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Join Date: Jun 2002
Location: New Hampshire
Posts: 724
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3.6 running rich
Does anyone know how the air/fuel mixture is adjusted on these? Is there an adustment or is it all done with the chip?
Tom
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Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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08-21-2006, 07:16 AM
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Location: Encinitas (San Diego CA)
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Asssuming it is stock 993, it is all done with the chip. Your O2 sensor(s) could be shot, though, which would make the system slow(er) to respond.
Also, there may be a limp home mode, if your system isn't getting all of the sensor inputs properly. What are your AFRs? Doug
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1971 RSR - interpretation Last edited by DW SD; 08-21-2006 at 07:59 AM.. |
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08-21-2006, 07:22 AM
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Location: Novato, CA
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If it's a 964 based 3.6 it has an air flow meter that can be adjusted.
Joe |
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08-21-2006, 07:53 AM
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It is a 964 model. The O2 sensor was brand new when installed the beginning of last season.
Tom
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Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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08-21-2006, 09:32 AM
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How can you tell it's rich?
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08-21-2006, 08:11 PM
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I too wonder how you came to the conclusion that it runs rich. Have you used a wideband O2 sensor such as the LM-1? Cheers, Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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08-21-2006, 10:28 PM
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Irrationally exuberant
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Hi Tom,
I just happen to have a wideband O2 sensor (LM-1) on loan from a friend this week and you owe me a ride in that bad boy... Mixture is controlled by the computer but if the sensors aren't working correctly the motor can run rich. Did Jerry wire up an OBD-II port on your motor? -Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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08-22-2006, 12:27 AM
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Location: Hickory NC USA
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If it is running rich, could also be a bad Fuel Injector. Once in the Bronco, a bad FPR was allowing fuel to go into the FPR's vacuum side and then into the intake.
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'75 914-6 3.2 (Track Car) '81 SC 3.6 (Beast) '993 Cab (Almost Done Restoring) |
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08-22-2006, 03:42 AM
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I'm assuming it is running rich because the exhaust pipe has a black soot covering the inside to the point where you can wipe it out with your fingers. Plus I've noticed it lately that the exhaust smell is quite strong.
Tom
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Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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08-22-2006, 05:44 AM
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Quote:
Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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08-22-2006, 06:08 AM
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1974 Porsche 911 Targa 3.6
The Blue Pheonix
