P38A Engine revs full throttle on startup occasionally

Hi,
I’ve had a diesel 99 p38 for the last six months and fixed many things . The ride performance is excellent out here in the country with the rough lanes to navigate. But one problem does not seem to go away, in that every so often when I switch it on the throttle races up to full, black smoke piles out the back and some little electrical motors in the engine compartment make a funny noise. I always turn it back off quickly, wait for a few seconds and start again whereas everything will be as right as rain.
Now I’ve looked at the crankshaft sensor (shouldn’t be that as idle is fine), throttle sensor (not that either as never happens the rest of the time only startup) and the performance chip which I removed months ago thinking that would help. I’m down to thinking it may be the timing chain and FIP but don’t know much about this.
Does anyone have any other suggestions i.e. is this a common problem? Before the thing blows itself up

Check the intake piping for signs of oil. On some turbos, the seals can leak and fill the inlet tract with oil. When first started, the engine runs on this oil uncontrollably until its ingested all the oil.

Wazzajnr said:

Check the intake piping for signs of oil. On some turbos, the seals can leak and fill the inlet tract with oil. When first started, the engine runs on this oil uncontrollably until its ingested all the oil.

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That could be it, the inlet manifold was replaced recently as had a hole on the top; it used to splatter oil out of this occasionally so there must have been a fair amount in the inlet. Thanks for the pointer.

You will get a light misting of oil in all of the inlet tracked as the turbo uses oil as its bearings , but it should not be swimming in it.

Look up runaway turbo diesel engines on youtube, see what your trying to avoid!

Sticky electric throttle spindle in the fuel pump cap?
Good point about burning it's own oil, but it wouldn't shut off with the key would it??
Maybe worn valve seals or guides? Check the fuel pump harness from the pump side to the plug just above close to the engine. Maybe rattled loose or wet..

Clean out the intercooler and the oil separator in the cam cover.