Rss Posted October 23, 2022 Report Share Posted October 23, 2022 Hi I have a golf r mk7.5 and I noticed the other day I had very little boost and checked the fuses and F9 had blown (ignition coil) I changed it the car was fine now it has done it again and will constantly blow as soon as I change the fuse. Has any one has this before if so any help would be appreciated thanks. Quote Link to comment Share on other sites More sharing options...
gregozedobe Posted October 24, 2022 Report Share Posted October 24, 2022 Sounds like a short somewhere - often this is where the wire has chafed/worn through and is shorting out against a metal part somewhere so can be a bit tricky to locate. Maybe isolate (disconnect both ends) each part of the circuit and do a continuity check to earth to locate it ? Rss 1 Quote Link to comment Share on other sites More sharing options...
fastandy Posted October 25, 2022 Report Share Posted October 25, 2022 yeah, wiring or an ignitiion coil itself is causing it? If you know someone to "borrow" their coils you could try that. I can't recall having any cause blowing fuses but they do fail or fail under load causing misfires. If you have a friend with a VW specific scan tool like VCDS or OBDeleven i'd get a full scan and see if it points to anything. Quote Link to comment Share on other sites More sharing options...
Rss Posted October 25, 2022 Author Report Share Posted October 25, 2022 Perfect thanks guys I’ll try changing the coils as I can’t see anything by eye to do with the wiring. Quote Link to comment Share on other sites More sharing options...
gregozedobe Posted October 25, 2022 Report Share Posted October 25, 2022 1 hour ago, Rss said: Perfect thanks guys I’ll try changing the coils as I can’t see anything by eye to do with the wiring. Chafing is usually hidden away somewhere hard to see , unfortunately. That's why I suggested an isolated continuity test. Rss 1 Quote Link to comment Share on other sites More sharing options...
Darkr18 Posted March 29 Report Share Posted March 29 Did you ever figure it out? I keep blowing f9 as well but codes that come up all point to fuse f4. I cant find an accurate fuse diagram for anything Quote Link to comment Share on other sites More sharing options...
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