Question about Cars & Trucks
Code p0128 refers to coolant thermostat-coolant temp below thermostat regulating temperature ====causes mechanical fault
that probably means that the thermostat is stuck open
As to your question "will it cause a knock?" it is possible because the operating temperature of the engine is below what is required for proper combustion and the knock may be the excessive piston clearance until the piston heats up and expands to take up that clearance . I suggest that the thermostat be check out first and replaced if necessary and see if that stops the noise
Posted on May 13, 2014
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Posted on Jan 02, 2017
SOURCE: Knocking until car warms up
Sounds like a lifter noise. worn lifters can't keep oil in them anymore so over night the oil leaks out. when you start the vehicle, you will hear a ticking noise or knocking noise till the lifters fill with oil again. only remedy is to replace the lifters.
you could try an additive but it's temporary.
Posted on Dec 24, 2008
SOURCE: experiencing a
it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise
Posted on Oct 26, 2009
lack of service probably the cause try thicker oil or stp engine wear oil has it been stood for a while? if so recomend new oil and filter make sre you flush old oil out with cheap oil then proceed with oil change you can use oil flush too the oil should be golden once started after a week check oil again for signs of emulsification on the cap
Posted on Dec 15, 2009
SOURCE: vortec 350 knock on start-up.
Is it a ping or a knock? It could be the initial timing is not set correctly. Are you losing coolant? It could be a leaking head gasket and is leaking a small amount of anti-freeze into one of the cylinders. If it is a bearing it will get worse and worse, is the oil pressure good? I guess I'd take it back to the rebuilder.
Posted on Mar 27, 2010
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