Hi all!

I'm new in this forum.
4 motnhs ago I purchased my dream car, a 1980 Porche 928 S.
I bought half rebuild, engine block was rebuild but the res of the parts (engine harness...etc) were dissamble in boxes.
I don't have experience in this car and since I didn't dissamble it I'm finding difculties in putting everything together. I was tempted to seek for assistance in this forum before but searching through the diferent posts I was able to find the answeres I needed and to progress until now.

I have put together most of the parts and the car cranks (has fuel and spark) but does not start.
Thing that I did:
- New ignition coil
- New fuel pump and filter
- Replace all the belts
- Timing belt done and aligned
- Shft gear coupler replace (shifter was with a lot of play)
- New oil, water hoses...etc.
- New green wire

As I said the car cranks and the fuel pumnp is working as well as spark.

But there are some wires and sensors that I can not identify where they go (see pictures attached)
I also notice from the fuse box that the XVI relay is missing. I believe the is the fuel injectors relay and the car won't start without i I guess. Is there any way to jump this relay?
Does anyone can help me so I can finalize the assembly and finally start the car?
Many thanks in advance,

Juan

 

Hi again,

I managed to jump the injectors relay but the car still does not start..
After 5 seconds or so when cranking a big backfire occurs at the air mixture control unit with a lot of smoke. That's it.
I have also tried to put starter fluid but still the engine does not start.

Any suggestions/guidance would be much appreciated.
Thank!

J

 

Are you sure the distributor is timed correctly to the cams and not 180 degrees out?

What fueling system is in an 80? Is it straight mechanical K-Jet or are the injectors electronic with plugs on them?

 

Hi Petza914,

I have doble checked the alignments of the Cams and the distributor and everything seems to be properly aligned.
Indeed this is a mechanical K-Jet,

 

Does it start on starting fluid where maybe the cold start injector isn't firing? That's controlled by a temp sensor down underneath it near the water bridge. When it's cold that sensor grounds and completes the electronic circuit to the cold.start injector so it fires when the engine is cranking.

The Auxiliary Air Valve also comes into play for cold start as does the WUR

 

No, it does not start with starter fluid.
It does the same, after a few seconds the air mixture control unit backfires and that's it..

 

In the last inspection I just made, I found that there is fuel in the exhaust. So I'm guessing fuel is going though the system but cylinders are not firing or burning the fuel.
I checked again and there is good spark in echa of the spark plugs.

 

that ground lug might be one of the fuel injector grounds it should be anchored to the top side of the right cam tower.
The other 2 electrical connections one is a temp sensor that works on the fuel system,
the other is for a fuel cutoff,
if you can find another owner that will take a picture of what they have,
yes you need a same year euro. a picture could be worth a thousand words.

 

Mrmerlin,

Many thanks for your reply.
Indeed, I put the ground lug in the right side of the CAM tower.
I herewith send the remainig wires from the front harness that I don't know where to connect. And the sensors that are pending to wire.
If any one has a 1980 Euro model, please tell me where to hook up these wires,
THANKS

 

Are the two unconnected wires in photo 1 with the female spade connectors in close proximity to the unconnected temp sensor in photo 2 that has the two male spade ends?

 

The two unconnected (female connectors) have a wire long enough to reach the sensor shown in photo 2 or even the other sensor (photo 3)

 

Juan,
Can you send an up close picture of your installed harmonic balancer. If it was inadvertently installed backwards (easy to do), you can have fuel, spark, and compression, but it won't be at the correct time. It will be 180 degrees out. If it is on backwards, just remove the balancer, turn it around and reinstall.

Good luck!

 

Hi Soontobered84,

I belive it is correctly mounted. See enclosed the picture.
Thank you all for you patience.

 

Wait a minute Soontobered84, is the harmonic balancer backwards?
It may be.
Can anyone confirm??

 

It is hard to tell from the picture, but that looks backwards. The numbers should read correct-side-up when standing in front of the engine.
That would explain not starting with starter-fluid, but the electrical connections may still be important for the K-Jet.
Do you have the workshop manual or the engine wiring diagram for the '80 Euro?