Since I'm running 347 tms already 2000 miles on it. Oil changed 2nd time. Runs great, nice and smooth. But now it starts to blow out white smoke upon first start up then no smoke. Water temperature sensor works. Oil pressure is good. Any idea what could be causing this?

 

Again. I let truck park for an your to cool down and test yes it would smoke out when it start up. Pretty upset. Any idea what it cause? Valve seals?

 

White is normally coolant or maybe extra fuel.

Blue smoke would be oil.

 

But my coolant never losing. I'll double check in morning to start up see if any blue. If blue would be cause on what oil. Valve seal?

 

Valve seals, oil making it past the rings.

Also don't rule out cooler weather, if this the first times you have started the truck in sub 50-60 degree temps, it will "smoke" out the exhaust because of the hot exhaust gases and the cooler air.

 

You could also smell it..... See if it smells like burnt oil?

 

If it smells like oil, it's oil.

If it smells sweet, it is coolant.

If it smells like regular exhaust, it's just condensation.

 

Yesterday was like 65-70 degree weather. Just smell like burnt oil somehow. Which could be. I only had 2-2500 miles in it. Brand new motor from Thompson
Motorsport builted me iron 347

 

Best thing to do is post a video of a cold start up.

I believe someone else here on the forum has a similar issue with the same vendor.

 

Thompson has a serious **** poor rep with motors

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