General engine diagnostic question

[PetroleumJunkie412]

Let's play "how fast can we find the problem"

Im going to give observations and test results.. feel free to tell me to perform diagnostics and ill post results.

Looking for your best guess "whats wrong with it"

no comment on which engine it is.....





This engine has developed a horrible case of gigantic smoke plumes at startup, runs rough enough at idle to occasionally stall and shakes the truck quite a bit. sounds like multi cylinder misfire, but too loud and awful to tell. Smokes the entire time it runs, white blue in color.

Struggles to idle but still has some potency off idle, bone dry rad, milkshake in the oil pan, puking oil and coolant out of the exhaust

Haven't done glove test on rad yet

Exhaust pulses oddly. Some pulses positive pressure, some negative. Going to guess vac gage is the same.


Ya'll have the floor

 

[scotts90ranger]

engine is barely going vroom... solved!

um, it's broken... my WAG is head gasket and a broken piston, if spark ignited fouled plugs from running so bad and if compression ignition stuck valve or bad fuel injector?

There's all sorts of other combinations with stuck piston rings or exhaust valves stuck down or burnt valve that can kick in but I don't deal with catastrophic mechanical failure often enough to guess more...

 

[Dirtman]

Its broken.

 

[adsm08]

Do a compression test. Do all cylinders on both banks unless you find a dead hole, then skip to the other bank. After that pull the valve covers and look for missing valves.

If diesel also check EGR coolers for internal leaks.

 

[rusty ol ranger]

Headgasket/head that failed catastrophically and took rings with it.

Possibly a cracked block between two cylinders.

 

[Curious Hound]

Get a bucket of warm soapy water and a soft rag. Wash out the cup holders and then the ashtray. Add new pine tree air freshener to rear view mirror. Do not remove old air fresheners. Turn up volume on stereo.

Fixed!

 

[1986RangerXL]

Get a bucket of warm soapy water and a soft rag. Wash out the cup holders and then the ashtray. Add new pine tree air freshener to rear view mirror. Do not remove old air fresheners. Turn up volume on stereo.

Fixed!

Add a "For Sale" sign stating "Runs like new!"

 

[8thTon]

Coolant and oil systems open to combustion chambers, or at least to the intake. Head gasket or cracked block/head.

 

[Ramcharger90]

Bro, it sounds like you got it set to James Bond mode.

Sounds like we need your ride down in Philadelphia right now.....

 

[Uncle Gump]

It sucked a valve... bad things happen after that.

 

[8thTon]

It sucked a valve... bad things happen after that.

Possible, but unless it then punched a hole into a coolant passage it doesn't explain the coolant part.

 

[Uncle Gump]

It did... it's one of the bad things

 

[Uncle Gump]

And... if it's a 4.0LSOHC like the one in your new parts truck... It most likely jumped time and self destructed.

 

[19Walt93]

My guess is an internal coolant leak into the oil being sucked into the PCV system.
Rather than guessing, tear it apart and find out what happened. You're going to have to go through the engine anyway to fix the problems caused by the coolant/oil intermix. Good luck.

 

[Ramcharger90]

Could it have just washed out a ring or 4? Or is that wishful thinking....