MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: GTI_Kyle on June 19, 2017, 10:06:33 am
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Need some help with a bad misfire on my stg2+ FL Leon cupra has developed. It starts ok but sounds really rough with a constant misfire, almost like a Scooby sound. It's in limp mode aswel with the EML flashing sometimes, plugged it in with my basic scanner & it come up as a misfire on cylinder 4 P0304 code.
Changed coilpacks & spark plugs but still same. I suspect maybe a bad injector or bent valves?
Anyone else had this problem?
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Very common, will be a duff injector..... Get someone with VCDS to look at the misfire to check its only that cylinder and that its a regual idle misfire that will probably clear up once revved..
Once confirmed, get it sorted ASAP and don't drive it about hard at all, as its a potential engine killer
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I had to limp it home but barely went over 25/30mph due to being so down on power. Hopefully it is just an injector and not bent valves!
Is there any particular reason why injectors give up?
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Common issue on the K04 engine cars.... Could just be carbon build up - ideally all 4 need to be tested and balanced.... R-tech offer this, whether you just send them your injectors or book in to have it all done for you
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I've had the inlet cleaned & RFD fitted recently mate so won't be carbon build up. Might consider sending them off once the problems diagnosed.
Is there any differences in symptoms with a bad injector & a bent valve?
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Update - compression test done & there is no compression on cylinder 4. Other cylinders are fine.
Once the heads off will have a better idea what the problem is...