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04 F-350 250000kms Injectors replaced 3000k ago. Truck intermittently blows white smoke. Is this an indication of failing injectors or a egr cooler on the way out?

My uncle has one of those trucks. It's an 84 S-15 ext cab,2wd with a 2.2 isuzu. It's had a turbo added which gives it adequate power if you don't have any hills. However, it sounds great and gets 40mpg!

It will stay pinned above 15psi until the computer goes into limp and I get no boost. A minute later, it will kick the fuel back in and I'm back to an overboost situation.

I checked everything twice and it all appears to be correct. Seems to do it worse the warmer the engine gets.

97 Chev K3500. Put a boost gauge on and had a reoccurring problem with overboost. It would hit 20psi if I didn't watch it. How many engines are wrecked from this problem on engines without boost gauges? If I did not have one, there is no way I would have noticed a problem.

I don't think the guy ran it at all with coolant in the oil, it likely just drained in there from sitting. The bearings should have been sitting in oil so I'm hoping there OK.

Turns out there is also antifreeze in the oil. Truck has been sitting for several years and appears to be hydrolocked. Could it still be just head gaskets?

I put in the 5521 pump. It runs like a top.

No hydro lock. Truck is a 97. Would hydro lock indicate a cracked cyl wall?

It's a truck that's for sale I'm looking at. Guy said that antifreeze started disappearing out the exhaust so he parked it, and then stole the rad for a different truck. 250000kms, full load, nice body and interior. Could probably get it for $1k. I have several good heads from another...

Is antifreeze disappearing out the exhaust a sign of a blown head gasket or something more major?

Cleaned the grounds (that looked really clean!) and the problem went away.

I can recheck them, but the truck only has about 10000kms since we swapped the motor in and they were all clean then.

What's the best way to check it? What should I look for?

The weird thing is that the truck runs great.

98 Chev K2500, 200000kms, transplanted engine from 94. Truck has been running great. Last night it would run for a few seconds and stall. Started it this morning no problem. Truck runs great, but now throws P0216 and P1214. I'm assuming that the no start has something to do with the new...

Here's a pic of how I installed the T for the boost gauge and my unmolested wastgate.

I just notice it by the boost gauge. It doesn't surge. As near as I can tell, everything is completely stock.

The 1500 is an S engine, while the 3500 is an F. The 1500 will top out at 15psi and then settle down to 10psi. The 3500 as I said bounces around under heavy load. I've also had it go to limp mode (I guess), where it will only develop 3 or 4psi for awhile and them jump back up and start bouncing...

I've done nothing. Maybe my cheap boost gauge is inaccurate. I just put a T on the port the the IAT mount in on the intake manifold and get the boost pressure reading off of there.