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84 is eating O2 sensors
Anybody had their N/A eat O2 sensors every couple months? I have been having a rich mix for a while and have replaced the O2 sensor 3 times now in 5K miles. It is dead again. I have used a stock one and 2 generics from Auto Zone. I have done a few things to the engine but nothing too crazy. I am running MSDS headers and a mini cat. The O2 sensor is in front of the cat in the threaded hole on the header. Any ideas???
Steve
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84 944 (my favorite all time car) 98 M3 (the wife's) ML55AMG 03 Eurovan 00 Land Rover Disco II |
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06-22-2008, 03:54 AM
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Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
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It probably isn't the O2 sensor. If it's running rich there is another reason. What diagnosis have you done? The car will run with the sensor disconnected anyway.
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From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
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06-22-2008, 09:00 AM
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I have a quick disconnect and have measured the voltage from the DME @ right @ 4 volts. All of the O2 sensors have been at least outputting voltage in the 4-5 volt range when installed. I have adjusted the A/F to get close then after a couple hundred miles it is rich again and the output voltage from the O2 sensor is essentially 0. If I stick a new one in it again gives me an output. I am at a loss. I also am not the sharpest tool in the shed and am receptive to ideas.
Steve
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84 944 (my favorite all time car) 98 M3 (the wife's) ML55AMG 03 Eurovan 00 Land Rover Disco II Last edited by shikzachaser; 06-22-2008 at 03:01 PM.. |
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06-22-2008, 02:56 PM
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Join Date: Oct 2005
Location: San Diego
Posts: 703
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FPR or Sticking Fuel injector??
Get Injectors Cleaned could be a start. Vacumm test on FPR to see if it holds perssure. AFM worn contact?
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles |
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06-23-2008, 06:24 AM
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