Ignition coil

[jk911]

1975 911, 2.7 CIS .
Put in my reconditioned alternator yesterday.
I started the car and it ran fine. I realised I hooked up the ignition coil anit high so I couldn't close the boot lid. so I disconected it, lowere it and reconected it.

NOW the car won't start ????

It turns over, gives a spark but wont start.

I called road service who said the coil was a bit weak or maybe the ngine flooded ?
He pulled on the ignition leads and snapped a couple of them ie(disconected from plugs). Is this the casue ?

Just to clarify something:
When I purchsed the car ie (its current state), the previous owner disconected the CDI unit and replaced the coil with a Bosch GT40R. I know this is not normal but it was running o.k before today.

HELP PLEASE !

[davis911s]

So did the roadside guy get it started? If so that could be flooding. If not the wires could be hooked up wrong or you may not have reconnected the ground wire???

Did the car have any starting or restarting problems before?

Shawn

[jk911]

No the guy could not get it started.

I did have warm start problems before. but now it wont start cold or at all. the fuel was definately there yesterday, you could smell it.

I just purchased a new GT40R coils, sparke plugs and I ordered aftermarket ignition leads for tomorrow to see how it goes.

Original leads will cost me $600 and the original coil $400 plus I don't know if the CDI is O.K .

Do you know is The GT40R is o.k to use ?
May be the resistor is gone, it got very hot yesterday so i purchased a 1.6 ohm one today Is that suitable??

[davis911s]

I am curious to how the PO disconnected the CDI and never replaced it with ANYTHING??

Before you change anything double check the grounds and all the connections. If there is spark, is there spark at all cylinders?
And ensure that all the leads are tioght to the plugs otherwise it WILL NOT run.

Keep us updated

Shawn

[CamB]

My 69T ran terribly with points and a coil (and a worse-for-wear Marelli distributor). The plugs fouled pretty easily. I bought an MSD CDI unit - ran much better after that. It is carburetted which doesn't help.

How long had the car been running well before the replaced alternator? Did you generally drive around town or was it more open road type driving? There is a possibility the plugs have become fouled... although buying an MSD unit (and MSD coil) is not a cheap way to find out if this is the problem (although cheaper than OEM!). I do however figure that Porsche put a CDI box there for a reason.

I also replaced the ignition wires with Aussie made Top Gun spiral wound wires (they carry a set for early 911s). They were NZ$167, so less than A$150. MUUUCH cheaper than the OEM stuff.

[jk911]

Yes, the leads are the top gun ones ! Are they good !
I note that they fit all model 911's which concerns me.

Yes the car runs fine withouit the CDI unit. I spoke to Porsche about it when I bought the car and they told me not to worry about it its fine .

[davis911s]

The only thing I think is that if it ran before you moved the coil and all you did was move the coil. Nothing else, I would assume that there is a faulty connection somewhere.

Go back through the wiring and double check everything, it is possible that a part failed at the same time but that would be quite a coincedence

Shawn

[CamB]

The Top Gun wires look fine. I only used them for a few hundred kms, but they seem to be well made and fit (very) well.

Good luck finding the problem.

[jk911]

Why did you only use them for such a short period of time?

[CamB]

Because the car is in the process of "T motor out" and this is going in (it has a 964 twin-plug distributor and 964 leads):

http://forums.pelicanparts.com/uploads/3.0rs_on_stand1.jpg

Matt Smith is the new owner of the wires, he has to provide feedback from now on

However, rest assured if the 964 leads degrade over time, I will replace them with two sets of TopGun wires.

[pwd72s]

Well..Geeze Cam...whatever floats your boat! What can I say, other than, HOLY FOCK!

[Matt Smith]

Hopefully Paul, 'Fock' will be the mildest of expressions to leave Cam's mouth when he nails the re-engineered T in 1st gear. Shouldn't be long to wait now.

Actually, I already had a set of Top Gun leads, but they are stainless core, and it seems the spiral wound ones that Cam bought are better for the MSD set up we both have.

I think you need a decent CDI system in your car, whether it's the Bosch one or aftermarket (obviously MSD is my choice). It's a nice unit, but more to the point, any CDI will outperform a GT40 based system by about ten million to one. Chuck it out and do it properly! You will be able to get MSD in Aussie; probably cost AU $400 or so for a 6AL and $80 for the matching Blaster 3 coil. Ring some American type performance shops as they will stock the stuff. I imagine lots of units would have been shoe-horned into that abominable Mullet iron you guys call Aussie Muscle

Incidentally, Cam is gifting me his Top Gun leads in exchange for storing a BMW classic race car in my stables. Could this mean the man is having a midlife change of brand loyalties? I sense the Pelicans need to put the chap back in his place and give him a jolly good thrashing with the Porsche whip.

[CamB]

(running for cover) I don't mean any harm... its a 2002tii and the only way I could afford MFI

Oh alright, here it is - cheap, compared to trying to race a 911.

http://forums.pelicanparts.com/uploads/02tii-1_small.jpg

And Paul, rather like Kurt Starnes, I'm a bit worried about traction in the poor old 'T' (not as worried as him!)...

[Matt Smith]

Hmmm. I recognise that hedge.

[CamB]

See Matt - all that hard work in the garden paid off. The hedge makes a nice backdrop

[jk911]

O.K
So I have been busy.

I replaced the following:

Fuel filter;
fuel accumulator;
spark plugs;
ingition leads;
GT40R coil;
1.6ohm resistor;
injector seals (after cleaning the injectors);
reconditioned alternator;
blinker relay.

So now my car starts and runs but its still abit sick.
The alternator is still not charging properly.
The idle is irregular and fluctuates (particularly when changing gears in the sporto, it changes from 2500 to 800 at times (very annoying).
The light are dim and sometimes the headlight swith off by themselfs and the indicators light up (not flash).

Im lost and confused . Please help.

P.S when cleaning the injectors i notices two of them were covered in oil. also all the spark plugs where Black !!!