Twin turbo ls overheating issue

[spongbob]

Puffing out of cover ? Motor could need break in oil like chevron or kendle" ?or worse broke ring/s could a need a steel moly ring...( hastings)...high heat output :someone will say cats plugged I would think valves tight or leaking .either way if you don't find it you will have to go over everything even re Tighten head bolts/ studs...of coarse back flush the radiator.some motors can shed debri that shuts the tubes off im not knowing yours is...you have got to have really good sealing valves and valve settings/ train whatever" to run the coolest Temps period ,it's not going to be late timing...good luck

 

[81cutlass]

Some people will bypass the thermostat by leaving it out or plug the heater ports and on an LS they are required to route the coolant flow into the places that need cooling, so if you have a Tstat and the heater ports are looped, that's a good first check.

Do you have hot water going into the rad? If you put a temp probe into the rad through the cap, is it 180F+?

Is the water coming out of the rad hot? Or is it cool?


If the water is going in hot and out hot, it's an airflow issue.
If it's going in cold, it's internal block or flow issue
If the water is going in hot and out cold but it's still overheating, it's probably a volume issue

Stick a temp probe in the rad and touch the return hose on the rad and figure out where the heat is going (or staying)

 

[carnutjw]

I'm ignorant of LS and turbo issues, but if you are running twin turbos (intercooled I assume), that's a lot of heat under hood. Do you have any hood vents, cowl hood, etc. to allow more airflow through the engine bay? The intercooler could obviously be another airflow obstacle as well.

 

[melloelky]

creeping up at idle? from what temp to what temp?are the fans triggered or set on kill all the time?

 

[Rt Jam]

If it's fine on the highway and creeping up while stopped. Start with fans.

 

[64nailhead]

Some questions : ‘heating up’ - what does that mean EXACTLY? For reference, 215 is not hot and 225 is starting to get warm and 235 is close to hot. How much run time on this? Has it been driven at highway speeds for more than 3 minutes? What is the timing, AFR and rpm at idle? What ECU?

 

[mclellan83]

Some questions : ‘heating up’ - what does that mean EXACTLY? For reference, 215 is not hot and 225 is starting to get warm and 235 is close to hot. How much run time on this? Has it been driven at highway speeds for more than 3 minutes? What is the timing, AFR and rpm at idle? What ECU?

You ask too many questions man

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[johnnunez29]

Some questions : ‘heating up’ - what does that mean EXACTLY? For reference, 215 is not hot and 225 is starting to get warm and 235 is close to hot. How much run time on this? Has it been driven at highway speeds for more than 3 minutes? What is the timing, AFR and rpm at idle? W

Some questions : ‘heating up’ - what does that mean EXACTLY? For reference, 215 is not hot and 225 is starting to get warm and 235 is close to hot. How much run time on this? Has it been driven at highway speeds for more than 3 minutes? What is the timing, AFR and rpm at idle? What ECU?

no highway speeds. cars not THAT road worthy. needs a complete alignment. ecu i terminator xmax. i havent gotten past 225, i shut it off at that point.

 

[johnnunez29]

creeping up at idle? from what temp to what temp?are the fans triggered or set on kill all the time?

fans were set at 190 and 205. i have since dropped to 170 both. still oH

 

[johnnunez29]

I'm ignorant of LS and turbo issues, but if you are running twin turbos (intercooled I assume), that's a lot of heat under hood. Do you have any hood vents, cowl hood, etc. to allow more airflow through the engine bay? The intercooler could obviously be another airflow obstacle as well.

2" cowl