NO SPARK

[HB3]

I am not getting a spark on the vertical cylinder of my S4R (996). The bike died and then was jumped with a pair of jumper cables that were wired in reverse. At first the engine would not turn over but it would fire up on one cylinder by using the key code provided with the bike. Once the ignition is activated the left blinker starts blinking and when the ignition is turned off the right blinker will blink even without the key in the ignition. Below are what I have done and the result of that action.

Checked all fuses and connections……………No Change

Replaced immobilizer antenna………………...No Change

Replaced voltage regulator…………………….No Change

Replaced ECU with re-flashed ECU
from S4RS (999) {immobilizer disabled}….Bike will start but runs on 1 cylinder only

Reversed coils and spark plugs………………  No Change

Replaced dash from S4RS (999)……Appears to resolve blinker issue

Relays are good

Wire from spark plug to relay is good. Any help on other wires to test and where they are located will knock my socks off. Please Help!!!!

[He Man]

if you reversed the cables the fuse should of blown.

assuming you checked the main fuse as well, are you able to get a known working ECU?

[Howie]

Do check all fuses again, not just visually, but with a meter or test light.  This includes the main (40 amp) fuse by the battery tray.  There is a possibility you damaged the computer.  Unfortunately there are only two ways to diagnose the computer.  Either eliminate all other causes or replace with a known good computer.

How did you check the relays?  Spark?

[HB3]

I have visually checked the fuses, they all look good even the 40 amp fuse. I have replaced the ECU with a re-flasehed one off a S4RS. The reflash did elimate the immobilizer so now the bike will start without using the key code as on the stock ECU. The sad thing is that the bike runs the same on both ECU's. The jumper cables we used wre made up from battery tender leads and it did have a fuse that blew every time a jump was attempted. That being said damage could have happened in the split second before the fuse blew. I tested the relays as described in the service manual, I also switched the relays and there was not a change in how the bike ran, I will test the fuses and see what happens. I think I am looking for 2 different issues. The first one caused the bike to stop running in the first place and the second a result of the bad jump.

[Howie]

The good news is you do not need a computer.  Are you getting voltage to the coil?  If so, have you tried switching coils?  Answered   Are you sure the problem is park, not a fuel injector?

[HB3]

Did a visual test for spark and no spark. I tested the wire from the vertical coil to the ECU and it appears that there is a break somewhere along that route. Now trying to run a bypass wire without tearing everything up.

[Christian]

Sounds like the botched jumpstart burned out a wire. Track that bad boy down and you should be in business.

[ducpainter]

Sounds like the botched jumpstart burned out a wire. Track that bad boy down and you should be in business.

burned up grounds are pretty common with Marelli ecu's