BEAR_METAL
Registered User
So I bought a 93.5 F250 with a 7.3 turbo IDI a few months ago. Up until recently, it's been running smooth as butter, save for the two times I ran it out of fuel. As of recently, when I get the truck to temperature, it starts blowing huge clouds of blue smoke (and occasionally white, especially if it's been running for a while and I've been traveling constantly at high RPM like on the highway), has little power, and make a horrendous rattling/gnashing noise, when either my foot is halfway to the floor or it's revved past 2,000RPM, sometimes as low as 1,500RPM. I have a hunch it's either the injectors or the fuel pump but I'd like to be sure before I replace either (eventually both will be replaced, but I need to know which needs to be done asap). Does anybody have any ideas as to what could be causing this?
EDIT: It starts just fine hot or cold. No excessive cranking. And it idles perfectly fine, no smoke out the tailpipe. It's only when the engine is revved or the go pedal is pushed halfway to the floor after it's been running and driving for a good 15-20 minutes.
EDIT2: During some of the longer drives I've made recently, when keeping the engine at 1,500rpm and above for over 30 minutes or so, it shakes and shudders like there's a misfire, but if I back off the throttle, it'll go back to purring like a kitten.
EDIT: It starts just fine hot or cold. No excessive cranking. And it idles perfectly fine, no smoke out the tailpipe. It's only when the engine is revved or the go pedal is pushed halfway to the floor after it's been running and driving for a good 15-20 minutes.
EDIT2: During some of the longer drives I've made recently, when keeping the engine at 1,500rpm and above for over 30 minutes or so, it shakes and shudders like there's a misfire, but if I back off the throttle, it'll go back to purring like a kitten.
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