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Discussion Starter · #1 ·
So my brother's 94' 7.3 is intermitedly smoking white.

When it's running good the check engine light is on. But then the light will turn off and the engine starts to blow white smoke.

He says when the truck is started it idles low at about 500 rpm, runs rough and does not want to rev up. After awile it will slowly rev to 1500 rpm and stay there. If you try to rev it then there will be a 1 or 2 second delay before rpms rise then it will will return to a 1500 rpm idle.

He has changed out the pcm and crank censor, but hasn't had any luck.

Any ideas?
 

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Sometimes when PSDs blow white smoke when running it's because gasoline was put into the fuel tanks instead of diesel (probably not the problem here, but I thought I'd mention it). Almost sounds like this one has an injector problem (injector internals or maybe nozzle copper gasket). Knowing what code is being thrown to cause the CEL would be good to know too. Cheers!
 
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