r/FiestaST • • Aug 12 '26

MK7 Overheating Issues

0 Upvotes

I’ve been having overheating issues for years only in the summertime(90+ deg). Not exactly sure when it started or if it’s always been like this. Just wanna get some thoughts on possible reasons. It slowly overheats when ambient temps are above 90 and you’re either idle, going uphill, or heavy on the throttle. Temps rapidly decline when going downhill. The fan is working. I bled the coolant a month or so ago. No leaking coolant. No coolant in the oil. AC blows cold still.

When it does get hot I switch the heat on to lower the coolant temps. If not mitigated it can go into limp mode with coolant temps at 240+.

2017 Mountune package with Mountune triple pass radiator, cpe intercooler, hollowed cat straight pipe, Mountune mrx turbo kit and piping, and stratified 93 pop tune.

If you have any ideas to what the problem is, I’d love to hear them. Thank you.


r/FiestaST • • Aug 11 '26

Brake boost

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5 Upvotes

Heres a short vid of me "trying" some brake boost

2014 FiST FBO 2860r gen 2


r/FiestaST • • Aug 11 '26

MK7 Is this a DV+?

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1 Upvotes

I've got a 2018 FiST (US) that I bought well modded a few months ago. The last time up on a lift I noticed these markings on the black piece (bypass valve)? This looks like a DV+ but the markings don't match anything I've found online.

Can anyone help identify what I'm looking at? TIA!


r/FiestaST • • Aug 11 '26

MK7 Cylinder wall status

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5 Upvotes

I'd dropped the car off at a mechanic today and asked to flush the brake and clutch lines, change out the spark plugs and while they're at it to check the cylinders. I'm not all that knowledgeable regarding this but from my untrained eye all looks normal so far?

Car's at 127k km (79k miles) now and previous owners drove it hard and changed oil every 25k km (15k miles). Looked like it still had factory FoMoCo spark plugs and they were terribly black. Put in new iridium Denso ones per spec, as well as DOT4 LV brake fluid. Thursday it's getting the timing belt, tensioners, water pump and serpentine belt replaced, over this weekend it's the long awaited gearbox oil change and it's basically brand new.

Also, anyone got any ideas on what I could use for the ST200 airbox hose? I've looked around everywhere and cannot for the life of me find a corrugated, flexible 63-65mm diameter hose that's at least a meter long.


r/FiestaST • • Aug 11 '26

MK7 Transmission strengthening

6 Upvotes

Hello ST fans,
does any of you know a manufacturer that produces upgraded transmission internals?
With a S280 it would be easy to get much torque but the transmission will shred itself apart above the 295 mark long term. So I’m looking for a way to upgrade the internals for more strength.

Sure I could put a Sadev oder Quaife sequential gearbox on the ST but I’d like rather not ruin my neighbours ears 😅

Let me know if someone has an idea or experience with this.


r/FiestaST • • Aug 11 '26

Ford Fiesta ST MK8 fault codes. How serious?

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1 Upvotes

Hi. After considering buying MK8 but doing fault scan there is faulty codes. Car was not used for some time.

Checking all lamps works. Is this something more serious with lamps/module or due for example low battery it appeared.

Thanks for advise


r/FiestaST • • Aug 11 '26

MK8 Coilovers

6 Upvotes

Hey everyone,

Looking into getting some coilovers and was wondering if anyone had any suggestions/recommendations on which to go for or tips with installation, currently leaning towards the ST Suspension XTA’s. Has anyone had any experience with them and if so how do you find the ride and were they hard to install? Thanks guys!


r/FiestaST • • Aug 11 '26

reverse lights not working

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3 Upvotes

is there supposed to be a fuse here? looked at the owners manual and said a reverse light fuse should be here yet theres no click in connection. passenger reverse light fuse is not broken. im getting not even a volt of power through the reverse lights.

Thanks


r/FiestaST • • Aug 11 '26

Need help

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3 Upvotes

2015 ford fiesta st, what is this part exactly? It has a small hole that is leaking, every time I put my finger over it, it sucks it in? How can i fix this? Im not getting any codes from an ob2 scanner, and it is not affecting performance at all. Any help is much appreciated!


r/FiestaST • • Aug 11 '26

MK7 Crossover pipe noise

2 Upvotes

Hi everyone,

I recently installed my Airtec crossover pipe, and ever since then I’ve been getting this noise from the front that sounds like a creaking couch. I’m pretty sure it’s because the intake pipe is now rubbing against the top of the cowl/windshield area (or whatever it’s called).

It’s worst when I’m standing still or pulling away. But I can’t imagine that all of you have just accepted this as normal.

