Warning Fuel injectors are connected to fuel pipes. Fuel can set you on fire and make your day miserable. No smoking, lighting farts or juggling flaming batons whilst you are doing this. It is important that you do NOT have the keys in the car. If the ignition gets...
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Roadster Fuel Injector Removal
Warning Fuel injectors are connected to fuel pipes. Fuel can set you on fire and make your day miserable. No smoking, lighting farts or juggling flaming batons whilst you are doing this. It is important that you do NOT have the keys in the car. If the ignition gets...
Turbo Removal Roadster
Before you start, spray all the fixings with a penetrating oil. The more you repeat it and the longer you leave it, the better. Remove the rear panels, the exhaust, the lambda sensor in the exhaust, lower IC pipe and the TIK pipe. Remove the small E10 bolt from just...
Turbo Removal 450 Fortwo 700cc
Before you start, spray all the fixings with a penetrating oil. The more you repeat it and the longer you leave it, the better. Remove the rear panels, the exhaust, the lambda sensor in the exhaust, lower IC pipe and the TIK pipe. Remove the small E10 bolt from just...
Roadster Lambda Sensors
The Lambda (O2) sensor is by far the most common fault that brings up the engine fault light.
MHD Belt Change
Jack the car up and remove the wheel to access the belt cover. Each end of the belt cover is a plastic plug. They are nice and easy to lever out... ...which releases the clips on the other side. With both plugs pulled down, the cover can be pulled from the car. You'll...
Roadster Exhaust Fitting
Remove the rear panels, this can be found here. Remove the crash bar using a Torx 45 screwdriver. There are 2 nuts holding the exhaust to the turbo. These can be removed with a 13mm or 1/2" socket. It is a wise idea to spray these with penetrating oil over the...
Forfour Auto Gear Fault
No Gears The fault affects the semi auto version of the 454 Forfour This fault is becoming more and more wide spread. Not being a Forfour owner myself, I had no dealings with it but the fault is very similar to a fault on the 451. Ozzy site reader Chris had issues...
451 CDI 54bhp Sensors
54bhp CDI - The Over-Engineered Pain In The Arse The 45bhp CDI engine was reliable and efficient, however, due to the Euro 5 emissions standards coming into force, smart had to make changes. They added a DPF (Diesel Particulate Filter) which removes the particulates...
Lowering The Engine – 451
This page covers tipping the engine to gain access to the pulleys and full lowering of the engine. Tipping The Engine As with other smarts, the access to the pulleys is restricted but tipping the 451 engine is a bit more tricky. Place a jack under the gearbox and...
Lowering The Engine – Roadster
The engine bay is quite restrictive so lowering the engine a bit can help a lot.
Top Breather Pipe Repair
If your top breather has failed and you are having problems changing it, repair it instead.
451 Air Box Removal
Want to remove the air box to make something more interesting?
450 fortwo Belt Change
This page covers the AC belt and alternator/water pump belt. Air Conditioning Belt Look at the right hand side of the engine. It's not easy to see. Find the tensioner pulley wheel. Use a Torx45 bit to loosen the screw arrowed in the photo below. Push the pulley wheel...
Seized Alternator
On the 450 fortwo and the Roadster, due to the open design and the placement of the alternator, if you drove your car in wet conditions and then left the car standing for a few weeks, there is a chance it won't start. This is because water gets in and creates rust and...
Gearbox Removal
Why remove the gearbox? Maybe you want to change the clutch, maybe your gearbox is fucked.
Intercooler Fan Removal
The intercooler fan is visible over on the left side of the engine bay. Removal is fairly easy. Disconnect the electrical connector from the intercooler fan. Disconnect the throttle body electrical connection and then remove the 4x Torx E10 bolts. Undo the pipe clamps...
Intercooler Radiator Removal
Remove the intercooler fan to gain access to the intercooler radiator. As you have already removed the upper intercooler pipe, you just have to remove the lower intercooler pipe. This runs from the right hand port of the intercooler radiator to the turbo. Just loosen...
Intercooler Scoop Removal
It's common to have a part of the lower intercooler scoop missing as they often get smashed off by stuff in the road like dead foxes and giraffes etc. The scoop is 2 parts so you can just replace the broken section if you want.
450 Fortwo Clutch Removal
The clutch doesn't last forever. It wears down causing slipping and poor pull away.