Leyendo un poco acerca del 2002 sugieren que hay un método para arrancar en frio. por lo poco que entendí, creo que se trata de avanzar la palanca toda avante (full throttle). tirar del cable del paro del motor, para después atrasar la palanca de gases a 1/4 , todo esto con la palanca del acelerador (sin marcha). Echale un vistazo al manual a ver si hablan de eso, o es un simple truco para arrancarlo.
De todas maneras todavía tienes que mirar por que no desaceleraba, solo se me ocurre el cable de mando.
Edito:
Efectivamente en el manual dice, esta en ingles
VOLVO 2002 DIESEL
1. GENERAL OPERATING PROCEDURES
1.1.
Cold Start and Stop Procedure
1.1.1. Turn “Instruments” and other electronics off before starting engine
(or they may fault)
1.1.2. Turn battery selector switch to the starting battery, usually #1. The
engine can be started with battery selector switch in “BOTH” or #2 if
needed.
1.1.3. NOTE: SEQUENCE IS IMPORTANT: Advance throttle 75% with
red button engaged (throttle only, no transmission engagement).
Then pull stop handle out and push back in to set governor in extra
fuel position. Extra fuel is not needed if engine is warm.
1.1.3.1.Insert key and turn ignition on (fan will start). Start engine
and maintain speed at 1,500 RPM. Let the engine warm for
5-10 minutes before attempting to move boat.
1.1.3.2.When the engine is running, both batteries are charged
regardless of the position of the selector switch.
1.1.3.3.Switch to #2 (deep-cycle) after engine is started so that if
battery accidentally discharged, the engine can still be started.
1.2. Don't "baby" the engine, continuous operation at 3,000 RPM is fine
although typical operation is 2,300-2,700 RPM. Back-off the RPM if it
begins to smoke.
1.3. If engine has been worked hard for more than an hour, let the engine idle
for a few minutes to eliminate any differential cooling after stopping.
Pues viene a decir eso, avanzar los gases a un 75%, tirar de la parada del motor, retrasar gases lo justo para enriquecer la mezcla para el arranque una vez en caliente no será necesario, dice de dejar el motor una vez arrancado en 1500 RPM. y dejarlo calentar unos 5 a 10 minutos.
Una cosa en la que inciden mucho no solo Volvo, es que no "mimes" el motor , en operación continua unas 3000 rpms, van bien aunque lo típico son de 2300 a 2700 rpms, retrasa los gases si empieza a humear el escape.