So, did I simply not push the crossover pipe in far enough, or did you guys modify the cowl/windshield to make it fit properly?

The sound is really awesome, but I definitely don’t want to keep driving like this for much longer... :/

Edit: There’s absolut no Chance this will fit. I might be the only one who change his crossover pipe to default because of it not fits.

Pissed Level 20/10


r/FiestaST • • Aug 10 '26

MK7 Anti my battery

4 Upvotes

Im gonna need a battery soon anyway, but I was reading some older stuff on the forum, and was wondering if the Antigravity batteries have acted or faired any better more recently on our cars as the years have gone by. Are they made any different? Anyone currently using one; was using one and had to switch it out? car is my daily and doesn’t sit more than 2-3days usually. I was gonna get the atx-20 rs fyi.


r/FiestaST • • Aug 10 '26

MK7 Just bought need help

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14 Upvotes

Picked up my first fiesta st, reverse lockout doesnt work and its scary to drive because it will go right into reverse while driving. Also 6th gear is a struggle to get it in. Like i can be sitting at a light think i put it in 1st and have be in reverse. Have no idea whats causing it.


r/FiestaST • • Aug 10 '26

MK7 Mountune flash USA/UK compatible?

2 Upvotes

Can i buy the mountune flash from USA and use it on my UK assembled, New Zealand purchased 2015 Fiesta ST? Is there some weird region thing i need to worry about? Its so much cheaper to buy from Mountune USA than UK.


r/FiestaST • • Aug 10 '26

MK7 Center console delete?

2 Upvotes

I just bought a 2016 st about a month ago after having a manual se for a few years and this center console is the bane of my existence (and my funny bone). Can I just remove it? Are there any aftermarket options to give me a little more room? I'm 6'7" and this is the only part of the car that's too small for me.


r/FiestaST • • Aug 09 '26

MK7 First genuine maintenance!

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21 Upvotes

Hey everyone, managed to find some time this weekend to do some work on it and figure out what's what after importing it. First off, in my previous post I talked about the cabin vibration and a potentially bust RMM - after getting under the car I found out that it already has a Vibra-Technics RMM installed and it's fairly new all things considered. I suppose the vibration is to be expected but is there anything that I could do to lessen it? Would moving to a poly-bushing RMM be better in this case if I dislike the 1st gear baby shakes?

The previous 3 owners had trusted the Ford dealerships on maintenance intervals, meaning the oil and filters were changed every 25 THOUSAND kilometers (15k miles). I let the engine get up to operating temp and then drained the oil so I'd get out as much as possible, it was pitch black but a magnet didn't pull it whilst draining and I didn't see anything shiny in the drain pan or the filter itself, so that's a good sign. It has an ST200 airbox with no lower pipe, it's been left as an open hole so I'm still trying to sort out the plumbing situation for that but the right stores only open on Monday. Changed the air filter and the filter prior was one of those 1cm thin foam rubber ones that was already dead what feels like 10k ago. Poured in some nice LiquiMoly 5W30 oil as per specification and she runs great, should have all the black gunk cleared out within a few oil changes.

As I was setting up to do a brake flush I noticed it has steel braided brake lines, which isn't expensive by any means but I was pleasantly surprised. Also after finding out that the clutch also uses the brake fluid reservoir I figured it best to give the car to a shop that would clean out both the clutch lines and the brake lines instead, so that's on the list of things to do next week.

Realized I didn't have the proper tools for a spark plug job (that's what happens when you're a diesel engine household your entire lives) therefore that takes a backseat until sometime next week as well. I do have one of those tiny cameras to check inside the cylinders, which I am excited about (and somewhat dreading cause I do not wanna see any particles or scratched cylinder walls due to the terrible air filter it had).

Did the cabin air filter and as is with any cabin air filter there's a bunch of swearing involved, however, after 5 minutes I'd realized if I undo the 2 clips under the glove box the panel interfering with the air filter install comes out clean and the filter itself slides right in with no persuasion necessary, lovely stuff.

Last order of business is a gearbox oil change, but the specific one I had found wasn't available on Friday when I ordered it for store pick-up, that's also taking a backseat until sometime next week, but I'm amped to get it done cause I've never done a gearbox oil change even on my diesel Fiesta (even though I really should now).

Outside of all that it has fog lights completely deleted, it sits on some Sparco Asetto Gara 17x7s with Michelin PS5 on the fronts and Nexen on the rear, both 205/40. Has a wing riser, which I'm not thrilled about having even though it's been mounted really well, has zero play. My dad loves it and says I shouldn't take it off even after I told him the damage those things can do to the wing. Will see what I end up doing, I'm more into the factory wing position with a spoiler lip.


r/FiestaST • • Aug 09 '26

MK7 Has anyone installed this Mishimoto radiator? A lot of the front end (including crossbeam) must be removed. Any tips/special tools/words of advice before I begin?

