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Non starting 944
https://forums.tipec.net/viewtopic.php?f=25&t=24232		 Page 1 of 1
Author:  8828 [ Wed Nov 27, 2019 1:59 pm ]
Post subject:  Non starting 944
Hi
New to the forum
Bought a 1988 944S recently. In trying to change the leaking small hose from water pump to heater rail, I disturbed the 3 prong plug just behind the cam cover (right side) of engine.
The male prongs are numbered 1,2,3 but not the female plug.
I reconnected the plug (possibly the wrong way round) and started the engine.
Started first turn, ran for a couple of minutes then misfired and stopped.
Now will not fire. Tried reversing said plug to no avail.
Previously the car ran ok, albeit very rich.
What have I done.
Any advice gratefully received.
Thanks
PC
Author:  Cloud944 [ Sat Nov 30, 2019 6:32 pm ]
Post subject:  Re: Non starting 944
That'll be the plug for the cam position sensor. There are notches on the plugs you can use to check the orientation.

Assuming you haven't disturbed the sensor itself which is bolted on the back of the cam gear housing I can only imagine it might be a broken wire. If you have a multimeter you can check for continuity at the DME pins, if not check the pins haven't backed out of the plugs and see if moving the wires around a little helps.
Author:  Prophead [ Sat Nov 30, 2019 7:15 pm ]
Post subject:  Re: Non starting 944
You might have caused the DME relay to fail, or it just failed coincidentally. Worth swapping it out.

If it was running rich your Fuel pressure regulator might be knackered as well.
Author:  Waylander [ Sun Dec 01, 2019 1:43 am ]
Post subject:  Re: Non starting 944
Cam sensor won't stop it from running,

Just retards the ignition timing

It could be the plug for the crank pulse sensor, that would stop it running
Author:  8828 [ Sun Dec 01, 2019 1:45 pm ]
Post subject:  Re: Non starting 944
Thanks very much for your advice.
Currently out of country but will check out your suggestions on my return
Author:  8828 [ Wed Dec 18, 2019 4:28 pm ]
Post subject:  Re: Non starting 944
Thanks again for good advice
DME relay it was, started as soon as it was replaced.
Still not figured cam sensor plug connection but car seems to run fine with the plug disconnected and taped up out of the way?
In fact does not smell nearly as rich.
According to history a new fuel pressure regulator was fitted last year (& certainly looks shiny new)
Am I ok running with with the cam sensor disconnected as I think it blew the DME relay?
Peter
Author:  Waylander [ Wed Dec 18, 2019 6:15 pm ]
Post subject:  Re: Non starting 944
Cam sensor tells the ECU where the engine is in a four stroke 4 cylinder cycle

Without it connected the ignition timing is retarded and the injectors all fire at the same time instead of sequential

But it will not do any damage at all to the engine
Author:  8828 [ Wed Dec 18, 2019 9:30 pm ]
Post subject:  Re: Non starting 944
Thanks 4 that
I'll try & suss reconnecting it the right way round
Author:  Waylander [ Wed Dec 18, 2019 9:37 pm ]
Post subject:  Re: Non starting 944
Three wires
In out and shield
Author:  IanK [ Thu Dec 19, 2019 9:00 am ]
Post subject:  Re: Non starting 944
As Waylander has already said - it shouldnt stop it running.

The wiring for this sensor was fritzed on my S2 and it still ran.

When I fixed it the fuel consumption was miles better though!
Author:  Waylander [ Thu Dec 19, 2019 12:53 pm ]
Post subject:  Re: Non starting 944
you can buy new plugs and sockets from Brandshatch Performance

3 way Junior Timer plug
Author:  8828 [ Thu Dec 19, 2019 5:36 pm ]
Post subject:  Re: Non starting 944
Eureka
Found a wiring diagram last night
Connected today & car appears to be idling nicely, revs ok as well
So here hoping its solved
Once I get time I'll do a fuel pressure test regarding the rich running

Wife thinks I'm building her new kitchen :D

Thanks again for all the advice

Good Xmas & New Year to all
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