the turbo 5.3 died

With the smoke does it have a "metallic" weird taste? Do you have a test light or noir lights to make sure injectors are pulsing and not getting constant signal. Possible injector stuck open? When I was working out the base idle tune on my megasquirted turbo neon had similar issues but weird that you're truck was fine and now acting up. Leads me to mechanical. On you single low cylinder pull plug see if there is oil again also drop little bit of oil into cycle and do a compression check. If pressure comes up quite a bit prob a ring problem. Just throwing out possibilities.

I'm gonna check injectors tonight. I'll make sure they're pulsing and probably go ahead and pull them out and clean them . I did notice when we had the comp hooked up to it that it took a while for the o2 sensors to warm up and start reading properly.

Check coolant and air temp sensors make sure they are reading properly. Computer could be putting more fuel in if it thinks ambient is -20 below... Should only take the ecm a few moments to go into closed loop.

Just bought new coolant temp sensor. Air temp sensor? I thought the maf read the air temp?

it does but who uses a maf these days pfffff

I do ! Lol

I really didn't read the entire post but first thing, do a compression test.
Could be a broken ring land or cracked piston.
Typically a minor piston break doesn't cause any bore damage.
On budget repairs I've seen single pistons replaced. Quick hand hone. New rings. Slap another piston in and be done.
However most do a full rebuild and upgrade.
You might even get a used piston for free from someone.

Just considering the options. Let us know!

Temp sensor!! 10 bucks and 15 min later the truck fires right up and idles like a champ! No more smoke!

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Originally Posted by jansen

Temp sensor!! 10 bucks and 15 min later the truck fires right up and idles like a champ! No more smoke!

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congrats....that never happens to me...lol...it's always the worst sanerio for me...lol

Its weird how one small cheap part can cause a huge headache of a mess to figure out when you think your vehicle is done for.