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few problems with an old motor

zach1990

By zach1990
in Ask A GM Technician

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zach1990 Senior Enthusiast

zach1990

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About a month ago my truck began spitting a little bit of smoke out of the tail pipe for a few seconds after cold starting it. The other problem is if I try to cold start and try to drive off immediately the truck just doesn't have any power to get rolling very well, but if I let it warm up to opperating temp it does just fine. Anyone have suggestions to remedy this besides getting a new motor? Id love to see 400k miles with my original motor. Trucks info is in sig and current mileage is 301k

Zembonez Senior Enthusiast

Zembonez

Posted
Posted

I've seen a number of LS motors make 350K. They get pretty tired about the 300K mark though. You can buy a low mileage used one pretty cheap. That's what I'd do!

zach1990 Senior Enthusiast

zach1990

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I plan on that when this one finally goes but for the time being id like it to run as long as possible. Its a good motor when it warms up

txab Senior Enthusiast

txab

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Posted

I'd look into the temp sending unit for the ECM. It may telling the ECM the engine is warmer and not letting it run in open loop when cold

zach1990 Senior Enthusiast

zach1990

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Where would I find it at on the truck? And is there a way to test it?

zach1990 Senior Enthusiast

zach1990

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Where would I find it at on the truck? And is there a way to test it?

 

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zach1990 Senior Enthusiast

zach1990

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Thanks guys ill look into those tomorrow when I leave the station.

 

Sent from my SAMSUNG-SGH-I927 using Tapatalk 2

zach1990 Senior Enthusiast

zach1990

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If old faulty valve seals are causing my smoking on cold starts would changing to a heavier oil help with the smoking untill I can get the cash for an engine swap if it comes to that? Right now I'm running 10w-30 castrol full synthetic with titanium so if heavier would work what is yalls recomendations

 

Sent from my SAMSUNG-SGH-I927 using Tapatalk 2

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