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Join Date: Nov 2002
Location: mississippi
Posts: 179
running rich

I think my '86 N/A is running rich is there any fuel mix. adjustment I can tweek a little ? it may just be burning a little oil although it does'nt smoke.I changed the plugs and the were all a little wet and black (bosch platinum). Any help would be appreciated.
Thanks , cj44
Old 06-07-2004, 07:29 PM
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Most "adjustments" are pretty much set in stone. You replace sensors that are out of spec. Rotor and dist cap that are worn; plug wires that arc to the engine; vacuum lines and intake boots that are cracked and leaking; fuel pressure regulators that are out of adjustment.

You could mess with the spring tension in the air flow sensor. Tighter is less fuel. Take off the plastic cover and you will see a large plastic wheel with a spring detent. However this is NOT recommended.

Check out www.frwilk.com
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Last edited by SoCal Driver; 06-07-2004 at 07:35 PM..
Old 06-07-2004, 07:32 PM
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running rich

Thanks for the advice .I actually have changed all those parts recently plugs,wires,cap & rotor but not the sensors maybe that is where the prob. lies.
Thanks again , cj44
Old 06-07-2004, 08:51 PM
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I would look at your O2 sensor.
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1974 Vespa Rally 200, 1974 Vespa Primavera 125, 1963 Solex 2200, 1938 Buick Special, 2008 Mini Cooper S, 2010 Mazda CX-9, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar - in the stable
1989 Porsche 944, 1973 VW Beetle - gone but not forgotten
Old 06-08-2004, 04:47 AM
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Sensors critical to the fuel-air ratio are the enging temp, air temp, air flow sensor and speed reference sensor and as just mentioned the O2 sensor.

The fuel pressure regulator and dampener can cause a rich condition depending on the failure mode.

Injectors can leak past the pintal seal if these are really crudded up. In some cases the filter screen is missing in the injector inlet letting large particals pass.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 06-08-2004, 08:28 AM
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running rich

Thanks guys I will check those things. But on the o2 sensor I have a chip which I was told would require disconecting the o2 .
Old 06-08-2004, 06:21 PM
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There is your problem. Your computer CANNOT control air/fuel ratio without the O2 sensor. It monitors the amount of oxygen in the exhaust and turns it into a voltage reading that the computer measures and then adjusts injector pulse length and ignition timing accordingly.
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Old 06-08-2004, 07:24 PM
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Can't help you if you have "chip'd" your DME. Call the chip programmer and ask them.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 06-08-2004, 08:01 PM
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actually I bought it with the chip Supposedly in it I have never checked to see . But I have checked the o2 sensor and the wires are cut . A while back I posted a thread about the o2 sensor wires being cut and got a reply that some chips don't need the o2. There for I assumed that that was why my wires were cut.

Last edited by cj44; 06-09-2004 at 09:16 PM..
Old 06-09-2004, 09:12 PM
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