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Exhaust Smoke

I have a 94 F-350 with a 7.3 IDI. When I drive it for more than an hour or so, It starts spiting gray smoke when I let off of the accelerator. Does anyone know what's going on?
 

blacksnapon

Moderator
Staff member
I have a 94 F-350 with a 7.3 IDI. When I drive it for more than an hour or so, It starts spiting gray smoke when I let off of the accelerator. Does anyone know what's going on?
Might have some valve seals leaking.
 

Fellro

Moderator
Staff member
It is also possible the CDR valve needs to be cleaned.
 

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