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Message: [QUOTE="Lethalthreat7.3, post: 1198284, member: 10651"] Ja cain I understand what you are talking about on the vfd's, used to have any issue with Infinity drives. I am referring to the "back-flash" transient surge that is created when a magnetic field collapses. The IDM is designed to absorb these but over time from vibration, corrosion, component age as well as design, well the system can have issues. Think about it like this. The injectors are AC driven to energize, "magnetize", the solenoids. When the pulse is stopped the magnetic field collapses and there is a sudden very quick surge. This "back-flash" has been seen as high as 1000vac which is "absorbed" by the IDM. Why do we shunt at a component? To absorb any EMI or RFI that may be created so that it does not "travel" along the wiring. Now if you happen to have a shielding or surge issue to/from the injectors it must be absorbed by the IDM but the distance from the injector banks to the IDM itself along with the 42pin connection and running parallel along all the DC sensors, well you can create an "antenna amplified" effect. This is why shielded wiring is only grounded at one end(otherwise you create an antenna). The idea is to absorb any transient surge, EMI and RFI that is produced. I've done some more "suppression" modifications at the uvch connections using extremely strong ceramic magnets to create a "boxed magnetic field" to run just the AC injector wires thru. Although I haven't looked at it with a scope, it is definitely noticeable in how smooth the engine runs and it has cleaned up the "noise" on the LCD of my monitor. I'll be working on building a different type injector harness over the next week or so as I found some old IDM/Inj connectors in my stuff(junk as my wife would say). I am on a mission now to build a harness specifically to address this. Still curious as to wether anyone has tried the ground issue/wiper motor/MFS circuit repair or replacement and the results. [/QUOTE]