firing up cold just after an oil change i noticed blue smoke quite heavily. wondering what this would mean for a 12 valve with the mods i have (all listed in sig) i let it run for maybe 5 minutes and it didnt seem like it was clearing up anytime too soon, and was smoking me out, so i went ahead and shut her off.

other things to note, old oil was SUPER sludgy, the fuel screw is turned up on the I.P. (not sure if that is in signature), and the fuel shutoff solenoid is failed right now so i have to shut off by means of choking off turbo. waiting for new solenoid in mail. i dont think any of these things would cause blue smoke but i just wanted to mention just in case.

 

There should be a shut off lever on the IP, maybe a little easier on the cylinder walls then choking it out.

Blue usually means lube oil. If compression is good, usually from seals in the turbo. If the air piping between the turbo and engine is oily, you've found it.

If it gets too bad, the engine could run away.

 

shut off lever on the pump... not sure i have seen this. i had the pump off before and never saw it. where is it located?

so ill do a compression test, and see what i get. then if that is good i will check for oil in my intake pipes to show that my turbo is leaking.

never thought the engine would run away because of burning oil...

thanks

 

It's on the outer side of the IP

What do you mean by super sludgy? Water in oil? Or fuel ? You could have a bad injector too. These old girls will haze a bit until they warm up

 

If you're looking at the FSS its just to the left. Rotates CCW to shut off the fuel. Its where you'd attach a manual shut down pull.

 

I would pop an intercooler tube off and check for oil inside it, before doing the compression test.
I like to start looking at the simple and easy stuff first.
Taking off one end a I/C tube, checking it out, and re-installing is a 1 min. job.
I have seen a few well oiled tubes, from turbos that leak oil.

 

I hate to say it, but blue smoke and failing to shutdown normally in my experience means the injection pump is failing. The plunger gets jammed up with debris from the pump, preventing shutdown.

If it were burning enough oil to make blue smoke you should be able to notice the oil level on the dipstick dropping relatively quickly. If you check it daily for a week or two and the level doesn't change, then it's almost certainly the injection pump.

In my 1st gen I always mixed 1 - 2 gallons of used oil in with the fuel during the winter months, and I never got blue smoke.

 

Blue might not mean anything. Mine smokes blue if the weather outside is anywhere near freezing temperatures or colder. Basically mine hazes blue all winter long. In the summer it's a faint black haze. Could be that.

Sent from Tapatalk 4 via a Galaxy S3

 

The likelihood of an engine going into "runaway" on worn out parts is nearly impossible.
Even the pullers that run away are usually force-fed that oil and every runaway I have seen has no intercooler between the intake and the compressor housing.

It takes a LOT of oil to fill an intercooler to the point that it actually reaches the engine, much less the engine burning it, under normal circumstances.

Trust me, I drove a truck from California back to Nebraska that used 12 GALLONS of oil and burned blue as the sky on decel and light acceleration, with NO runaway.
The intercooler was 1/4 full of oil when we removed the engine, so if there were EVER a chance of runaway, then I missed the boat.

I'd really like to see this theory of a stock truck doing "lube oil runaway" put to bed.

Mark.

 

I don't know if Washington state has changed over to winter fuel yet , but across the line here I've been told by a few guys its the winter fuel.

 

I think the theory here is to know what exactly run away is.

Too much fuel

That's all run away is. Fuel can be diesel, propane, waste oil or even the crank case oil. It's hard to do when you have a good engine and IP. Even by dumping oil down the intake with a strong IP and engine it regulates it rather well.. RPMS are hard to settle but I've never seen it go past the limit. We had a truck blowing out blue smoke all the time, found out the injector was stuck and diesel was just dripping out of it.

For a stock truck, I would say it's very hard to have a runaway. Usually when you start tinkering it causes things to fail because of the increase load limits.