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  1. Mk3 Petrol Engine, Exhaust and Induction
    Hi chaps! Getting to grips with the Mk3.5 ST-3 I got a few weeks ago and trying to get all the key bits I need to get done to keep her ship shape and learn about the car. One thing that I wanted to check if it’s normal or not is this deep sound - it sort of sounds like air coming out a tunnel...
  2. Mk2 Turbo & Intercooler
    Hi guys how’s it going this is a topic that’s quite frequent yes I know but would like to ask again I’ve got a stage 2 mk2 st that’s running about 337bhp and 540nm it’s had a fresh head put on few months ago with new valves etc how ever my turbos starting to smoke now so looking at going bigger...
  3. Mk3 Diesel Engine, Exhaust and Induction
    Hi guys, Just recently bought a 2015 Focus ST MK3.5. She’s a 2L diesel car. When I was driving it, the engine service notification came on the dash and the car lost all boost. When I turned it off and on again, the boost came back and when I drove her hard, the boost never went above 3/4...
  4. Mk3 Petrol Engine, Exhaust and Induction
    Hi guys just recently got an ST and it come up with two fault codes and sometimes the car shakes when I turn the engine off, like it’s struggling to stop. I’m not sure if it’s due to a poor map being put onto it or if it’s over fuelling it’s self as it’s has not got a resonator on it and pop...
  5. Mk4 Engine (Petrol)
    Hi, I've been doing some data logging as apparently my car is heat soaking and also low on power and wanted to get an opinion on the below graph: When I increase the accelerator position (Light blue) whether quickly or slowly the throttle position (Dark Blue) jumps up to between 80-90%, but...
  6. Mk3 Petrol Engine, Exhaust and Induction
    Hi I recently got a ford focus st3 2015, I was sat in the car at idle and could hear slight whinging noise, I decided to have a look around in engine bay, didn't find the problem but I noticed when I opened the oil cap there was suction from the filler hole is this normal?
  7. Focus ST Mk2 Non Technical Discussion
    Hi everyone im looking for advice not to blame anyone or to damage anyone reputation. Ive had a engine fully forged and linered block. Done the 1k miles as advised and bit over. Had oil changed when i should and they checked oil pressure and other things. Everything fine. Today i took my car to...
  8. Mk2 Engine, Exhaust and Induction
    Hi all, the weirdest thing happened at a set of lights on Sun.... when I went to pull away the engine cut out, upon starting up again the bonnet open warning light flashed up for a few seconds. I naturally pulled over and bonnet was fine. I'm thinking the two are unrelated or has this happened...
  9. Mk2 Engine, Exhaust and Induction
    Hi All, I'm seeking some advice from those that may have been in the same situation before or those who are in the know. Long story short had a coolant pipe blow and has killed the engine. my mechanic has pulled the head off and found the damage. Cylinder No2 piston has melted and cracked the...
  10. Mk3 Interior, Heating, Air Con, Noises & Smells
    Hi all, I’ve seen plenty of discussion about how generally rattly the ST250 engine is, particularly its signature rough idle and noisy injectors. However I can’t help but be narked by a certain rattle / ticking sound… it seems to be linked to engine speed, is quite faint but can be heard when...
  11. MK2 Focus ST parts For Sale or Wanted
    Hi there, I'm after a lump for my ST225, preferably local to East London/Essex. Lower mileage is better, and preferably from an unmodified vehicle. Whatever you have available, let me know and how much and I'll get back to you. Also, if anyone knows where else to look for one, please let me...
  12. Mk3 Petrol Engine, Exhaust and Induction
    Hi guys Quick question regarding the pfl and fl engine codes above , will the R9DC facelift engine plug straight into my R9DA loom with no issues and run of the original key etc or is there a difference ? Need to know as Im looking for an engine Thanks
  13. Mk3 Miscellaneous
    Hi guys Engine on my St ******* itself today unfortunately ! Snapped bottom part of the spark plug 4 and engines siezed also . Anyways anyone done a thread on engine removal on pre facelift mk3 st? Im gona pull the engine out next week but just wondering whats quicker , out the top or front...
  14. Mk2 Miscellaneous
    Hi advice please as my oil filter housing diafram is starting to leak oil ,any body fitted a refurbished oil filter housing unit as there half the price of a new one and any issues with them. Thanks in advance
  15. Focus ST Mk2 Non Technical Discussion
    Hello all I am the very proud new owner of a car I have been after for about 10 years, a bright orange focus ST! 106k on the clock FSH cambelt done, shocks done etc basically a model car no modifications it is the original all the way. I was having a play as you do and I noticed that the heat...
  16. Mk2 Engine, Exhaust and Induction
    Hi all I was hoping for some much need advice for a first time poster. I have a 06 plate st 2 driving home I noticed that the boost gauge wouldn't go to half also seemed sluggish then I descovered when i got home an oil leak from rear of the engine, when I open the oil filler cap or pull out...
  17. Mk3 Suspension, Steering & Chassis
    Hi, I am looking for an upgrade to my stock engine mount... and a little bit confused. So many around with different prices and loads of different positive and negative feedbacks. Anyone can suggest the best one for a daily drive? Anyone had a chance to compare them? Which one will keep NVH...
  18. Mk3 Petrol Engine, Exhaust and Induction
    Hi guys and gals. Been having a extremely odd intermittent fault with apparent overheating. Occasionally (becoming more common recently) the temperature gauge will suddenly shoot up to maximum and the car will sound the obvious warning bells and messages to tell me the car is overheating...
  19. Mk2 Gearbox, Clutch & Running Gear
    Now this is really hard to explain, but this is a intermittent issue. Basically this happens when I pull away at times but say I'm in first and then lift the clutch and start to pull away with some throttle I get like a slight hesitation and a weird machine gun sound like say the ESP is kicking...
  20. Mk3 Petrol Engine, Exhaust and Induction
    Hi Guys, I own a 2015 ST3 with the Mountune MP275 kit fitted. I picked up some Genuine Ford spark plugs for a reasonable price (I didn't need them just yet but bought them early because of the price). Anyway my car has just gone over 21k miles so i thought id inspect my spark plugs. All...
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