Exhaust valve

Tiny
MARJIE HILLS
  • MEMBER
  • 2006 NISSAN X-TRAIL
  • 2.2L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 155,342 MILES
My car is running rough and burning through gasoline fast. The mechanic changed the spark plugs and boots. He said the scan picked up a misfire on the fourth cylinder. He said I should replace the ignition coil. All of that was done, but I have the same issues. I took it back and now he says it is the exhaust valve that should be replaced on the fourth cylinder.
How long should it take to replace this exhaust valve? Also, given the age and mileage of my car, is it worth it?
Thursday, November 16th, 2017 AT 11:36 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
I would not just do the vale on that cylinder, the all valves should be checked and re seated as required. Also a crack check and re surface. The problem with this is that the engine may start to burn oil as cylinder pressures will increase and this can show up weak rings, it is a bit of a vicious circle. I would think that the miles you have done, the bottom end should be fine and a top end overhaul should not be a problem. I will ask one question, has the engine been using oil between services? If so this will probably increase with a top end overhaul, and if no, it should be fine.
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Friday, November 17th, 2017 AT 12:41 AM
Tiny
MARJIE HILLS
  • MEMBER
  • 2 POSTS
Thanks for your reply! Yes, it is also burning more oil than usual. As mentioned there is also a strong smell of exhaust in the car. This is sounding like a pretty big job. Is it worth going through this for a car of its age?
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Friday, November 17th, 2017 AT 8:56 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Well its really what you are comfortable with spending. If the engine is using oil now, it will require a full re build or a second hand engine, both options will be expensive but so will be replacing the car, you best get a quote on the engine work and weigh that up against getting a new car, unfortunately its all about fiances and what you are comfortable with, if your car apart from the engine is sound and you have had no other problems, a replacement engine may be a better option, unless you buy a new car, a second hand one can be a gamble, you may just be buying someone elses headache.
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Friday, November 17th, 2017 AT 12:56 PM

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