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Excess engine smoke from 2004 XJ8

I own a 2004 XJ8 and recently we have replaced the engine due to head gasket crack. Now the new engine is causing so much smoke that covers the entire car. I have recently replaced the O2 sensors (cost me $750 for 2) and the car still smokes a lot. After talking to a different mechanic from St. Louis (an expert in cars specially Jaguars) he said this: "there are two possibilities: 1) to start the car and let it warm and open the engine cap; if the smoke comes out of the top then the engine is no good and must return it back to the original seller. 2) if no smoke appeared from the top, that means the oil from the replaced engined has turned to a "Cake" and needs to be flushed out. The way it works is that when the oil is pumped up to the head gasket, it must drop down through the valves into the bottom of the engine housing and that is not happening. if there is an interruption of any kind, the old oil starts burning by mixing with the new oild and create very thick black smoke as it appears in my car. Solution: open the spark plugs and look at the end of the tubes and if we can see the dirt built up then use air hose to flush/push down the dirt/debris into the bottom of the engine, then open the screw at the bottom and flush/push down the mixed oil out of the engine with the air hose to get all the mixed oil (cake) out of the engine. After making sure all the mixed oil is out of the engine, then tighten the screw back at the bottom and pour new synthetic oil and look for smokes. My question is; would this be the ultimate remedy to our problem because I really trust this mechanic from St. Louis? Thank you!

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: car idling - carburetor

If you have oil in the water it smacks of a problems with the gasket or a crack in the head. Did you tension the head with a torque wrench? Did you retension after the first drive, with engine cool? What do the spark plugs look like?

Did you adjust the ignition timing after replacing the points?

Posted on Sep 13, 2008

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SOURCE: White smoke coming out of exhaust even when engine is warmed up.

on the 3.8 ussaualy not the head gasket but the upper intake gasket . antifreeze leaks inside intake and into the cylinder. very common. the new gaskets are much thicker.or the plastic plenum the black plastic part on top of the engine goes bad around the water inlet and need to be replaced . when i do either job itell the person to replace both at same time saves money and headaches in the near future. hopes this helps .....and cost for a shop to do this $1100 to $1500

Posted on Dec 08, 2008

  • 69 Answers

SOURCE: Same problem , car has only 86,000 miles

replace that thermostat again...flush radiator any way...then see how it runs...

Posted on Aug 28, 2009

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SOURCE: White smoke and the smell

Bradley,
You have stated two problems. Coming to second first. Smell of burning rubber. in the car rubber is only at two places where it can burn, The tyres, unlikely as you have not commented upon your driving habits. Some people like to rev the engine so much before take off that the tyres go burning for the first few hundred meters. And then there is rubber on the wires and cables. You have to check the wires for any heat while the engine is running.
Coming to the first now. White smoke is generally of unburnt fiel and not oil. Oil alwayd give black smoke and that is the indication you get when the exhaust is giving black smoke. That means that the engine is consuming oil. if it is white then that indicates that the engine is cold and burning more gas/diesel. Is your a diesel vehicle?? But as you say it from under the hood. And that too behind the engine block. May be that the gasket is leaking from somewhere. If you could check the engine oil level for a few days early in the morning before starting the engine. If the level drops and the exhaust tail pipe does not blacken your finger when you rub it in it would mean that the oil is being burnt. Now what I suggest is that with the engine running and hand brakes on, go under the car with hood open and try to locate the source of the smoke. I am sure you would be able to locate it.
Then we talk again.

Posted on Dec 23, 2009

  • 1 Answer

SOURCE: newly overhauled toyota corolla 2e engine emits black smoke

I have toyota corona 3s engine it smokes black and fuel consuption is high we have changed the engine oil and cylinderhead gassecate but still black smoke is comming what should i do

Posted on Mar 29, 2010

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