I have still found little hard data, but some suggestion that a petrol engine needs more air & fuel than that to maintain idle, perhaps up to 3:1 turndown, or 33%, or 33kPa. And that would stack up with positive fuel trims that increase (presumably) the amount of fuel injected, above the baseline pcm mapping for the given MAP reading & RPM. Ford Model: ford focus 1.8 zetec mk 2.5 petrol Ford Year: 2008 UK/Ireland Location: Ford Model: 1.8 TDCI Mk2 Focus Ford Year: 2006 UK/Ireland Location: Dorset Name: Gareth. Ford Model: Focus. Ford Year: 2007. UK/Ireland Location: Gloucestershire. Posted March 4, 2014. Really common problem we have seen on the 1.6 TDCI that come into us with DPF problems is that the rubber hoses that sit between the DPF and differential pressure sensor becomes brittle over time and breaks. rhyds. Budding Enthusiast. 143. Name: Rhyds. Ford Model: Focus MK2.5 1.8 Zetec. Ford Year: 2010. UK/Ireland Location: Gwynedd. Posted August 11, 2019. My 2010 MK2.5 Duratec 1.8's battery may be getting towards the end of its useful life. its an AA one fitted by a previous owner and so doesn't have much in the way of labelling. Ford Model: Ford Focus Mk2 LX Petrol 1.6 Ford Year: 2005 UK/Ireland Location: Co-Antrim Author; My dad has a Ford Focus 1.8 petrol titanium, 2009 model. Can it Leak in a fuel line or filter housing, is the most likely culprit. All the lines up to the main pump are under some suction almost all the time, so air will be drawn in, no fuel will leak out. Once the 1.8TDCI gets any air into its fuel system, it is a pig to start. 2. It is a 2006, LX, MK2, Automatic. IF it going to be troublesome it will do any of the following: 1. (Most Common), Starts and then Dies. Will normally start 2nd or 3rd time of asking. 2. Starts on about half power (500 revs), then within a few seconds powers up properly and stays running. 3. Ford Model: Focus Estate mk2 1.8 Flexifuel ford focus 1.8 zetec mk 2.5 petrol Ford Year: FIESTA RUNNING PROBLEM. Name: Russ. Ford Model: 1.6L Focus Titanium mk2 facelift. Ford Year: 2008. UK/Ireland Location: WestLothian. Posted July 12, 2017. You can remove the jets, clean the area and put a little sealant on them when you replace the jets in the bonnet apertures, or you can buy new jets with seals on them. Quote. You don't say what focus you have mk1 /2 /2.5 will help people give advice by looking at the photo I think it might be the reverse light connection check with it off then attached usual suspects for coolant leak are water pump and thermstat housing what side of the engine is the leak from cambelt end pos water pump gearbox end pos thermostat housing front of engine on a 1.8 TDCI thermstat IrLVkJ.