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Electronic Ignition on polos without it. FAQ.


Gaz

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Finally I have electronic ignition on the derby! 8) If anyone else wants to do it on a polo 75-85 then heres what you need:

-Ignition coil from a late mk2 polo or mk2 golf Golf together with the ignition amp and ignition amp loom. I found the golf loom more useful as it was much longer. This meant I didnt have to drill a hole in the bulkhead which is there on later models but doesnt exist on early models. Instead the wiring could go up past the wash bottle through the gap at the end of the slam panel.

-Saab Distributor with hall sender, fitted to 900s and probably 9000s in the late 80s and early 90s If you find the right distributor it has the same plug as the polo/golf loom. The bosch number for the dizzy I've got is 0237 021 050. This dizzy is compatible with late mk2 polo HT leads and dizzy cap and rotor arm so you may need to buy those too.

The wiring is very simple, theres 6 wires on the ignition amp loom of which three go to the hall sender. of the other three the green wire goes to terminal 1 of the coil, the thin black wire goes to terminal 15 and the thick black wire goes to the -ve terminal on the battery.

From the original points ignition loom you may find that the green wire went to a white "two pin plug" on the coil. The red wire which is the other pin on this plug is for the rev counter and oil pressure circuit and this wire can be removed from this plug and plugged into the new coil in the same place.

There will have also probably been a black wire on the same loom as the red wire plugging to terminal 1 of the coil Plug this into the new coil too.

And thats it apart from figuring out firing order. When I go out to my car again later I will make a note of locations.

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  • Gaz

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Just taken the car out for a drive and I cant believe the difference it's made. Its actually driveable now. Idle was really hight after fitting (2000ish rpm) which goes to show how badly it was running before (with no change in mixture or idle settings between dizzys). I just need to set up the mixture and idle properly now and then I'll be happy. The firing order by the way is:

Rear 1

Top 3

front 4

bottom 2

as viewed from the front of the car and no1 being the cylinder at the timing belt end.

I cant recommend this conversion enough. One less thing that has to be serviced too. 8)

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  • 2 months later...

Sorry yeah I've kept meaning to do this. I will take some in the summer when you need them ;) But seriously I will do it the next time I need to go under the bonnet in the derb.

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  • 3 months later...
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  • 11 months later...
joeovls28

how do you know if your car has electronic ignition? I've just converted to a GT engine and I'm not getting a spark, do i need electronic ignition? thanks

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GT has the ignition built into the ECU. As long as you have the right dizzy etc it should work. I suspect you may have the two plugs near the coil the wrong way around.

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  • 3 years later...

I just thought I'd bump this with some extra info. I'd been searching for ways to convert my early engine to electronic ignition and heard about the mk2 Golf 16v ECU setup being used as an alternative to the Saab 900 distributor. I found some of the KR stuff cheap so I bought it, but there are a fair few more wires than there is with a Saab dizzy and I wasn't sure what all of them were for or whether they were needed at all.

Luckily a lad by the name of Rubjonny over on the Mk1 Golf forum has detailed the wiring for this setup, so I've copied his info over onto here to try and help those who might still be wishing to convert their points engine using this method.

So as well as the KR dizzy, you'll need;

KR ECU

[1](85).JPG

Ignition amp/TCI module (same as late polo mk2/Golf mk2 small block)

img11851.jpg

And the KR ECU loom with wiring numbered as follows

g2krignloom.jpg

1 - Earth to battery -ve

2 - KR ign controller plug

3 - TCI-H plug

4 - Black - KR ign controller & TCI-H ign live - terminal 15 side of coil

5 - Green - Coil trigger - terminal 1 side of coil

\- red/black - spade is for the isv control unit, the main wire is the rev counter feed

6 - Brown - Earth to cylinder head

7 - Blue/white - Temp sensor feed (use one of the 3 on the side of the head)

8 - Dizzy plug

9 - red/yellow - Fuel pump relay earth trigger

\- black/yellow - idle switch feed (12v feed with throttle shut)

Its all plug and play! :-D

Edited by Phataz1
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Seems complicated vs using late mk2 parts.

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Seems complicated vs using late mk2 parts.

Using late mk2 parts with what dizzy? ;) The right saab dizzys aren't easy to come by!

Edited by Phataz1
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Nah, just a late mk2 disi.

Fair play for finding a way with the KR bits though.

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Nah, just a late mk2 disi.

Fair play for finding a way with the KR bits though.

