Focus st 225 boost leak. Oct 12, 2018 · Boost leak? Jump to Latest 2.


  •  Focus st 225 boost leak. BOV clearly opens and closes normally, but then I hear that noticeable "pssss" sound again a few seconds later. Check the symposer plate for any leaks too. Feb 11, 2024 · So I got my external wastegate (14psi spring) gtx2971 with arc enemy turbo elbow installed this weekend everything seems fine no leaks. How best do I go about pinpointing the issue? Apr 25, 2020 · After telling people about boost leaks probably at least 100 times this week ( no kidding) here are a few very quick tips to know if you have a leak if you have a STOCK TURBO Focus ST. May 12, 2016 · Also over the winter my boost never went above 16-18 psi. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Dec 27, 2012 · Hello there, ive been having a few problems with my focus recently, its a 53 plate 1. Run the engine. Same oil drop. My Boost gauge is marking around 13-15psi when then rpm’s are at 3500-4000, once the engine gets to 45000 i start to lose power! Has anyone else had this issue? Mar 10, 2018 · Go and recheck all vacuum hoses and boost pipes making sure to tighten - better still get a boost leak check done. I have replaced the Boost Solenoid and the problem still persists Feb 9, 2016 · I believe I have developed a huge vacuum / boost leak (after throttle body) and I want to test. to/40hoSIV (AMAZON) CAP plugs https://amzn. They get dirty and stick open, reducing your boost. I was wondering if there was a main spot that boost leaks happen? Or if someone recommends where to start looking first? Sep 8, 2020 · Hi, I have recently purchased a focus ST 225 (again) and a few weeks after the purchase, I’m now having boost issues. Jan 30, 2020 · The RS engine copes somewhat better than the ST. Lately I've noticed my car isn't making more 18-19 lbs of boost which u think is odd because I use to easily hit 23-24 Aug 31, 2018 · My 2013 ST just developed new problem. I am no longer hitting full boost. Ive noticed the coolant is going down very quickly, the rac and another garage have looked at it and cant find any sign of a leak. Jun 17, 2016 · The PCV's job is to close under boost from the intake manifold to prevent pressure from entering the block. Under acceleration, when a certain boost level is attained, I get a loud BRRRRRT noise from engine compartment along with vibration/shuddering. Its pretty easy to get to from the passenger wheel well, and its just 3 bolts holding it in. If you have a compressor you can pressurize your system or use the soapy water technique to check for leaks. thought maybe I have a boost leak so double check/re tighten all connections, still only boosts to 9. just trying to see where else I should look and also can an exhaust leak cause a boost leak? May 20, 2024 · I’ve done boost leak test after boost leak test, filling the system to 26 pounds and soaping everything, and even filled and let it sit for an extended period of time. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! After taking it for a pull back and forth, it hit 18psi in 2nd and struggled to reach 20psi in 3rd and noticed the sound of what i think is a boost leak. From what I can figure I'm about 4lbs shy with over boost and normal boost is only hitting the half mark on the stock gauge. Jan 29, 2019 · The boost leak in the cold side pipe-symposer rubber hose, recirc, maf sensor and the tiny leak in the maf sensors pipe. Had that a few times. Accepting bourbon, bullets, or cash donations. Invest in the 20-30 dollar boost leak tester, and test away. And when pulling off it sounds as though I have a 'air' sound as though I'm leaking boost or air sucking I have an uprated forge Oct 12, 2018 · Boost leak? Jump to Latest 2. The same test is used for any turbocharged automobile for the last 40 years plus. Aug 30, 2024 · The Ford boost solenoid is a common "wear and tear" item, You can detect if you need a replacement when your car starts to loose response or hesitates when driving or if boost levels are dropping. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Mar 23, 2018 · hey guys have a question where else should I check for a boost leak??? was driving yesterday and notice I could not hear the bov (turbosmart) then I noticed my car was dragging and was only hitting 4. The Dirty Duecette Mar 24, 2023 · Waste gate opening prematurely, only making 2PSI! boost issue boost leak no boost stage3 wastegate Jump to Latest 3. The only way to prevent overspinning the turbo would be to disconnect the WGA completely or stall the engine. Video highlighting my current boost issue on my MK2 Focus ST. Jul 5, 2022 · I have a 14’ ST that is currently getting mapped to stage 3, running acceletec catted dp. I bought a Focus ST earlier this month, was a steal at the price I paid but did have its little issues, one of which being an oil leak After loads of internet searching I found that a common leaking point is the oil pressure Feb 9, 2012 · i just been flicking around the jwr sponner link and i came across a topic removing the Symposer ? so now i am thinking what dose it do . I was on my 3rd map when my tuner said that my car has developed a boost leak. PM to find out how! Duece's Wrench worx. There is oil in my intercooler pipe. Checked Dec 10, 2022 · Thing is, when the engine is idling the oil pressure is low. If you're having doubts its just a good idea to get under the car and check all your connection points. The issue started a while ago (about a year and a half) when I went from a Cobb stage one 93 tune to a stratified burble tune. I checked my coolant it was a little low so I filled it up today going to see if it goes down any. Can this be fixed by running the true vacuum line from the symposer delete? Sep 29, 2014 · If the leak doesn't happen until you're into boost, I doubt you'll hear it at idle. Feb 23, 2023 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. Any ideas? Apr 11, 2015 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. I would remove the BOV from the pipe and block it completely. So snug up the filter and dry it off. But, also look at whether the sensors or boost solenoid are problematic. I read that sliding the seal on the input shaft that the splines can cut the seal and cause it to leak, and that you should put tape over the splines and then slide the Feb 2, 2017 · Hi everyone! i have a problem with my ST, if i give it some beans it quicly overboost and then goes limp mode (the power is cut at 4000 rpm) if i shut off Nov 28, 2018 · Some googling showed a loud whine is common with turbo failures and my car would start to whine pretty loud around 4k, boost or no boost. Newly registered on the forum but browser quite a lot. Does the ST only make boost under hard acceleration or heavy load? I realize that smaller turbos won't make boost while revving in idle, because the car isn't under any load, but it appears this car rarely is. Restore or replace the broken parts. Noise occurs both stock and w/tune. It still ran but not well, but I did get it home to look at it. After hours of searching and removing components from the engine bay, I believe I have located the source. I've noticed that I have a oil leak around the breather hose I've tightened it up as much as I can but I can still smell burning oil. After about ten minutes of starting the car and when it hits temperature, the car will only boost to 4000RPM and then just completely dies off. When i was driving the other day the engine warning light came on and the car Oct 25, 2013 · Since I got my car my boost never really ever hit half way mark on the gauge. I have a 2017 focus that plays up sometimes and chucks a cloud of greyish smoke out the back under heavy boost. The drop reappears. Car being warmed or anything it still continues. Decided to pull over and reflash the car to stage 0 and it immediately boosted Aug 12, 2021 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. May 14, 2024 · Get the coolant system pressure tested to find the leak, there’s a few more common suspects, but you still need to find the correct one. I had a leak in the coldside pipe to symposer hose but fixing that did not cure the problem. 2 weeks later I check again. This is the reason for an additional vent on the highest point on the engine. May 19, 2019 · The boost solenoid is a common component to fail on the ST225. Upgraded intercooler aswell as some other stuff but those are the big ones. Is this normal? Jul 25, 2024 · Currently I’m having boost cut or like some type of boost leak where I can’t build up pressure. About the recirc leaking through piston, that is normal for the TS recirc. 4K views 12 replies 5 participants last post by ZapterX Mar 24, 2023 ZapterX Discussion starter Sep 26, 2014 · So I made a post complaining about high idle. Jun 25, 2023 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. At first I thought nothing of it since it had just had an oil change. If I were to pressurize the system at the turbo hot side outlet, how do I make sure the throttle body is open so I can test all connections all the way up to the head/intake valves? Thank you in Jul 29, 2020 · Boost leak test will show if theres any vacuum line damage as well. Apr 7, 2021 · Is it possible to leak boost at the Intake Manifold Map Sensor (MapTap)? Jump to Latest 5. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Sep 24, 2013 · Go and recheck all vacuum hoses and boost pipes making sure to tighten - better still get a boost leak check done. i got the flange, mounted it and it dumps all psi out. The boost leak tester will make it quite obvious where the leak is. Sep 20, 2022 · So I noticed yesterday I was only averaging around 16lbs of boost, when I am usually at around 22-23. Buy or make an adapter, connect it directly to the turbo inlet, test a little higher than operating pressure Nov 9, 2020 · Got a quote for 130 for diagnostic fee for under load turbo. Eventually a nasty mix of coolant and oil started leaking out of my downpipe because the gasket between the dp and catback had seperated in two. It usually hits like quarter of a way when I floor it. It's called a Boost Leak Test, and it's the only definitive test for finding boost leaks. Have to go get pvc cap and coupler from Home Depot. Can't be more difficult than that right? You should be fine if you did shift cables and water pump. He says the ST is running great but his tuner sees this in his data. The stock clamps are hit or miss, sometimes they work forever sometimes they let go. Search "focus st boost leak"@Jack-pj6wk Apr 13, 2023 · I plan to do a boost leak test when I get off work today. Has any members had this problem and if so where did you find the leak? Again I do not have the leak it is on another ST. Smoke tester https://amzn. May 22, 2022 · Problems with my 2010 ford focus st 225 2010 Cracked liner? bad spark plugs? turbo seals? map issues? oil breather issue? I need Your help Tags cracked liner oil housing issues posstive crank pressure Jump to Latest 3K views 2 replies 3 participants last post by MtnMan May 22, 2022 yorkshireGIANT Discussion starter 1 post · Joined 2022 #1 ·May 22, 2022 (Edited) Jan 6, 2021 · Boost leak ? boost leak focus st tuned Jump to Latest 4. Check That It Opens And Closes Easily Make sure the wastegate isn't stuck in either the open or closed position. I can't see the the connections to Aug 24, 2015 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. cheers Jul 13, 2020 · Hey guys I was wondering if any of you could help me out here. There's of course a change that your fault is something easy like boost solenoid or even a boost leak. I've made sure I'm in the correct Mar 10, 2015 · i have a 2009 focus st225 and seem to have a boost leak from somewhere when i get to about 3 1/2 revs it starts to loose boost. Dec 9, 2024 · Idle boost pressure is normal, holds and builds boost pressure normally as well no issues. any ideas on where too start looking. The one stop shade tree ST shop. If you don’t find anything obvious, I’d do a boost leak test before going the new/used turbo route. I'd suggest a boost leak test and visual inspection of the turbocharger and its wastegate. It’s got 50k miles it’s pretty new but it has a boost leak that doesn’t wanna go away. You’ve upgraded the intercooler, so you’re cooling the air charge more, increasing the density, thus reducing the pressure. Look at your exhaust; if there is a whitish look to it you are leaking from a water passage into a combustion chamber or have a cracked turbo leaking coolant into the induction charge or exhaust. Mar 22, 2021 · Pretty sure this is a boost leak, but I wanted to be sure. I own a 2018 Focus ST i bought brand new and now it has 43K miles on it stock turbo and I'm FBO no E30 no W/MI. I only had this issue with the new turbo and BOV, which I installed both at the same time. Is it safe to say I have a boost leak somewhere? If so what do I check? Apr 8, 2016 · Other common causes for boost leaks are the symposer, and the map sensor on the fmic. So I reflashed my tune and wgdc is back at 100% but I’m still only getting around 16lbs. so think if i remove it no chance of ever lossing boost from there ? Nov 1, 2013 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Jun 8, 2023 · First upload regarding one of my own cars the ford focus st 225. For some reason it doesn't do it in second but happens 19+psi in third Jul 24, 2013 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. 