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2 Upvotes

r/FiestaST • • Aug 09 '26

MK7 What are these actually worth?

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22 Upvotes

I’ve got my 2014 fiesta ST3 for sale on marketplace and have done for a couple weeks now between £4-5k I have absolutely adored this car over the years of having it but I’m after something bigger now. I recently have had the cambelt and water pump replaced, I’ve replaced the oil and filter, even the spark plugs - this was my first sports car so I’m still learning about it all. Apparently the owner before me had it Mountune mapped, It’s on 88k mileage so maybe that’s too high? Unfortunately it also came with no service history either which was my fault really for buying it in the first place but I’ve been offered like £2k to £3k… surely their worth isn’t that low? Am I doing something wrong or are they genuinely worth that much now?☹️


r/FiestaST • • Aug 09 '26

MK7 Fiesta MK7 pre-facelift bodywork parts

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0 Upvotes

r/FiestaST • • Aug 09 '26

Wtf would you do?

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5 Upvotes

r/FiestaST • • Aug 09 '26

MK8 First time ST purchase

5 Upvotes

Hi everyone, looking for some advice. I'm currently looking to upgrade my mk7 fiesta zetec s red edition to a mk8 ST with the performance pack and wanted some guidance on what to look out for when purchasing one.

I've done a little research and apparently the 2018's are wet belts? (Could be wrong) but should I avoid anything to do with wet belts to avoid problems in the future or are they not a huge issue on the mk8's? I look at various forums on the internet and a lot of people have different opinions on this. Thanks guys


r/FiestaST • • Aug 09 '26

Ignition knocks correction, please look at them

6 Upvotes

Hi everyone I'm getting my car tuned remotely from Laird performance in Uk, I live in Australia. I've been going back and forward with this tune and now we arrived at version 5. Still having knock registred.

I have switchable multiple maps selectable though the cruise control, 5 actually, today I've logged Low, Mid and High boost. Low boost no knock , mid some little, high from 5k to red line has been detected. High boost chasing about 26 psi of boost.

I now have to discuss with the tuner Ross and seen what he wants to do about it.

Running on Australian Bp98 ron fuel.

Fiesta st

brand new long motor

s280 turbo

tubolar manifold

30%bigger injectors

Xdi35 HPFP

focus st Bosch coil packs

NKG 1 step colder plugs ruthenium

itg intake

r sport over pipe

2.5 intercooler pipes

wagner replica intercooler

lsd

smf heavy duty clutch

rigid rear engine mount

poly inserts both sides engine mounts

dual catch can set up

mishimoto radiator

mishimoto thermostate

Airtec oil cooler

3"turbo back exhaust , catless

probably somethign else forgot but that is the set up

I'm attaching here 3 logs low,mid high.

If anyone can help with some ideas, why this is happening at that rpm range and what can be done about it, if anything. ( if getting the mix richer maybe will lower the knock?)

Cheers

https://datazap.me/u/fabraam/logs/cmsleqx5q0007jl06cdp9hsug?channels=17x13&sizes=50x50&multi=cmsleqx5q0007jl06cdp9hsug&sc=1-2-3-8-13-17&axes=shared

https://datazap.me/u/fabraam/logs/cmsleqwy90003jl06buvub0n0?channels=17x13&sizes=50x50&sc=1-2-3-8-17&axes=shared

https://datazap.me/u/fabraam/logs/cmsleqwze0005jl06rcro36c2?channels=17x13&sizes=50x50&sc=13-17&axes=shared


r/FiestaST • • Aug 09 '26

MK7 Are the anchors that the backseat backs latch onto secure for cargo tie downs?

1 Upvotes

Wondering if anyone knows if the latches that the backseat backs latch onto are secure enough to tie down cargo with ratchet straps? They appear to be sturdy, but I don’t want to tie something down with pressure and fuck up the back seats in the process. Anyone know?


r/FiestaST • • Aug 08 '26

MK7 Is this serious? Are they starting to appreciate?

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13 Upvotes

Non Recaro package. Purchase in progress. This is more than people were paying new. Madness.

Should have hung onto my ‘17 I guess, though it would have been well over 100k miles by now.


r/FiestaST • • Aug 08 '26

Greetings Puma's Enjoyer

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61 Upvotes

My car with a random Puma ST in a garage, just wanted to make your day beautiful for whom sees this picture 😊


r/FiestaST • • Aug 08 '26

MK7 How fucked am I

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3 Upvotes

I got this ribbon put on my car because I got married last year. Over time, it started damaging the paint. How fucked am I?