Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 12-29-2016, 01:07 PM   #1
Registered User
 
More's Avatar
 
Join Date: Sep 2012
Location: Sydney
Posts: 347
Battery Malfunction

Hello

I disconnected the battery from the car for a few weeks and when I reconnected it and put the key in the ignition and turned it on I could hear it computing and then I noticed it added an extra 4000 KMs to my total.

Is there anyway I can turn it back?



__________________
1998 Porsche Boxster 986 Convertible.
More is offline   Reply With Quote
Old 12-29-2016, 02:49 PM   #2
Registered User
 
Join Date: Dec 2013
Location: Florida
Posts: 45
No you can't. It should not have done that. The mileage is stored in the dme. Don't know why it would randomly add mileage.

Sent from my SAMSUNG-SM-N920A using Tapatalk
mmassey0125 is offline   Reply With Quote
Old 12-29-2016, 08:21 PM   #3
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Quote:
Originally Posted by More View Post
.. put the key in the ignition and turned it on I could hear it computing...
You heard it computing? Can you explain in more detail?
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 12-29-2016, 09:22 PM   #4
Registered User
 
More's Avatar
 
Join Date: Sep 2012
Location: Sydney
Posts: 347
I could hear little tiks and tacs coming from the dashboard as the on board computer works everything out.
__________________
1998 Porsche Boxster 986 Convertible.
More is offline   Reply With Quote
Old 12-30-2016, 05:33 AM   #5
Registered User
 
Join Date: May 2016
Location: Northville, MI
Posts: 249
Quote:
Originally Posted by mmassey0125 View Post
No you can't. It should not have done that. The mileage is stored in the dme. Don't know why it would randomly add mileage.

Sent from my SAMSUNG-SM-N920A using Tapatalk
I agree, something is fishy here, there is no way it would just add a random amount. Either someone was driving the car while the OP was unaware of it or he is just trying to find out how to turn the mileage back, sorry to be so suspicious but that is just not plausible.
bwdz is offline   Reply With Quote
Old 12-30-2016, 06:28 AM   #6
There Is No Substitute.
 
rick3000's Avatar
 
Join Date: May 2007
Location: West Coast
Posts: 3,253
Garage
I had a very unusual odometer malfunction, where after disconnecting the battery and reconnecting the odometer reset back to zero miles, zero everything. However, by disconnecting/reconnecting again it went back to normal. I would try disconnecting the battery again, after that I would check the instrument cluster connectors are seated correctly.

If I recall correctly, the odometer is stored in the instrument cluster, and nothing can roll back the mileage not even a Porsche dealer once you pass, I think its 100 miles on the odometer. If the car did actually add miles there is no way to get rid of them. There is no computer in the dash, it is under the seat. What you probably heard was the AC recalibrating itself, there are flaps to redirect the airflow in the dash that will make some noise. The car won't just add a random number to the odometer, perhaps someone has been joyriding?
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
rick3000 is offline   Reply With Quote
Old 12-30-2016, 07:03 AM   #7
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Quote:
Originally Posted by More View Post
I could hear little tiks and tacs coming from the dashboard as the on board computer works everything out.
The DME (aka ECU, aka engine computer) is in the rear trunk.

The immobilizer (aka car alarm) is under the driver seat.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor

Last edited by thstone; 12-30-2016 at 07:08 AM.
thstone is offline   Reply With Quote
Old 12-30-2016, 07:10 AM   #8
Registered User
 
Chuck W.'s Avatar
 
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
The mileage readout can easy be reset with the right equipment. When I installed a 996 cluster I sent it off to a company in Colorado (ODO-PRO.COM - Odo-Pro.com - The Digital Odometer Professionals) to have the mileage readout changed to match the Boxster's. I cannot speak to other years, but the 2001 Boxster S mileage is stored in the cluster and only the cluster. The hours the engine has run are stored in the DME, but not the mileage.

I have read other issues with digital odometers malfunctioning. The OP very likely suffered some software malfunction. I like rick3000's idea of disconnecing and then reconnecting the battery in an attempt to get the correct mileage back.

Keep us posted.
__________________
1995 Porsche C4 Cab

2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD
Chuck W. is offline   Reply With Quote
Old 12-30-2016, 07:22 AM   #9
Custom User Title Here
 
particlewave's Avatar
 
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,163
Garage
Quote:
Originally Posted by bwdz View Post
I agree, something is fishy here, there is no way it would just add a random amount. Either someone was driving the car while the OP was unaware of it or he is just trying to find out how to turn the mileage back, sorry to be so suspicious but that is just not plausible.
Wrong. Mileage errors on the cluster are not uncommon and More is not trying to do anything "fishy".




Quote:
Originally Posted by thstone View Post
The DME (aka ECU, aka engine computer) is in the rear trunk.

The immobilizer (aka car alarm) is under the driver seat.
And the OBC (on board computer) is in the cluster. The mileage is stored there (and possibly the ECU and immobilizer).

Try disconnecting the cluster for a few minutes and see if that helps.

particlewave is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 10:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page