944JL

Hi all,

I have a couple of questions about an '86 944 that I've had for about 3 years.

1. It runs rich (fuel odor when the sunroof is up). The car has 107,000 miles, runs fine, idles fine, plugs burn clean. Any ideas of where to start looking? Would an O2 sensor cause this problem?

2. Maybe a related question, but this 944 has a MPG gauge on the speedometer. Most of the time it doesn't work, but ocassionally it does. I know the gauge is vacuum activated, but where? A vacuum leak would make it run rich? Is there a sensor somewhere?

any advice would be appreciated.

thanks......944JL

Ahmet

If the car runs fine, and the plugs are clean, then the smell is probably coming from under the hood (and the 'fresh air' blower is helping it get inside the car), then out the exaust pipe.

The mpg gauge should be in the tach, and not the speedo. It's electronically controlled. The DME calculates how much fuel you're using (by the injector cycle), and calculates your instant mpg using the input from the reading for the speedo. If it works only sometimes, chases are the tach is broken, you can get it rebuilt, or get another used one that works.
Hope this helps.
Ahmet

944JL

thanks Ahmet for the reply.

You're right the the MPG gauge is on the tach. Sorry, it was late the night I posted the note.

The interesting part is that the MPG gauge will work on a hot day, like today. The tach itself works fine. Knowing the signal comes from the DME helps, at least it's not a vacuum leak.

The fuel smell still has me puzzled, it's like a rich mixture, but I pulled all 4 plugs recently and they were perfect.

Maybe I'll just drive with the windows up and the sunroof down. I can't smell it then.

thanks again....944JL

Olli Snellman

Check out that your rear hatch closes as it should.If it's open even a little you get fumes and odor inside your car when driving roof or window open
Olli
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1988 951