Can you convert late mk2 dizzys to fit the solid lifter engines then? Cymro said something about it but I didn't think it was possible?! :oops:

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grungeisdead

You can change the cam drive, or it at least looks possible, it looks there is a metal rolled dowel that you can tap out. I couldnt get it to budge inn my experimentation

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You can change the cam drive, or it at least looks possible, it looks there is a metal rolled dowel that you can tap out. I couldnt get it to budge inn my experimentation

Yeah you can get them out but there very stiff and the plastic is brittle so when you remove the pin from the cam drive it will usually break.

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You can change the cam drive, or it at least looks possible, it looks there is a metal rolled dowel that you can tap out. I couldnt get it to budge inn my experimentation

Yeah you can get them out but there very stiff and the plastic is brittle so when you remove the pin from the cam drive it will usually break.

Yeah this is the problem I had when I tried stripping a spare dizzy I had.

Anyway, I've just looked at a late mk2 dizzy and its got a completely different housing and the part that the seal sits on is much bigger than the solid lifter one, so it wouldn't fit into the head even if you did manage to change the cam drive.

Unless there is a way of putting the internals of a late mk2 dizzy into the early dizzy the only options are the saab dizzy or the KR setup I mentioned above.

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  • 2 months later...
vee-dub90
You can change the cam drive, or it at least looks possible, it looks there is a metal rolled dowel that you can tap out. I couldnt get it to budge inn my experimentation

Yeah you can get them out but there very stiff and the plastic is brittle so when you remove the pin from the cam drive it will usually break.

Yeah this is the problem I had when I tried stripping a spare dizzy I had.

Anyway, I've just looked at a late mk2 dizzy and its got a completely different housing and the part that the seal sits on is much bigger than the solid lifter one, so it wouldn't fit into the head even if you did manage to change the cam drive.

Unless there is a way of putting the internals of a late mk2 dizzy into the early dizzy the only options are the saab dizzy or the KR setup I mentioned above.

what dizzy can i use for a solid lifter head then?

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You can change the cam drive, or it at least looks possible, it looks there is a metal rolled dowel that you can tap out. I couldnt get it to budge inn my experimentation

Yeah you can get them out but there very stiff and the plastic is brittle so when you remove the pin from the cam drive it will usually break.

Yeah this is the problem I had when I tried stripping a spare dizzy I had.

Anyway, I've just looked at a late mk2 dizzy and its got a completely different housing and the part that the seal sits on is much bigger than the solid lifter one, so it wouldn't fit into the head even if you did manage to change the cam drive.

Unless there is a way of putting the internals of a late mk2 dizzy into the early dizzy the only options are the saab dizzy or the KR setup I mentioned above.

what dizzy can i use for a solid lifter head then?

You can use the dizzy from a KR 16v engine from a mk2 golf, along with the mk2 polo ignition amp and loom for non advanced ignition. Or the KR dizzy with the KR ECU and loom to retain the advance.

Or, you can use the Saab 900 dizzy along with the mk2 polo ignition amp and loom for vacuum advance ignition :-)

The dizzy from a hydraulic head mk2 polo won't fit into the solid lifter head.

Apparantly a peugeot 205 1.9 GTI distributor will also fit into the solid lifter heads but I can't confirm this. They look the same but you never know until you try em lol.

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mk1 ibiza 1.2 and 1.5 dizzys fit as well, but are a bit thin on the ground these days (no moreso than saab ones though!)

It looks to me like the KR one is the best bet as it does the lot, it is similar to how the GK management operates but the GK setup is all containd in the ECU (no separate amp)

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-Saab Distributor with hall sender, fitted to 900s and probably 9000s in the late 80s and early 90s If you find the right distributor it has the same plug as the polo/golf loom.

I have a dizzy that fits my head, but the black hall sender plug is rounded. Do you reckon I could fit a new hall sender kit with the square plug to match the Polo loom?

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Scrub that last question.......

Just looked up a new hall sender kit for my Saab dizzy and it throws up the same sender as fitted to the MK3 Polo range.

Makes things nice and simple. HTH.

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  • 3 weeks later...
-Saab Distributor with hall sender, fitted to 900s and probably 9000s in the late 80s and early 90s If you find the right distributor it has the same plug as the polo/golf loom.

I have a dizzy that fits my head, but the black hall sender plug is rounded. Do you reckon I could fit a new hall sender kit with the square plug to match the Polo loom?

I actually had this problem but I cut the end of the loom from the saab i took the hall sender off so I could re-wire the polo loom. Dizzy was faulty though. :(

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