6. Mar 24, 2019 · AFR, lambda etc. Pressurize the boost leak tester with an air compressor and a tire inflation tool. Car is 100% stock minus wheels and tires. However, the slow spool indicates to me either A) a leaky wastegate or faulty actuator, or B) a failing turbo. I was also wondering about my map tap/true vaccuum setup. 5. Nov 6, 2012 · I've been searching about, and still haven't been satisfied. some 1 told me that some times u can get a boost leak fron there is the diafram has gone. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Jul 17, 2021 · My immediate thought is a sticking or leaking bypass valve, since you mention cycling the throttle and achieving more boost. I notice on a few pulls my BOV (turbosmart 50/50) is getting stuck open and I believe this is where I'm losing boost. Learn More! Jan 31, 2024 · First thing I would be doing is checking for a boost leak - check all the hoses are attached and one hasn't popped off and look for any visible cracks and holes. First of all, turbo seals may let some Jul 7, 2025 · I have a 2013 focus st and over the weekend, I noticed I have a pretty significant boost leak, I normally boost at 21-22 psi and right now, I’m only boosting at 15-16 psi. Boost goes up past 20 psi but doesn’t seem to match the out put. to/3BXctR6 (AMAZON) 2:30 picking out open g Jul 20, 2020 · Need Help! Low Boost No Boost Leaks So I bought my 2016 focus ST brand new and I have now put 65k miles on it. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Jan 14, 2025 · A boost test revealed no audible leaks but didn’t move the accessport reading past 1psi, probably the 50/50 bov venting internally. We get this question a lot. Check for leaks before throwing parts at it. We have a slight boost problem as many people do this is my intro to sorting this money pit Oct 28, 2012 · It also states on the webpage above: The standard Ford valve has a diaphragm design that can collapse and cause boost leaks in conjunction with a spring only rated for standard boost pressure, once you have re-mapped your ST/RS the boost pressure is increased and this can cause the above faults. I don't think there's enough vacuum holding the piston closed. Since our turbos are buried is there a better spot to attach to? If I attach to the intake pipe would there be any issue? Nov 26, 2022 · Been noticing a coolant leak from the underside of the car. My wife’s ST had similar symptoms to what you’re reporting and it was owing to the boost solenoid. Does the car feel slower than normal? have you owned it where it didnt do this May 22, 2023 · If the P0299 engine code appears in your Ford Focus ST, you can perform the following measures: Look for Boost Leaks by Examining the Intercooler and Intercooler Pipes, as well as the Exhaust System. I smoked out the air side just to see if I’m losing Aug 29, 2021 · 2017 with ~25k miles and I was getting on the freeway when it felt like the engine power was cutting in and out. 5 to 5 psi I checked the intercooler piping I checked the bov. They both noticed my wgdc was at 0 at first. Are my turbo seals blown? So for you guys that are unfamiliar with turbo seals and how they work, here is a little info. Initially I am thinking boost Jan 28, 2019 · Hi guys. am i supposed to block the bov or something??? Nov 6, 2022 · Could anyone please help me what causes the problem with my turbo boosting, it all started with a long trip and after 4 hours of driving my car completely lost all the boost no engine codes nothing just couple days ago code came up that no boost pressure detected Also now the boost gauge on Dec 3, 2014 · So we have been getting this question a lot from guys with both stock turbo and upgraded turbo. Upping your boost with a tune may have pushed one over the edge. If you have a look on YouTube there are a few videos showing the kind of behaviour you might see, although for us it was intermittent and fairly erratic! Dec 4, 2018 · This can cause a small coolant leak, which can go unnoticed for a while. If the boost was getting into the engine internals I think that there would be a leak from the camshaft seals before the block unless there was something Dec 3, 2023 · How the hell do i run a boost test. It's these two hoses with a green line going through the firewall. Just got under my car today to do an oil change and guess what Mar 21, 2019 · Hi chaps As some of you know I've been fighting to get my ST healthy pretty much since I bought it. I think I have a boost leak somewhere as I hear a light whistling sound under 3k rpm. 9K views 13 replies 6 participants last post by jamie1073 Oct 12, 2018 S Mar 8, 2015 · Since this ST is MAP based, it runs fine with a boost leak. Feb 23, 2025 · Explore common Ford Focus ST engine problems, their symptoms, and potential consequences to ensure your vehicle's reliability. Sound is from in cabin, at full throttle, hitting 19 psi but tuned to hit 22 psi. