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

Reply
 
LinkBack Thread Tools Display Modes
Old 03-30-2009, 10:53 AM   #1
Registered User
 
Join Date: Mar 2008
Location: Charleston, SC
Posts: 230
Bad O2 sensor kill HP?

I have a bad O2 sensor and when the engine is cold it feels like the car is going into limp mode in the lower rpms and wont go anywhere. Could a bad O2 sensor pull horsepower from the engine? Kind of like going into 'prevent' mode or something?

BoxsterLewis is offline   Reply With Quote
Old 03-30-2009, 12:16 PM   #2
Registered User
 
9eighty6's Avatar
 
Join Date: Aug 2007
Location: South FL
Posts: 253
Hey,

I doubt that a bad 02 sensor would rob the car of HP. My 02 is shot and needs replacement. I have had to drive it to the mechanic's and to work and it still feels normal (though I've not redlined it or pushed it hard). It would have been in 'prevent' mode already for me I'm sure. Might be something else, but I don't know what. Perhaps someone else will chime in.
__________________
1984 - 944 - The first one.
1984 - 928S - The loudest one.
2001 - Boxster - The best one.
9eighty6 is offline   Reply With Quote
Old 03-30-2009, 03:06 PM   #3
Registered User
 
Lil bastard's Avatar
 
Join Date: Feb 2008
Location: Du Monde
Posts: 2,199
A bad O2 sensor can keep the car's dme in closed loop operation which keeps the mixture richer and you'll be down on power because the car selects pre-set fuel maps which do not vary since there's no sensor to send realtime conditions to the dme.

__________________
1990 Porsche 964 Carrera 4 Cabriolet
1976 BMW 2002
1990 BMW 325is
1999 Porsche Boxster
(gone, but not forgotten)
http://i933.photobucket.com/albums/a...smiley-003.gif

Never drive faster than your Guardian Angel can fly!
Lil bastard is offline   Reply With Quote
Old 03-31-2009, 04:06 PM   #4
Registered User
 
Join Date: Mar 2008
Location: Charleston, SC
Posts: 230
Thanks for the info Lil Bastard. I just got mine fixed and it felt sluggish at first but at the end of the drive it started getting peppier. I have a 3.6L in there by the way.
BoxsterLewis is offline   Reply With Quote
Old 05-04-2009, 08:09 PM   #5
Registered User
 
Join Date: Dec 2007
Location: Viriginia
Posts: 32
seems a fine thread to hijack... I cleared some codes the other day... O2 sensors are on their way and just wanted to get rid of that light. I specifically thought to myself on the way out of the neighborhood "this car couldn't possibly be running any better" then i cleared the codes... ever since, right about variocam kick in the car seems to bog. I hope this is the car learning itself back, the code has already returned (driven 100+ miles) but it hasnt seemed to work itself out. Now i am scared to death the clutch is slipping if the O2s dont solve the issue. Is this normal as 02s go out or as codes are reset? i used a OBDII not the battery trick. Any help would be appreciated, i'm not excited about springing for a clutch right now.
Jackelfox is offline   Reply With Quote
Old 05-05-2009, 06:15 AM   #6
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,687
Garage
It could be a bad O2 sensor...OR it could be an O2 sensor reporting another problem. What error codes are you getting?
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
Topless is offline   Reply With Quote
Old 05-05-2009, 07:56 AM   #7
Registered User
 
Join Date: Mar 2008
Location: Charleston, SC
Posts: 230
JAckelfox that happen to me too, right when you think the power is gonna kick in it felt like it died, for me it was my intake not getting enough air due to me using a boxster MAF housing on the 996 motor. Using a 996 housing fixed it right up.

BoxsterLewis is offline   Reply With Quote
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 11:49 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page