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I have the same problem with my engine, Iīm from Chile, I have a Nissan Murano 2006 model with VQ35DE engine.
I have read a lot of posts and information about these problem so I have change the 2 fuel dampers (new, original Nissan part) and also change the six spark plugs one step colder (NGK LFR6AIX-11). First I change the spark plugs, no solution to my problem, then I change the 2 fuel dampers and the engine is still knocking.
I really like the Nissan Murano, but i canīt fix the engine knocking.
About 6 months ago, when the engine was already knocking the first thing I do was advanced timing in 2 degrees, now my engine is supposedly set in 17°, from factory is set at 15°.
One mechanic that work in a Nissan Dealership said my that when they advanced my engine timing 2 degrees, this is only done by the Nissan Consult only for testing, and so my engine is not set at 17, is still in 15°. (Iīm not sure about these information)
The next step Iīm going to do is go to a Nissan Dealer and connect the consult, to now what timing is set my engine, if it is 17°, the mechanic is wrong.
I wanīt now retard the engine timing, maybe Iīm going to put again in 15° or maybe 14°, to know if these fixes my engine knocking.
Do someone have really fix these problem of engine knocking?
How can I solve these problem?
Waiting for your replys
Thanks Eric for the answer.
This Monday or Thuesday I will go to a Nissan Dealer to connect the Nissan Consult (II or III) to my Murano and set the timing back to 15° (factory setting) o maybe 14°, to test if the knocking problem in my engine disappears.
Like other members that have this problem, we all donīt now why when the engine is cold (first minutes drive in the morning, or first start with the engine cold), the engine donīt have this engine knocking problem. The knock appears only with the engine in normal work temperature.
One question: Can I have my knock sensor in bad condition and get no code error in the Nissan Consult? Is not supposed that if my knock sensor is bad I have the MIL light in the dashboard iluminated?
Detonation (knocking) occurs when the heat of compression causes the fuel to ignite before the spark plug fires. This is worsened when the engine is hot, obviously. That's why there is no knocking when the engine is cold. Also, as the engine is warming up, it runs a richer fuel mixture which is more resistant to premature ignition. At operating temperature, the computer leans mixture which is more prone to knocking.
There is no code for the knock sensor, I believe. And even if there is, it is an internal ECU code with no check engine light. Consult can find it, but the best diagnostic is the one in the shop manual where a simulated knock (hitting the engine block with a wrench actually) should trigger the knock sensor to throw off a voltage signal to the ECU.
Something else worth checking out is the condition of your cooling system. Is the coolant temp sensor in good order? How about the thermostat? If the engine is running hotter than it should be, then knocking can be an issue.
Well it's been 2 highly recommended local Techs and 4 trips to Nissan dealer in Detroit Area and still no resolve.
During the cold weather it does not knock/ping but as soon as the temps got into the mid to upper 30s the ping was back. Took it to the dealer and I can't replicate it and there is NO codes and the Tech said the timing is dead nuts.
Also it is now burning about 1 quart of oil every 1000 city mile driving.
I have a possible new development that I'm thinking may be an issue.
When I drive the car in the morning or when the engine temp is below normal range the car does not ping, as soon as the temp reaches normal the engine operating RPM changes and the ping is there. It seems fuel related but I'm not sure, if I run cheap gas it pings with a vengeance. When cold the RPM's on take off are around 1800 to 2000 and the second the normal range is reached the take off RPM's change to 1500 and come down to 1100 before going back up as i accelerate and it pings like there is no tomorrow, if I get on it ....no ping.
So, my question is this, what controls the engine RPM when the temp reaches normal? I know the trans does not shift but the RPM's act like the car is shifting and at slow speeds that is when I get my ping, and I'd I lightly apply the brake to put a load on it there is no ping.
(I would accept any phone calls on this issue if anyone wants to discuss it because I'm not really good at typing a good description of the issue.)
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