Mikes Posted June 19, 2017 Share Posted June 19, 2017 My wife's Focus has picked up an odd issue and misfires when warm. It started off as an intermittent thing, but now every time the engine warms up it misfires from around 2K-3K and struggles to tickover. I have cleaned the MAF and put some Wynn's into the Inlet Manifold for the EGR Valve. I am thinking maybe the Glow Plugs, but can only access 2 of the 4. The EGR is a bugger to take off as only 3 of the 4 bolts are accessible. Any ideas welcome? Mike Quote Link to comment Share on other sites More sharing options...
Mikes Posted June 19, 2017 Author Share Posted June 19, 2017 I am going to replace the Fuel Filter tomorrow and oil + Filter. I will also take the EGR Valve off as I think it was the Fuel Filter blocking access to the final bolt. Quote Link to comment Share on other sites More sharing options...
Dee_82 Posted June 19, 2017 Share Posted June 19, 2017 diesels don't miss fire as such. do you mean that it losses power under acceleration which will feel like it hesitates.? If so then its probably your fuel filter, potentially DPF. Could be a bunch of other stuff too but fuel, either the filter or the pressure sensor, would be towards the top of my list. Quote Link to comment Share on other sites More sharing options...
Mikes Posted June 19, 2017 Author Share Posted June 19, 2017 Thanks for the reply. It is like a juddering/complete flat spluttersy spot between 2-3K, but only when warm. It's gradually gotten worse over the last couple of days. I am changing the Fuel Filter/Pump tomorrow. I will see how I get on! Quote Link to comment Share on other sites More sharing options...
Dee_82 Posted June 19, 2017 Share Posted June 19, 2017 your changing the pump? that's an expensive start. do you have an ELM327 device and forscan to use? this will help narrow down the problem if you don't, we highly recommend picking up a device from http://www.spanglefish.com/TunnelratElectronics/index.asp?pageid=516992 Ive got a few of them and haven't found a dud. the chap is dead good if you need to contact him for anything as well Quote Link to comment Share on other sites More sharing options...
Mikes Posted June 21, 2017 Author Share Posted June 21, 2017 Fuel Filter, Air Filter, oil, oil Filter all changed. No difference and the car splutters and jolts forward quite harshly around 1500rpm, but only when warm. It is doing something new, it is now in Limp Mode and I have the yellow engine light on. I will check it on the code reader later. The garage said it was picking up a DPF fault code, but this was changed about 18 months ago and the sensor about 6 months ago. Quote Link to comment Share on other sites More sharing options...
Mikes Posted June 21, 2017 Author Share Posted June 21, 2017 Ash Accumulation fault code, which is odd and may just be due to being driven on tests to find out what was causing the juddering/spluttering....? Not sure of the next step. Quote Link to comment Share on other sites More sharing options...
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