Quick one on Marelli Cossie ignition
#1
PassionFord Post Whore!!
![](https://passionford.com/forum/images/pf_gold_member.png)
Thread Starter
Join Date: Apr 2004
Location: Warsaw, Poland
Posts: 5,343
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
I have a quick question from guys over here trying to convert big turbo Escos to AEM managment. What second cable going to ignition amplifer does?
There are two going to marelli ECU from igniotion amplifier, but AEM will only accept one. What does the other one? The car will run with one of them diconnected but missfires over 5k rpm.
There are two going to marelli ECU from igniotion amplifier, but AEM will only accept one. What does the other one? The car will run with one of them diconnected but missfires over 5k rpm.
#3
PassionFord Post Whore!!
Join Date: Sep 2003
Location: Macclesfield - you'll never leave....!
Posts: 4,519
Likes: 0
Received 1 Like
on
1 Post
![Default](https://passionford.com/forum/images/icons/icon1.gif)
std big turbo ignition amp wiring pin out is as follows....
1 output to coil
2 gnd (0v)
3 trigger gnd from ecu
4 pos (12v)
5 not connected
6 trigger pos from ecu
7 not connected
1 output to coil
2 gnd (0v)
3 trigger gnd from ecu
4 pos (12v)
5 not connected
6 trigger pos from ecu
7 not connected
#5
PassionFord Post Whore!!
Join Date: May 2003
Location: Wiltshire UK
Posts: 3,795
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
The cossie ignition system is very sensitive to noise on the ignition trigger lines, mainly attributable to less than perfect earthing arrangements, which gets aggravated with age. The second connection to pin3 is essentially a ground reference for the trigger circuit running directly from the ECU. In theory (from memory) I believe it may well run without that connection, but I'm not surprised you get misfire problems as a result, noise on pin3 produces this problem.
You can connect pin3 of the amplifier to ground directly, while you are at it make pin2 as good a ground as you can make it too, this as standard goes back through the loom to connect to ground remotely which is less than ideal.
You can connect pin3 of the amplifier to ground directly, while you are at it make pin2 as good a ground as you can make it too, this as standard goes back through the loom to connect to ground remotely which is less than ideal.
#7
PassionFord Post Whore!!
Join Date: May 2003
Location: Wiltshire UK
Posts: 3,795
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
no probs - let us know if it works OK!
I did a lot of investigation in this area and learn't loads about how it works (and indeed how it DOESN'T!!) when we did the zetec turbo project using Marelli management
I did a lot of investigation in this area and learn't loads about how it works (and indeed how it DOESN'T!!) when we did the zetec turbo project using Marelli management
![Grin](https://passionford.com/forum/images/smilies/icon_smile.gif)
Trending Topics
#8
PassionFord Post Whore!!
![](https://passionford.com/forum/images/pf_gold_member.png)
Thread Starter
Join Date: Apr 2004
Location: Warsaw, Poland
Posts: 5,343
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
I thinnk it will endup with Subaru ignition anyways, but they are trying to make it run with diostribiutor and all for now. Will let you know when I get the answer from the guys who do it.
Thread
Thread Starter
Forum
Replies
Last Post