2003 VOLVO S40

Sounds like you have a leaking head gasket.

If diesel, it could be dodgy glow plug(s). Had a similar problem with my s40 and new glow plugs solved it!

check your mafs it is located on the air duck clean it with a mafs cleaner you may have humitity

If your airflow sensor (meter) is faulty then nothing in the fuel system will work as it should. This sensor tells the computer how much air is entering the engine so it can determine the fuel needed. It sets the amount of fuel by adjusting the length of time fuel is injected. So obviously your problem.

what color is the smoke if blue it is oil, if black or grey its fuel ,didyou have theinjectors seviced? if it is oil take it back to who ever rebuilt it

it sounds like you have a injector leaking down into one of your cylinders so it is flooding out a cylinder thus runs rough and long cranks.

Volvo 2000 S40. Fantom starting problem. Went to the starter and has no power to soliniod. Will start for weeks then nothing.
Is this a module

Volvo is a good car. if you maintain you volvo by changing the oil on time, maybe after every month according to how you drive and changing you fuel filter, using 93 grade fuel or 89. I advice you to keep your volve. do your oil change on time don't wait until three to five months before changing your oil and don't use poor fuel (87) grade. change your tranmission oil after 18 months then your volvo is yours for life.

you probably have air on the lines or the brake booster is bad.
try purging out the lines first and see if that helps

found waste gate on turbo sticking freed up ok now