Hi all this is an update on a older post. My 99 f450 7.3 runs bad on first start of day. I checked the codes 3 codes p0475, p0470 and p1247. Now here is what I tried I plugged it in over night and it will start and run as should the next morning with out side temp 47. Drove the truck late yesterday evening didn't plug up tried it this morning with a outside temp of 47 truck starts but missing and like of power. My problem seems to be temp related. Will low boost pressure cause this problem what do you think I need to do ? Thanks for any help you can give.

 

How soon (after starting) does it reach 'full power'? You will only see boost at higher RPMs - is that where your power loss is?

I would test all your glow plugs, for starters. You can do this from the harness on top of the engine.

 

Thanks for the reply It starts up pretty quick as for reaching full power if you drive it will only get up too about 40 mph until the engine temp gets up to about normal then it runs as should. As for boost I don't have a gauge I'm going by the code it set p0475, p0470 and p1247 They are low boost are they not?
Another thing I don't understand I can clear the p1247 but not the p0475 or p0470 can you tell me why?

 

You might ask in the 7.3 forum.

 

Thanks I will.