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sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

Ok its almost ready to give its first shot at running.. just a few hours away

I spent the morning making the pipe which goes from the Top of the CIS head to the WUR and connecting other bits and pieces.. Its just a matter of tidying up a few bits here and there, running fuel through the pipes and watching it hopefully start up.. (I have my doubts though.. nothing ever goes that smoothly

)

Well my problem is I an anally retarded when it comes to reading the wiring diagrams on the haynes manual..

The wires that I would like to know/make sure they go in the right place are:

The black wire that comes off the distributor

A wire that comes out of the CSV (there is the normal connector +1 wire in that loom)

A Black/Blue wire that is alone in the middle of the loom

A Green/Yellow wire that is alone in the middle of the loom

I know some fit onto the relay in the engine bay, but which and in what position I am not sure..

Also the earth connector that on one side is bolted to were the coil is, where is the correct place for the other end?

Also the PO cut alot of the wires at the front of the car and the radiator fan no longer has the original plug but had been cut with 2 spade connectors on it. Can someone help me identify which ones would be the right ones for the rad fan?

Thanks again for all your help guys! Its almost there, and once the engine is running, ill start on the front lights and can finally put the front clip back on

Cheers,
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

leadfoot · Posted: Mon Dec 24, 2007 10:01 pm Post subject:

hmmm....
earth strap should go to the number four bolt on the intake manifold

black wire from distributor should go back to the ignition box mounted on the wheel well,

radiator fan wiring,

from the earth point near the headlight (opposite side to where the headlight motor is) trace this back to the thermo switch mounted in the radiator, the other connector should go to the radiator fan, then the other connector on the fan should go back to the relay in the fusebox via the big resistor mounted behind the glovebox (may be removed though) this is used to keep the fan idling at slower speeds once the engine is shut off and stop major battery drain... but you can bypass it easily enough
Leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

Thanks leadfoot.. I will get the earth strap cleaned up and put it in the right place next time I get a chance to touch to car

Btw, good luck with the auction of your beast.. I hope it fetches the $ you want.. A small tip, I sell quite a few things on ebay, and right now ebay is dead.. it might be an idea to list it at a time when ebay is busier and people have more cash in hand..

Thanks for the tip on the rad fan wiring.. I will have a close look at this too

Strangly I have never seen the ignition box mounted on the wheel well.. it is probably because I have never looked for it though.. I know the engine wiring has been messed with by the PO but I will sort this all out properly..

Next time I take anything apart which will be apart for a while, I will make sure to take a ton of photos for reference..

Another question to add, apart from all the others is probably very stupid..

I know the firing order is: 1-3-4-2 and I think I have asked this question in the past.. but where would each plug wire connect to on the dizzy cap?

Its the Euro 125 bhp engine. And from what I have read the correct timing would be 10 Degrees BTDC at 950 RPM which the vacuum hoses disconnected. I am presuming this would mean just to unplug the one which comes off the Distributor and goes to the intake manifold right?

I just want to be really sure on all these things.. Im hoping for new life to spring into the car when I finally turn the key

Cheers again,
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

Rich H · Posted: Tue Dec 25, 2007 3:07 am Post subject:

Timing is meant to be 10 deg BTDC, but it will sound a bit rubbish. A little bit more makes it sound much better!
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Ozzie · Posted: Tue Dec 25, 2007 9:01 am Post subject:

Put the car at TDC and check the position of the rotor button.
It will be pointing to no 1.
CW from there is 1342.
When you remove the vacuum line from the dist, plug it with a golf tee or similar, then check the timing.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

Hey guys,

Thanks for the help so far..

So Rich, basically somewhere around 15 deg BTDC should sound and run ace?

Ozzie, thanks for the advice

Its a big help.. I will do that

One of the mystery wires in the engine bay went to the oil pressure switch mounted at the rear of the block.. Would this be the Black/Blue wire?

Cheers,
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Agree with Rich on the timing. The book says 10° but will run better at 15° initial as long as you use good fuel.

Having just rewired my engine and gauges know that the black/blue wire is indeed the oil LIGHT. Goes to the WK terminal on the sender.

Come on Sparky get that car running!

Roger

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

well its almost 1am over here and im dont have to be up early tomorrow so im off to connect a few little bits and tidy up the engine bay a little bit

Cheers for the help guys.. hopefully this week ill get it running

As long as one of the shops which I need a little pipe from is open it should all be set.. half the island is on a week shutdown though..

Ill keep you updated when I get back

Cheers,
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

Hey guys.. Just came back up and attached a few more bits.. all that is left is the following: Rad wires and Rad fan wires.

Get one hose from a shop when its open

And wire up the following which are all in the pics:

There is no ignition box on the car anywhere.. im presuming the PO made without it somehow or the car used this relay instead??

Here is the relay in the engine bay to which most of the mystery wires were connected: (it also shows the wire which came out of the CSV loom)

Here is another shot of the wire that comes out of the CSV loom:

Now this went onto the relay, the connector in the center of the pic went to the relay, but im not sure where the other connectors went to..

Here is the pic of the black wire that comes off the distributor.. (also long enough to connect to the relay)

And the last pic is of the other mystery wire that is in the engine bay.. this one is not long enough to connect to the relay..

Any help on any of these would be HUGELY appreciated! Once they find their homes the car is just about ready to start!!!!

Many many thanks again guys!
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

Ozzie · Posted: Wed Dec 26, 2007 12:09 pm Post subject:

I am unfamiliar with your ign system but:
If you have contact points in the dist. this usually connects to the coil -ve.
+12v from the ign switch usually goes to the +ve on the coil via resistors.
another wire from the starter usually goes to the resistors also.
however the PO may have wired in a relay so coil current doesnt go through the ign switch.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

I am hoping someone may have seen this done before or understand how the PO could have wired it up.. it is a BOSCH relay.. is it possible the very first model came from the factory with this kind of wiring?

Cheers..
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

Ozzie · Posted: Thu Dec 27, 2007 9:08 am Post subject:

looks like a standard relay.
85 and 86 would be + and - for the coil in the relay controlled by ign?

30 would be +
87 would be to resistors

dist would connect to coil -

thats assuming you have contacts in your dist - yes?
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Ozzie · Posted: Thu Dec 27, 2007 9:24 am Post subject:

This is similar to what standard wiring with contacts in the dist should look like.
Why not go back to standard?

_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

sparky · Joined: 27 Nov 2002 Posts: 772 Location: Malta

Hey Ozzie..

Looks like your top dog when it comes to electrics

I will have to check that I have contacts in my dist.

I am totally clueless when it comes to electrics.. but am not ashamed to admit it..

So somehow I still dont understand.. sorry about this..

So basically:
The black wire off the dist would goto the negative on the coil.
The 85 terminal on the relay should conenct to the positive on the coil
and the 86 terminal on the relay to the negative on the coil?

Damn I need to take an electronic coarse to understand this area of the car better..

Where would the Green/Yellow wire which is alone connect up to?

Also I pulled back the insulation tubing on the CSV loom and the red wire that comes out of there is bridged off one of the CSV wires.. which as far as I remember also hooked upto that relay.. does this make any sense?

Cheers,
SparkY
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945)

- Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

Ozzie · Posted: Thu Dec 27, 2007 9:48 am Post subject:

85 and 86 activate the relay and will do nothing for the coil.
85 is likely red. and 86 is black.
this activates the relay.

Could be that the PO had a hot start problem? or the TTS is stuffed.

does the red have power when cranking? even if briefly 10 secs?
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance