Fixed! I didn't expect this to be the problem! Smart Fortwo boost issue. 

3:19 the all knowing laugh of miss HubNut 😂😂😂😂

Miss hubnut is fighting an uphill battle. The natural state of a garage is to be an absolute tip.

Miss HubNut's eye roll at about 1.09 is a picture (that paints a thousand words).

Sometimes you win through sheer persistence. The warm glow of success is always much better when it finally happens. Well done.

I love Ian and Carly's dynamic - it's so sweet!!!!

The engine sound with the cover off was outstanding!

I am glad you found those broken vacuum lines and the car is running nicely. Please give Miss Hub Nut a pat on the back for me for her wonderful work in the Big Tidy!

Lesson 1 - always check hoses before suspecting a parts failure. Lesson 2 - get some cheap storage boxes, label them and start grouping parts - even just basics like "clips", "hoses", etc.. That could be a video of just discovering 'lost' parts, sorting, chatting and clearing out 😀

You do remind me of my brother. He buys everything at least three times as he has lost every item he has ever bought by putting it somewhere 😊😅. P.S. I see Classics World has an upgrade page for Smart Fortwo in this months edition 👍

Carly A++ for efforts in getting that place straight keep going the end is in sight ,by which I mean you can now see the floor !..

1:09 that look 😅

What's kinda funny is that the Smart turbo engine starts to sound like the 3 venturi carb on a Saab two stroke when the torque curve builds, it's mostly intake roar but with that 3 cylinder beat.

Looking forward to seeing the PJ home and in use. Miss HubNut's paper template/model technique is a favourite because it works so well! Love the smile on your face as you realised that it was working! :)

Well done Ian. Cars these days seem to have more hoses than a garden centre and any one of them can cause poorly running. It's great to see the Smart, I think she needs a name now if she doesn't have one already up and running better. Beware though I think TWC and Elle might be slightly jealous as there play time on the road may be diluted with another car to share it with.

Absolutely brilliant video Ian miss hubnut ❤👍well done for cleaning up well done for fixing the smart Ian brilliant

I feel that smile at 10.15 says it all, this is a fun car to drive

At 6:01 I thought you dropped the F bomb, until I realised you said vacuum.

The magic of three cylinders. Now with boost! Good job, Ian. And good job, Carly! Alone in the spare parts unit doing some tidying... 💥👍💥

sounds like you're on the mend now Ian, just like the engine. win-win 👍

The engine in this sounds surprisingly good! And awesome fix as well! These sorts of fixes are always so darn satisfying. :D

I have a Smart 451, and I recognise the Smart car smile on your face! They are just such fun cars to drive.

One of the first things i would say i don't know much about Smart car's but when it come's to Turbos especially the one's that are vaccume operating is to test all your vaccume pipes you can buy a simple vaccume pump used often for bleeding brakes for around £25. I made a video about it on the vw Passat Tdi how i could remove the turbo by simply removing a vaccume pipe. If i was you i would replace as many of them as possible they tend to break down inside and start to leak after time glad to see it up running. 👍

Enjoyed that one, proper Hubnuttery!

well it's now sounding more like a smart little 3 pot engine should sound! I found them quite fun to drive, althoug not very engaging, if that combination is possible. I think it suits Mrs Hubnut very well for quite a year around ride, despite the cloth roof. When the sun pokes for some seconds in the sky, it's just a touch of a button to open the cabin up. I guess this is the only series of videos of smart maintenance I've came across on youtube and it's very detailed and useful. thank you both for the joyfulness you two have to be in the rain and cold to make these videos for us!

Glad you got the Smart fixed. Miss Hubnut is doing sterling work in the unit.

Wastegate actuator has a spring & diaphragm which boost acts upon. You could feel the spring on the actuator when you moved the arm. The actuator is piped to the turbo side of the boost pipework which will give you your base boost control. The cycle/boost control/amal valve introduces a leak into that hose which is ECU controlled. This has the effect of bleeding a portion of the boost pressure that the actuator "sees" thus allowing a higher boost level to be run. A leak in that pipework has the same effect but the ECU gets into a strop when the boost goes above the commanded level. I had a roadster which happily chattered but that would have run more boost being the 80bhp version. I'd make sure it's piped up correctly.

Wow - Getting that bumper off is so much easier than on a 451! On them, it's the tailgate, sill covers and then rear bumper!

The smile on your face at the 3 pot roar says it all…. Love my 3 pot turbo Suzuki Swift auto, love it’s roar on kick down

When you keep going back to 6mins and thinking you hear a swear word escape from hubsters mouth 😂

Some generic remarks on these older turbo systems: * the WG valve itself should move very easy while unconnected to the rod. (It did, you showed it moving) * the rod only needs a little bit of spring preload when connected to the WG. The more preload, the faster the boost will rise and if will possibly boost spike a little. ( no need to mess with it if you are not tuning the car) * the cannister attached to the WG-rod has a membrane and a spring in it and that membrane is not allowed to leak. (If it does the boost can't be controlled and will spike on on every big throttle input) * the hose connected to the WG actuator cannister (that you fixed😅) is the boost signal line. It also shouldn't leak because it is used to push open the WG valve. * lastly there is the boost solenoid valve. It is fitted in that boost signal line and between the WG actuator and the intake manifold. My quickly cycling that boost solenoid on-off-on-off-etc the engine management computer is able to control that boost signal going to the WG-actuator, thereby controlling peak boost. Easy peazy, lemon squeezy. Isn't it? 🫠🙃😉

Congratulations on the fix!

With the cleanup taking at that speed until 2078, lots of jolly clips for us viewers to come

Ah Ian you poor naïve fool! Fancy thinking you were deciding what goes where in the unit. Despite you trying to fill the unit back up as fast as Carly empties it she is doing a fantastic job. Looking forward to road trip smart content.

Good work that man! ...and the little grin under acceleration coming out of that bend at the end was telling.

Your making lots of progress tidying 👍👍great you have successfully fixed the problem 👍

Love the wee smile Mr HubNut near the end as your engine revs go higher 😊

Hehe - the test drive with no engine cover made the Smart sound like a rally car 😁 - Great that it is (seemingly) working properly at last. 👌

You've become addicted to the overboost, but it's a good thing you replaced the leaking hoses.

Nice job 👍😀 At least the cycle valve is a spare part for a car you still own 😉

👍👍👍💪💪lovely sounding engine .

Quality tinkering episode Hubnut!

Hurrah ! Finally succes! 😉! Time for cleaning and rustproofing the smart! And the pajero and…. Treasure hunting in the barn! So much to do in so little time! Must be HubNut!😜 🫶u guys! 👍🏻👍🏻🆙

Not quite the sound of the Mazda 787B rotary but still managed to make you and me smile on yur test drive.....

Excellent levels of persistence Sir.

Nicely done!

I can see who is doing all the tidying work!

Excellent.. just a hose , first guess 😊 A dump valve may give you the noise your after , Ian easy fit 😁

Congratulations! ..and man I do enjoy a three cylinder engine note. Looking at you driving it, it seems like a fun little thing.

Judging by the grin during the test drive i thought the engine cover might be staying off😂.

You said it was not as boosty after the fix so it was deffo over boostying. Im happy for you and I'd leave the engine cover off. That smile on the test skive run 😂

I mentioned these hoses when you first got her. Best replaced with silicone hose with either a 3mm or 4mm ID (I forget now). They're a lot more forgiving in a hot engine bay.

glad youve found the issue ian!

Do you remember when mechanic wouldn’t work on original Mini’s as they thought they were too complicated? Wow. It hurts my brain watching you work on that Smart? Car. Give me a Mini any day. I also drive a Ford Falcon and a Holden Commodore. Keep up the good work.

Well done. Great news🎉🎉

It occurred to me that you'd leave the cover off just to enjoy the sounds! 😀

Great little tinkering Video Ian.

Good job Ian another great video has always Ian and Carly miss/mrs hubnut and hublets and hubmutt 👍

Nicely done. In true Hubnut fashion. 😉👍

So glad you fixed it. You could get a dump valve to make it sneeze or ptchoo!

Nice 😊

Your making lots of progress tidying 👍👍

So many problems caused through hoses and wires touching hot surfaces in cars,but so glad you seem to have solved the problem,a day out in smartin must be on the cards ( sorry it's just a temp name I've come up with ) 😊

I love the sound of those little 3 cylinder Engines

Holes in hoses would've altered the pressure which the wastegat was opening. So potential overboost which threw it into limp mode. Hence the extra flutter and peppiness before it was sorted. Glad it goes well again.

And in the next clearing of the unit he’s gonna find that valve and wonders what that is, ‘could it be of a smart maybe…’🤔

Steady, you will lose the ability to justify a new tool when you've misplaced an old tool. My wife is always offering to help me clear out my garage. I decline politely as she is way too aggressive in the 'bin it' attitude. I once took my garage keys with me when I went on a business trip to stop her 'organising it' whilst I was away!! Sadly these days I struggle to find most things in the garage but that's mostly because I can remember where I put things two house moves ago. doh. Also I love the smug grin that comes on Ian's face at 10:14 when he unleashes the 3 pot turbo growl san engine cover :-)

Yay you fixed her!

