1996 RS2 No spark

[bazgreener]

Are you sure the coil pack modification is wired correctly and working or could that be the source of your no spark?



Yes, it toggles the K line.

The immobiliser circuit is in an off-white plastic housing adjacent to the steering column.

The immobiliser won't prevent the engine from starting but it will prevent the engine from running.

These cars are too early to have a comfort module.

Thanks for the info Johne,
Is the immo like the newer stuff where it'll allow it to start for a second then die?
I have had an oscilloscope on the coil outputs while cranking but am seeing nothing so assumed the ecu at fault. From a wiring diagram i found online the coil upgrade looks to be wired correctly.
I have seen the white box above the ignition barrel.
With vcds at the diag plug in the fusebox i can talk to the immo, abs, airbags etc but not the ECM. Working on the pinout info from this site i was hoping i could communicate on the bench but i get nothing on the kline.
I just need to prove that the engine is able to run and sounds ok then the car will be stripped for restoration.

[bazgreener]

Todays update......
Found some immo info yesterday and if correct i have disabled the immobiliser by joining some wires at the immo box, sadly i'm still in the same position with no spark! I still have comms via vcds with some modules but still nothing from the ECM.
I think although i had immo faults stored previously that the immo wasn't the issue as i was seeing kline messages at the ECM pin55 which i believe i wouldn't have seen if the immo was active?
I was reading this post- https://forums.quattroworld.com/s4s6/msgs/15284.phtml by UrS4boy which explains how theignition system functions so going to work through this and hopefully find something amiss.

[johne]

PM sent

[bazgreener]

Just a quick message to say that i begrudgingly sent the ecm away for testing and they've confirmed that it is faulty and not switching the coils/injectors.
They say they can repair it so i'll update here when i get it back.

[sal_s2]

Any working non immo aby or adu should start the car if you just want to make sure whether its the ecu or not

Also an aby ecu can be modded to rs2 spec

[bazgreener]

Any working non immo aby or adu should start the car if you just want to make sure whether its the ecu or not

Also an aby ecu can be modded to rs2 spec

Hi, yes i was aware of this but finding an immo off ecu wqas proving difficult and after testing i was 90% sure it must be the ecu causing the problem.

[bazgreener]

So the ECU repair guys say they can't repair the ECU so now i need to find either a used ECU that i can use or buy a MaxxEcu with their adaptor harness. What are my chances of finding used?

[Tractor Dave]

Sal here is breaking an S2. I suggest you ask if the ecu is available. It can be modified to Rs2 spec.

[bazgreener]

Sal here is breaking an S2. I suggest you ask if the ecu is available. It can be modified to Rs2 spec.

Thanks for the heads up :-) Is this Sal16?

[Tractor Dave]

No

https://www.s2forum.com/member/29-sal_s2

[bazgreener]

No
https://www.s2forum.com/member/29-sal_s2

Perfect thanks.

[bazgreener]

I never got a rerply from sal_s2 about the ecu he was selling so i've decided to go with a MaxxECU standalone. The only thing i need to know is what injector size is used in the RS2 compared to the S2 as i believe it's larger?
20250304_103729.jpg
The only info i found online confirmed this is the standard RS2 injector but if the S2 uses a smaller injector i am going to need to adjust the MaxxEcu basefile as it is sold only for the S2 not RS2, although MaxxEcu have confirmed it should work with the RS2 motor.

thanks

[Tractor Dave]

Paul posted this a few years back

https://www.s2forum.com/forum/general/open-topic-new/40291-s2-injector-flow

[K Simmonds]

It also worth noting that the RS2 uses a 3.8 bar FPR as opposed to an ABY 4 bar one if your're going to ask Maxxecu for a base map.

[bazgreener]

It also worth noting that the RS2 uses a 3.8 bar FPR as opposed to an ABY 4 bar one if your're going to ask Maxxecu for a base map.

Good info, thanks :-)