Car wont start
mmmph...any number of things may have been "cooked"...if the motor turns and the camshaft turns...would check the timing by looking at the timing marks~ what happens is Oil turns to tar and ganks up the works~ so pull your dipstick...and see if it's really oil left in there~...that's one thing~...
Ran hot due to radiator leaking flushed engine replaced radiator and water pump
a Toyota came into the shop...the woman complained that the motor was locked up...we saw there was NO OIL in her crankcase...so we put a quart in...backturned...forward...put the 4 quarts with a new filter and the Toyota started right up..no problem...what I'm getting at is you, yourself said it was sluggish...I am suggesting that you get the burnt oil out and put some 10-W-30 in~ then perhaps we will be back in business...cross your fingers~
Replaced oil when engine was flushed
regardless of thermal torture, you may need a timing belt and tensioner too~ depending on your mileage...60-90 thousand should have been done already? you may be "out of time" in other words set the indicator to TDC and see if the camshaft is correct~...probably is not at this point...but check that or have someone assure that the cam and crank are synchronous~
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