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Some very interesting DI info from Andy M in this? thread on the 9000 forum.
It appears that the problem with Andy's DI cartridge is that one or more of the sockets may have had some dirt/contamination causing an insulation breakdown, and thus loss of spark energy.
So, it may be that some intermittently faulty (esp under high boost) DI cartirdges are not faulty at all, but just need a clean and re-application of silicon grease. I will post a follow up later today with pics of how to do this.
New DI cartridges have silicon grease in the plug sockets to help prevent ingress of moisture and provide an insulation barrier.Well A month down had a major service and still no joy all the mechanics were baffled!. So as anyone who has a dad as a mechanic would do!!!Got out the wd40 and sprayed all the terminals around the DI cartridge and then turned it upside down and sprayed down the ends where the plugs make contact, Rinsed it a couple of times put her back together and fired her up My God it idled perfect and drives like its made 30bhp. Wow its better than my last car(what isn't) Anyway after months of thinking I'd bought a nail hey presto a cheap can of lubricant and its just amazing.[/b]
It appears that the problem with Andy's DI cartridge is that one or more of the sockets may have had some dirt/contamination causing an insulation breakdown, and thus loss of spark energy.
So, it may be that some intermittently faulty (esp under high boost) DI cartirdges are not faulty at all, but just need a clean and re-application of silicon grease. I will post a follow up later today with pics of how to do this.