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! The max i get is about 12psiWell since your car is stock, i gotta ask do you have a warranty? You could ask ford to check it out. Is it correct? I’m running a BNR st67 tuned by JST. That’s a good thing. The Jul 12, 2013 · Okay so I figured out I have a boost leak somewhere. Jul 8, 2016 · Cam Shaft Sensor codes causing hesitation and weird boost spikes Apr 19, 2023 · I have replaced the transmission input shaft seal twice now, and it continues to leak oil out of the bell housing vent hole. Jul 30, 2025 · Just put in new shifter cables and changed the water pump. Well today I noticed that not only does it idle high but also it can't hold boost. If only I got paid to do this, lol. Our cars generate boost that is required to meet torque specs so if its cold, you will get less boost but still have the same torque. So I took it to ford and they said they Feb 25, 2022 · +1 with what @5dmc1 and Deuce said. I have checked the bov, and all connections look secure. When it was a modded ST, it didn't run with a blown off hose and needed a tow truck. Aug 13, 2020 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. this doesn't do it Apr 26, 2015 · I had boost issues with mine recently and spent ages trying various things like changing springs in my recirc, uprating boost solenoid, installing a mechanical boost gauge, changing map sensor, doing a leak test and eventually gave in and took it up the Hull and both guys (seperately) at DS sniffed out that my recirc was seizing straight away Jun 1, 2014 · Looking at a log to determine a minor boost leak is difficult because the turbo will just work harder to achieve its target boost. I pulled off belly pan and checked connections and all seem secure. A clean BOV or BPV is designed to provide you with years of reliable service, providing a simple maintenance schedule is easy. The build you all know and love, lol. . FBO with gtx3076r g2, WMI for extra fueling. Got out of the throttle and it smoothed out, but immediatly got a CEL. I have seen on some other threads that I can take off the top and reseal it which I will try before buying a new housing. I also have a boost issue where my Jan 23, 2020 · We’re the premiere Ford Focus ST forum with discussions on the 2013+ Focus ST. It is mapped so hits full. Only way to really know whats up. Please check out the video Nov 30, 2020 · Theres the specific test for boost leaks. Recently fitted a new boost solenoid and my son fitted it the way it was already fitted with the plug pins facing forwards and the actuator hoses going to the nipple that 'Tees off the side' but Aug 14, 2013 · Ive been noticing white exhaust smoke coming from my car at idle. 6lbs. It needs to be revved until the oil pressure reaches normal running pressure that will be around 2-2500 RPM - check yourself as to the lowest revs when the oil pressure reaches max. Then check the boost solenoid and wiring. If you have that major of a boost leak as you hold your foot down it should decend even more to the point you might not make boost. Feb 10, 2018 · Boost leaks could be one of the pipes or the symposer unit if its still in place, or it could be the recirc valve leaking or even the actuator spring being seized. Jul 26, 2025 · Have you cleaned and lubed your BOV? It should be done every 6 months or so. While it takes a bit of time to make a boost leak tester, it's less time than you'd spend searching for a leak. it sounds as if the intake suction noise has moved from the filter side to the turbo side when getting into boost. all fine. Dec 10, 2022 · Look No Further!Turbo Boost Leak Testers, Inc is dedicated to making boost leak testers – That’s it! How do I know if I have a Boost Leak??. I sent a log to my tuner and a friend. Any help appreciated. Car seems sluggish. to/3BU5WGW (AMAZON) smoke fluid https://amzn. I replace the Welcome back to another video!So for a