and the factory wires are gone in place of the Magnecor's.
Took the car out for multiple runs from 0 to 100 and the detonation problem is now gone! I have yet to get the PCM reprogramming completed but now I am in no rush. Thank you all for yor assistance!
:seeya

Feb 9, 2002 | 11:49 PM

#23

Closer_2001

Melting Slicks

Joined: Mar 2001

Posts: 3,254

Likes: 61

From: League City TX

Re: 2001 A4 Detonation problem (Loadtoad)

Has anyone changed the plugs without changing the wires and seen similar improvements?

Feb 10, 2002 | 01:54 AM

#24

CAracer

Pro

Joined: Nov 2001

Posts: 731

Likes: 26

From: Austin TX

Re: 2001 A4 Detonation problem (Closer_2001)

I changed the plugs fiirst and found some improvement. I also switched to Chevron gas which pretty much eliminated the detonation problem. I really don't understand why the knock sensors are not working. I feel no loss in power when the motor is detonating. If the sensors were doing there job, I would think I would feel some loss of power when the motor starts rattling.

Feb 10, 2002 | 03:33 AM

#25

OhNiner

Race Director

Joined: Nov 2001

Posts: 10,143

Likes: 0

From: Retired USCG North Georgia

Re: 2001 A4 Detonation problem (Patches)

Quote:

C-5 TECH,

How recent is this calibration? Is it something that would apply to my 2002 coupe, built October 23, 2001?

Ed

My 02 was built late in 2001 and I have pinging also. Is there an update possibly for my car also?

Feb 10, 2002 | 10:10 AM

#26

0vetteshop

Former Vendor

Joined: Apr 2001

Posts: 10,976

Likes: 21

From: FL

St. Jude Donor '13

"My 02 was built late in 2001 and I have pinging also. Is there an update possibly for my car also?"

If you E-mail me your VIN #,I can check for any updates...

Any one with a 2001 should have the updated calibration installed...It improves shift quality,addresses spark knock,and corrects the lack of power issue when downshifting...I have done a few,and the best I can describe is that the vehicle feels "crisp" under acceleration...The improved shift quality seems to prevent the trans from dumping into the wrong gear under hard acceleration,with any traces of spark knock gone...

Feb 10, 2002 | 12:02 PM

#27

0vetteshop

Former Vendor

Joined: Apr 2001

Posts: 10,976

Likes: 21

From: FL

St. Jude Donor '13

Re: 2001 A4 Detonation problem (Gardiner)

Here is the calibration update for the 2002...

Calibration History for :NEW SOFTWARE Part Number CVN Bulletin # Description
12221588 N/A N/A new software to address deceleration stalling. replaces 12212156

--------------------------------------------------------------------------------
Calibration History for :ENGINE CALIBRATION Part Number CVN Bulletin # Description
09358584 00009AC6 N/A engine calibration
09358660 0000C172 N/A new calibration to reduce spark knock

--------------------------------------------------------------------------------
Calibration History for :ENGINE DIAGNOSTIC CALIBRATION Part Number CVN Bulletin # Description
09358961 00003EE7 N/A engine diagnostic calibration
09359040 000015FB N/A calibration to prevent setting of false dtc p1133 and p1155

--------------------------------------------------------------------------------
Calibration History for :TRANSMISSION CALIBRATION Part Number CVN Bulletin # Description
09358322 0000985A N/A transmission calibration

--------------------------------------------------------------------------------
Calibration History for :TRANSMISSION DIAGNOSTIC CALIBRATION Part Number CVN Bulletin # Description
16264441 00002853 N/A transmission diagnostic calibration

--------------------------------------------------------------------------------
Calibration History for :FUEL SYSTEM CALIBRATION Part Number CVN Bulletin # Description
16264675 000016C0 N/A fuel system calibration
16264703 0000F152 N/A calibration to prevent setting of false dtc p1431

--------------------------------------------------------------------------------
Calibration History for :SYSTEM CALIBRATION Part Number CVN Bulletin # Description
09373565 0000B7CC N/A system calibration

--------------------------------------------------------------------------------
Calibration History for :SPEEDOMETER CALIBRATION Part Number CVN Bulletin # Description
09362157 00009F6B N/A speedometer calibration
09362197 00009A2A N/A calibration to correct rtd failure mode not controlling to specified speed

[Modified by C-5 TECH, 11:03 AM 2/10/2002]

Feb 18, 2002 | 12:29 AM

#28

OhNiner

Race Director

Joined: Nov 2001

Posts: 10,143

Likes: 0

From: Retired USCG North Georgia

Re: 2001 A4 Detonation problem (C-5 TECH)

Quote:

Here is the calibration update for the 2002...

Had the dealer perform the update but it is still pinging at WOT. I thought I would run this tank of fuel out and try fuel from a different station. I use BP gas, should be good.