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Join Date: Aug 2005
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Unhappy Engine Quit

As I'm driving the engine just quit running as if someone unplugged it. It started again and then did the same thing a couple of days later.

It was running great.

Any Ideas.

Thanks

Old 08-25-2005, 04:40 PM
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Lightbulb Forgot it is a 1975 - 911

It is a 1975 911.
Old 08-25-2005, 04:42 PM
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Any other symptoms? When it happens, is the engine warm, cold? Does it stutter before dying? Does it happen while moving or when you've come to a stop?
Old 08-25-2005, 05:19 PM
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Exclamation

One time it died as I was slowing for a stop sign. The other time it was idling then stopped. Both times it was idling fine, no hesitation or rough idling, it just stopped.

Now it won't start

Thanks
Old 08-29-2005, 10:46 AM
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Check to see if the fuel is being delivered and the fuel pump is working (disconnect at the filter and have helper turn on ignition to run pump for 1 second. Have a glass jar or fuel container to catch fuel as it spurts out.) Probably time to replace filter anyway. Next if have fuel then check for spark. Your dwell might be off (need to replace points in distributor) or tune-up ignition system time?
Old 10-13-2005, 07:37 AM
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I would recommend changing the fuel accumulator at the same time as the filter. Just a cheap insurance policy, while your in there...
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Old 10-13-2005, 09:37 AM
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check your fuses
Mine died on the highway from a crusty and toasted fuse just the other day
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Old 10-13-2005, 09:49 AM
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I don't know those systems first hand, but don't the CDI (ignition module) fail regularly?
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Old 10-13-2005, 09:55 AM
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I had a similar problem ('81 911SC). For me, it wound up being a fuel mixture adjustment (was running too rich) and an air flow sensor plate adjustment (plate was too low).
Old 10-13-2005, 10:17 AM
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Check the fuel pump relay to make sure it is tight and the pins are making cood contact.
Old 10-13-2005, 10:27 AM
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You can take the plastic cap off the fuel pump relay, clean it up, put it back together and order a new one.
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Old 10-13-2005, 11:40 AM
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Aside from the above, check all electrical contacts and components, incl points, plugs, wires, distributor, connector in engine compartment, plugin connectors under dash, fuses and relays and their sockets.

The mixture setting is a good one to check as mentioned. Does your idle dip and then swing back up to normal when coming to a stop?

Another one to check is your ignition switch and related wiring.

The fuel pump is another possibility.

I like to check the easily replaceable/ accessible items first. Then move on if I don't find the solution.
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Last edited by Paulporsche; 10-13-2005 at 12:16 PM..
Old 10-13-2005, 12:13 PM
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I had a problem like that on my '78 Targa. It turned out to be the fuel pump.
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Old 10-13-2005, 12:54 PM
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If it were a fuse, I don't think it would have run again after the first failure. This happened to me when my Carrera fuel pump died on a country road in the middle of nowhere....on a very hot day....with no cell phone signal....and only 2 cigarettes left.
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Old 10-13-2005, 01:14 PM
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DW SD might be on the right track. I headed down the fuel route as well. When the Ignition Box goes bad, this can be the symptoms. It is a simple fix, easy to wrench, but not too cheap.

What kind of CD Box do you have? It will be located high on the driver's side wall of the engine compartment. If it is a PermaTune, do a search on this site. The silver ones are quite prone to expiring and they start it by giving random symptoms. Mine burned out the Bosch Blue Coil as well. The Blue ones are supposed to be very good.

A Bosch is usually considered your best one, but these can go bad as well. There is a very good explanation on this board on how to trouble shoot and possibly repair the Bosch, this will be a silver unit I believe). You could aslo have a MSD (red) or some other ignition system. Take a peak and post results. This might not be fuel related but spark related.

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Old 10-13-2005, 01:19 PM
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