Author Topic: GTV6 Ignition module  (Read 608 times)

0 Members and 1 Guest are viewing this topic.

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
GTV6 Ignition module
« on: March 12, 2019, 07:50:59 PM »
The original ignition amplifier module on Australian delivered GTV6's is an alloy box. I replaced the alloy module with a smaller module from my written off Alfa75 many years ago. Anyone who has the original module might be able to help me. I drew myself a wiring diagram of the module swap and now years later I can't find the diagram. I need to know the colour of the wire's relevant to their position on the original alloy module. The alloy module terminals are numbered 16 15 31 31b 7 as seen in the photo. If someone has the time to pull back the rubber dust cover and record the position of the wire colours I would be very grateful.
« Last Edit: March 16, 2019, 08:55:34 AM by sportiva »
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

Rising Sun

  • Newbie
  • *
  • Posts: 23
Re: GTV6 Ignition module
« Reply #1 on: March 13, 2019, 07:57:56 AM »
Happy to have a look tonight after work. Stay tuned...

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
Re: GTV6 Ignition module
« Reply #2 on: March 13, 2019, 10:29:46 AM »
Thanks
I am chasing an upper rev ignition breakdown so i am returning the ignition to the originl parts.
And work from there to fix it
Thanks again
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

Rising Sun

  • Newbie
  • *
  • Posts: 23
Re: GTV6 Ignition module
« Reply #3 on: March 13, 2019, 06:10:02 PM »
Ok, Iíve put a little diagram together for you. Note that the wire colours are when looking at the back of the plug (the wire side, not the terminal side). I hope this helps

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
Re: GTV6 Ignition module
« Reply #4 on: March 14, 2019, 03:46:51 AM »
Thank you rising sun
I do appreciate your time and effort.
Cheers Sportiva
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

Rising Sun

  • Newbie
  • *
  • Posts: 23
Re: GTV6 Ignition module
« Reply #5 on: March 15, 2019, 10:25:46 AM »
No stress at all. Happy to help!

carlo rossi

  • Hero Member
  • *****
  • Posts: 611
  • AROCA Member #: 8733
Re: GTV6 Ignition module
« Reply #6 on: March 18, 2019, 06:45:39 AM »
not sure if its relevant but if you have a 75 module from a 4 cyl it will count 6 sparks per rev as opposed to 4
so you end up with a limiter at around 4200rpm
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
Re: GTV6 Ignition module
« Reply #7 on: March 30, 2019, 08:48:29 AM »
Hi Carlo
When I spoke to you the other day about ignition modules I didn't explain the type of misfire my car has.
My car has strange symptoms it only misfires occasionally and only when the AC compressor is on I'm thinking it is some kind of excess voltage draw affecting the ECU ?. The AC pulls almost 1.5volts when I switch the AC on my amp gauge voltage drops from 13.6 volts to 12.2. the ECU needs 10 volts to operate so, in theory, I still have 2.2 volts spare. The misfire is like a rev limiter as in the other car white we spoke of at about 5000rpm.
I am now researching your 4 v's 6 ignition module theory and so far can't find any specific differences a lot of suppliers have the same reference numbers for 80's 4 cyl Alfettas to 90's v6 75's.
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
Re: GTV6 Ignition module
« Reply #8 on: March 30, 2019, 09:20:22 AM »
https://www.ebay.com.au/itm/163351190744
I have purchased this 3.0 specific module will let you know how I get on. Will also, see if it fixes the white car
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

Colin Edwards

  • Sr. Member
  • ****
  • Posts: 442
  • AROCA Member #: 5065
Re: GTV6 Ignition module
« Reply #9 on: April 01, 2019, 09:25:49 AM »
I had a med < hi rpm miss on my 75 3.0.  Replaced plugs, leads, distributor cap, rotor button and ignition module as well as cleaning up all the grounds and +12V supplies.  Need to be careful with the ignition module as the number of pins is critical.  Must be a like for like replacement.

None of the above really cured the misfire, however replacing the rotor button probably had the greatest impact.  All these needed doing anyway so no harm.

The coil however was non-genuine.  PO had fitted a Bosch GT40 for reasons unknown. The primary resistance of this coil was designed for systems with breakers / points.  After a bit of research managed to locate a Bosch coil with the lower primary resistance suited to electronic ignition.  Mis-fire eliminated!

Coils for breaker-equipped ignitions "usually" feature higher resistance primary coils so as to keep the current lower and prevent point pitting, metal transfer and welding etc.  Coils for electronic ignitions "usually" feature lower resistance.  The ignition module "usually" features on-board current limiting.  If the resultant spark is voltage supply sensitive, maybe the coil primary resistance is a tad high?
 
« Last Edit: April 01, 2019, 09:58:54 AM by Colin Edwards »
Present
2018 Abarth 124 Spider
2015 Giulietta QV
1987 75 3.0

Past
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5

sportiva

  • Sr. Member
  • ****
  • Posts: 489
  • ooVoo
Re: GTV6 Ignition module
« Reply #10 on: April 01, 2019, 03:00:59 PM »
Thanks, Col

The coil on my car is the same as when I purchased the car over twenty years ago I will research a replacement coil and go from there thanks.

Cheers Glen
3.0 GTV6 156JTS X2

75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted

Car forums usually have more philosophers than practitioners

Colin Edwards

  • Sr. Member
  • ****
  • Posts: 442
  • AROCA Member #: 5065
Re: GTV6 Ignition module
« Reply #11 on: April 04, 2019, 01:06:41 PM »
Hi Sportiva,

Given how hostile an environment the engine bay is to anything electrical or made from rubber or plastic, fair chance the coil has seen better days. 
The coil may have shorted primary and / or secondary coil windings.  Either one will significantly reduce the spark power.

I sourced a new coil from one of the club sponsors here in Melbourne.

When parking the 75 in the garage after taking it for a punt, I have a habit of fully lifting the hood.  Prevents the heat soak from cooking delicate, expensive and difficult to replace gear critical to performance and reliability.  Might help.........cant hurt!

Colin.
Present
2018 Abarth 124 Spider
2015 Giulietta QV
1987 75 3.0

Past
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5