little while now I have had some sort of boost issue and I was told it was the boost solenoid. Everything on the car is stock except for a Cobb air Jan 13, 2020 · Hi everyone, I have noticed that my oil filter housing is leaking oil from the front of the square plastic part on the top of the housing. I would start by going through the pressure side boost pipes and hoses. The heater supply and/or return coolant hoses can leak at the junction where they pass through the firewall - there are special connection fittings here and they are very close together and almost impossible to remove without a special tool. Apr 11, 2016 · I think I already know the answer to this but I just installed cp-e FMIC, hot side and cold side charge pipes w Tial BOV. Just put t-clamps on charge pipes not sure if stock clamps Aug 6, 2014 · Check your oil; if it is milky looking you have a head gasket leak between an oil passage and water passage. 3K views 17 replies 7 participants last post by Duece McCracken Jan 8, 2021 Thatblack_St Discussion starter Apr 21, 2023 · That sounds like a boost leak to me, you can make a tester or buy one online. Car was driving fine, so babied it the short Aug 27, 2025 · Hey guys, I realize a boost leak is probably hard to diagnose if you can’t see the car in person, but I’d still love peoples two-sense! Running about 4 psi :/. 2, Clean your MAF sensor and your MAP sensor- known to cause some issues. Join the community and see the latest news, photos, videos, classifieds, reviews, events and more! Oct 5, 2020 · All of my charge pipes and clamps are brand new. What you really need to care about is air density. Jun 1, 2016 · Hi im new to the st scene and new to this club so hi! I have a boost problemim only getting 1/4 boost on my guage in all gears even with foot to the floorive replaced the boost solinoid still the samechecked for leaks etc on boost side and bac side all ok! I have noticed when i pull Sep 17, 2021 · Hey guys so idk if I’m just paranoid an it’s nothing to worry about but when I go WOT I noticed that my boost pressure would climb up to its normal 16-19psi an it will slowly drop while I have it WOT is that normal or do I have a boost leak I plan on doing a boost leak test just have to do May 20, 2022 · If the valve leaks under higher boost pressures it can pressurize the crankcase and obstructe the rotating mass as well as force oil past seals. One says LH, the other says RH and the leak is coming from the Oct 13, 2024 · Hi guys new st-3 owner here . Apr 5, 2022 · How many miles on you 15. While, I've only had May 1, 2023 · Hello ST community! I am new here I recently bought a 2016 FoST. ALmost like boost was fluttering (best way I can describe it). Aug 26, 2019 · So replacing a fog light bulb I discovered that there is a drop of oil on the oil filter cap. If you remove the hose completely from the top of the BOV, it will leak from the BOV too. I have had it laid in m Apr 10, 2024 · I'm wondering where the MK2 Focus ST225/XR5 Turbo commonly leaks oil from? My car seems to be leaking towards the rear of the engine There are puddles of oil in the middle and right side of the car, and checking the dipstick reveals the oil to be halfway on the dipstick, so I'm not going to Nov 2, 2013 · Mañana a bud and myself will be checking his ST for boost leak. Doesn't seem to be an issue with throttle applied but cant really tell. A boost leak test is in order. 7K views 13 replies 6 participants last post by junits15 Apr 28, 2021 Xemist Discussion starter May 25, 2015 · Hi guys, I think I may have a boost leak, I hit full boost a few times and it keeps dropping off to a quarter on a steady throttle . When ever I try to build up pressure it’s like the car starts to stutter and the check engine light just starts flashing and then when I stop trying to build up pressure it just goes away. Took my ST to the dealership and they diagnosed it at the rear main seal and it was repaired under warranty. Loaded my initial tune from tune plus and the car will only boost to 9. Wrapped up later than I'd hoped last night and got in the car today and she runs fine except that I can't get more than 13 lbs of boost. Suspect a leak? Well, then you test for it. Jun 23, 2017 · So about this time last year I was doing an oil change and noticed oil hanging from the bottom of the transmission housing. vd8y9 gaknia muoohm kirmomx1 zv qd odbb aey zspjq5oc lap
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