bryn_p

Hi all,

Yesterday I acquired a 1994 993 which started fine first turn of the key in the morning, but later on in the evening it refused to start.

I examined the plugs and disconnected the fuel supply line to the engine, and sure enough no fuel is coming through the filter.

I have changed the DME relay (the old DME works in my 964 anyway so it wasn't that) and checked the fuel pump fuse, what next?

Also on a different issue the oil dipstick is showing as full with a cold engine - roughly how much should I drain out to get it to the correct level? It has not been run for more than couple of minutes like this fortunately.

Many thanks in advance,
Bryn.

bryn_p

Just checked the fuel pump and there is no power to it.

Any ideas gratefully received!

Thanks,
Bryn.

Garth S

If you bridge #30 to both 87 & 87b in the 'DME' relay socket ( 3-way jumper), does the pump run? If so, and the DME relay works in your other car, then the trigger signal that closes the relay is likely the problem .... #86 to #85: that can be a poor ground, break in the wire, DME connector pin corrosion, etc.
If the pump does not run by doing the above, I'd e tempted to run a fused +12v directly to the pump after checking that it has a good ground.

allill

Does your car have an imobilizer?

bryn_p

Thanks for the advice guys.

I tried bridging the terminals but no luck although I was using a paper clip so might try something more substantial tomorrow.

No idea about the immobilizer, how can I tell?

Thanks again,
Bryn.

allill

Does your car have a remote?

rome

If your car has the "drive block" feature you have to lock and then unlock the doors or the engine won't start.

bryn_p

I only have the one key for the car, and no remote.

If I lock the car with the key in the door, the red lights on the door pins start flashing.

Does this indicate the immobiliser?

Many thanks,
Bryn.

David in LA

a 1994 993 is a euro-spec and is equivalent to a US-spec 1995 model. it has an alarm but no remote immobilizer.

bryn_p

Hi all,

I'm still trying to resolve this problem but no luck so far.

Got a new DME but nothing, so I tried connecting a 12v supply direct from the battery to the fuel pump.

I just want to check - on my car I have a brown wire and a black/green wire going to the fuel pump. I assume black/green is positive?
Sorry for the stupid question but I assume the fuel pump SHOULD be earthed and I just need to run the one wire for the +12v?

So I guess if with the +12v connected direct to the pump there is nothing then it is either the fuel pump or a bad earth? Where should I check for a bad earth?

Many thanks in advance for any help - its driving me nuts now

Cheers,
Bryn.

Garth S

Yes, I would also first check for a good earth/ground connection : that is a conductivity test ( looking for 0 ohms) from the brown wire at the pump to any bare chassis metal. Then take the fused +12v to the other connector, and the pump will do its best to run ...

bryn_p

Afternoon guys,

Just thought I'd let you know that I have now resolved this.

The solution was to clean the battery clamp terminals. Incredibly the car still turned over fine but it seems that the dirty clamps were not giving a good enough earth to run the fuel pump.

So I guess the moral is try the simple things first!

Thanks for all your help,
Bryn.