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Help motor goes off for 30 minutes and on again after

2703 Views 12 Replies 8 Participants Last post by  Igor Barbaros
i own a 2001 smart 4two cdi/diesel.

My car stoped after few minutes driving at a red sign and only started after 30 minutes. And i've been on that cicle for a month allready.
During that time the electrical part its working and when i turn the key everything's fine but the motor doesn't give any sign.

Now their saying that i have to change all the transmission. It's expensive and i have my doubts cause i dont have any problems in trasmission and it doesn't seem to be the problem.

Please help,
i'm desperate and the transmision money it's almost the comercial price of the car

Paulo Inacio
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It doesn't sound like a fuel problem. It sounds like something electrical. I would guess the MAP sensor is sending a wonky signal as the engine warms up.
The MAP sensor is "Manifold Absolute Pressure." It measures the manifold air pressure and sends the signal back to the ECU (Engine Control Unit). The data provides the air flow rate which is used to calculate the amount of fuel that is fed to the fuel injectors to provide the correct ratio between air and fuel for optimum combustion.

Here's a good explanation of the function:

In Smart 451s the part number is 451-820-69-10 (please double check me on that) and is located at the front of the engine below the exhaust manifold.
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Yes, it can.

It could also be a failing fuel pump, something failing in the ECU or SAM.
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