C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1989

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Old Dec 23, 2020 | 03:09 PM
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Default 1989

was about to replace my thermostat got the 195 degree one
found that the one in the car had a 160 degree one
but not sure if it is working or not so the 195 is ok correct >? It's factory spec
please advise
Thanks

we put in the 195 degree one no more fuel leaking from new the fuel pressure regulator we installed car starts much better and Idles good
but still white smoke out of back end of car and from both sides of engine below the valve covers my son thinks exhaust manifold ?
along with a considerable amount of white smoke out of tail pipes
what causes white smoke?

Last edited by BillDurant; Dec 23, 2020 at 04:02 PM.
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Old Dec 23, 2020 | 03:55 PM
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the 195* thermostat is the correct one for your car. you will want it in the winter for sure, especially if you live in the northern climates. even a 160* thermostat down here in jan-feb the temps would only get up to 135-140, makes for a cold drive.
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Old Dec 24, 2020 | 07:48 PM
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Is the white smoke constant or just after startup?

If leaking at the headers you should be able to hear it.
Is their oil leakage around the valve covers or from the china wall?

You can pressure test the cooling system as well as test for exhaust gasses therein.
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Old Dec 24, 2020 | 10:24 PM
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^^^^ Some auto parts stores can loan you a tester. Put it on where your radiator cap goes, pump it up to 15 lbs let it sit for hours maybe even overnight
If theres a leak youll know. Either head gasket or maybe a bad intake manifold leak where coolant is getting into your Cyl.

Hopefully your head gasket is ok..but these 113s are known for it. Not saying its bad just possible.
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Old Dec 25, 2020 | 04:14 PM
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Originally Posted by cv67
^^^^ Some auto parts stores can loan you a tester. Put it on where your radiator cap goes, pump it up to 15 lbs let it sit for hours maybe even overnight
If theres a leak youll know. Either head gasket or maybe a bad intake manifold leak where coolant is getting into your Cyl.

Hopefully your head gasket is ok..but these 113s are known for it. Not saying its bad just possible.

+1.
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