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White smoke

Tiny
PERRY L. KERBY
  • MEMBER
  • 1998 INFINITI Q45
  • 4.1L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Replaced knock sensors and re-assembled. Car ran great for less than one minute then it started putting out lots of white smoke and started running rough. Also showing a change in oil level.
Thursday, May 4th, 2017 AT 1:33 PM

5 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,879 POSTS
Those are signs of a leaking cylinder head gasket. Your mechanic can perform a chemical test at the radiator to verify that.
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Thursday, May 4th, 2017 AT 4:59 PM
Tiny
PERRY L. KERBY
  • MEMBER
  • 4 POSTS
Took the intake system apart and checked manifold, plenum and throttle body and their appeared to be no damage. There is also coolant in the throttle body and intake manifold. Drained the oil and found their was between two and half and three gallons coolant in the oil. Re-assembled, checked all connections and put in new oil and coolant. Started the car and the same thing occurred.
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Thursday, May 4th, 2017 AT 7:29 PM
Tiny
PERRY L. KERBY
  • MEMBER
  • 4 POSTS
Forgot to mention the first time when I tried to start the car it cranked for less than one cycle and froze-up. I manually cranked it back and then it started okay.
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Thursday, May 4th, 2017 AT 7:52 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,879 POSTS
Changing the fluids is not going to solve the problem. It sounds like the leak is so bad, a cylinder filled with coolant. That is called "hydro-lock". Liquids cannot be compressed, so the piston cannot move, and the engine will not crank until that liquid leaks out somewhere, which in this case sounds like it was past the piston rings and into the oil.

The head gasket is a big job, but it is important to be aware that antifreeze will melt the soft outer layer of the engine bearings if it is allowed to sit in there for too long. That will more than double the already high cost of repair.

To verify this, remove the spark plugs, then try to crank the engine. If you see coolant shoot out of one of the holes, the head gasket is leaking.
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Thursday, May 4th, 2017 AT 8:19 PM
Tiny
PERRY L. KERBY
  • MEMBER
  • 4 POSTS
Thanks for the help. Will get on that right away.
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Thursday, May 4th, 2017 AT 8:34 PM

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