Good wholesome Hubnut fun

Nice that it was an easy fix (I mentioned vacuum hoses the first time) it could have been a broken brake servo which would have taken ages to fault find.

Hi Ian, You may try silicone tape, very stretchy and keeps under high pressure. look into it! 😀

Use the spare cycle valve, a T piece and a switch to make a manually selectable Ptchoo Valve.

10:15 ➡️🙂⬅️ Nice progress and detective work Ian. 👋👋

I'm glad you got the smart sorted. We had a 450 like yours and now have the 451. I prefer the engine in yours as it has a sump plug just be aware that there are 6 spark plugs on yours and the rear 3 are a pain to get too

A very cheap fix on the Smart car and fingers crossed it is fixed properly also Miss Hubnut is extremely organised when the tidy up is finished and the Mitsubishi Pajero Junior is in its place in the shed l hope you keep it tidy

Bring back the ptschoo - jam (I mean 'adjust') the wastegate a bit? My brother had a Fiat Punto TD70 many years ago and welded the wastegate shut. Apart from sounding like a Transit van (lots of interior space, diesel engine and not much sound proofing - so just like a Transit van), it was a bit mad - until it blew up, anyway. Good fun.

I like the action of the automated manual. Reminds me of the Leyland Hydracyclic that the Tigers I grew up with had for their first year before being converted to manual change.

I remember when my A3 TDI turned into an SDI. It had lost tonnes of power and the revs barely dropped when changing gear. A vacuum hose that ran from the Vacuum reservoir to the actuator arm had split. Once i replaced the hose it turned back into a TDI again

@4:52 I thought this was a family channel!

Carly's knowing laugh... " the rear bumper should come off, quite easily.."

Reminds me of what a carburetor with a massive vacuum leak does for the way a car runs, or Doesn't as the case may be....Cheers

The idea of making paper cutouts to work out car positions is brilliant. But I have one caution from a lifetime's battle with my untidiness and disorganisation: if you do work out a really good arrangement, you need to check that it is NOT uniquely good. That is, every piece, ideally, has at least two positions to go into. Else, if you need to move one thing, you have to move all the things. We all enjoy watching an episode of car shuffling, and I guess you're pretty close to move one, move them all, now; but if you're going for an optimal solution, room to move is a good thing. There are alternative ways of coping, but they involve totally unrealistic goals like a larger unit (stuff expands into the space available), fewer cars, or (most ludicrous idea of all) throwing stuff away on a regular basis.

Most of the fittings on my front bumper are gone, so with the holes that were in place in the first place I refitted the bumper with zip-ties 😂

Yeah, I was a bit envious of your perchoo in previous videos as mine doesn't do that so in solving it you've lost that lovely noise 😥

By jove I think we got it!. Here was I thinking my garage was bad and full of stuff and one look at Ian's lockup ;)

AY UP MR AND MRS HUBNUT

Ian, you were looking at the switching valve, the cycle valve is probably mounted on the TIK pipe (turbo intake) out of sight. Follow the hoses

Nice one 👍 Well done. Love how organised Miss HubNut is. I hope she will keep you under close supervision once all is in its place. Lol

This is the first time I've seen a beer keg used as a door stop.

The smile as he finally understands how stiff it should be.

That engine sounds good! Better than the three pot in my Acty

So the idea now is to what exactly? Chop it up amd turn it into a Smart-Kart!? I think that's a brilliant idea!

Re. Storage boxes - I'd recommend the Really Useful Boxes- they seem to be very durable and watertight which may be useful in your unit's slightly damp environment.

In one comment, you mentioned that you miss the over boost feel. Reminds me of my sister's MG. I did a tune up on it and filled the oil reservoir in the carbs. The oil keeps the slides from snapping open as quickly. Apparently the car didn't accelerate as quickly with the oil in there. She was rather grumpy that I fixed it. She liked the extra snap. I guess you can't have every thing.

Carly is doing a grand job. However I think we are all to blame especially when you had the Hubnut mail our where random items were sent in (mainly from wish)

Man needs some boxes labelled for spare parts of different cars, saves rummaging and buying duplicate parts 🤗 Have you got a Haynes book of lies for the smart? It would be better than nothing 😊👍🇮🇪

It's always so much easier to tidy someone else's space, I'm trying to tidy 10 years worth of stuff in my workshop. I seem to get sidetracked at every turn, the ability to just put stuff out in the workshop to get it out of the house is the main issue.

6:15 relatable

That green truck beside your unit looks interesting

Have you thought about getting a big skip for the stuff in the garage. You could put the Berlingo in it at the same time.

Wife looks and sounds happy 😂