Hello, I am a new member from Saudi Arabia
First, excuse me for the weakness of my English
I have a problem that appears monthly and I don’t know what it is. A slight tremor appears for a few seconds. Once, an check engine flashes twice for a second !!
The examination showed that I have a misfire in the third cylinder + random misfire what are the reasons?
The agency thought it was coil #3
Is the problem of coil come and go or permanent all the days!
My car is xj 6v supercharge 2013

 

Not hard to believe that a coil could be intermittently faulty. Does the problem happen particularly under certain circumstances, like when you've been sitting in traffic on a hot day? Heat is often a factor with this kind of issue.

 

I didn't notice that ، What are the reasons for cylinder3 misfire ?

 

Avl Rebel, it could be something as simple as the heater hose happens to run over the top of the coil or there is a lack of air flow in the area of that cylinder. On the V8 engines, we have issues with the #5 cylinder which would sit in about the same spot. NOrmally, when a coil is starting to go, you can find a white hair line crack in the coil that if the coil is subjected to water (from a puddle or rain), it will cause the coil to act up. BUt, once at temp and not splashed again, it will work fine.

I have also been seeing a fair number of injector issues with these engines. This is where if you have a high concentration of ethanol in your fuel (above the max allowable of 10%/, this can reduce the amount of lubrication that the injector sees, leading to early failure.

 

Yes, I had a leak in the heater hose and I changed the hose before 2 months !!

 

There is a code P0366-00 a camshaft sensor , is it the cause misfire ?

 

If the engine is not picking up the camshaft sensor RPM, it could affect its calculation on knowing how much air is in the cylinders. Granted I would expect a P0300 code too, not a P0305 code. If it is a timing thing, this would be seen on all cylinders, not just one.

 

In the first test I have a problem with the third cylinder "p0303
+ p0300 random misfire detected
+ system too lean at idle bank 1 and 2
+ P013E - O2 Sensor Delayed Response - Rich to Lean + bank 1 sensor 2
+P014A heated O2 Sensor Delayed Response - Rich to Lean bank 2 sensor 2
+p0366 camshaft position sensor b circuit
..
now In the new test there is no problem in the third cylinder.
just p0300 random misfire detected + system too lean at idle bank 1 and 2
+ P013E - O2 Sensor Delayed Response - Rich to Lean + bank 1 sensor 2
+P014A heated O2 Sensor Delayed Response - Rich to Lean bank 2 sensor 2
+p0366 camshaft position sensor b circuit..
What is the reason and what should I do ?

 

help plz

 

Avl, based on your new codes, it is sounding like your cam shaft sensor is shot and you will need to replace it. It is that or a wiring problem going to the cam shaft sensor. To differentiate between the two, you will need to unplug the camshaft sensor, remove the sensor from the engine, and then connect a multimeter to the 2 pins of the sensor (sett he multimeter to read 2 VDC). At this point, what you are going to want to do is find a large metal object (large screw driver, piece of flat steetl, etc) and pass it near the tip of the sensor. You should see the multimeter jump as you pass the metal object by the tip. The closer and quicker you pass the metal object, the more the multimeter will move. But, if you hit the sensor, you can damage it. So, this is where I would take a lot of practice swings and slowly work towards getting closer and faster. If you see the multimeter move, then you have a wiring problem in 1 of those 2 wires. If the sensor does not show a response, then the sensor is bad.

 

Did this engine problem show up before or after you changed the heater hose?

 

Thermo Thank you very much for your help

 

after

 

You have several error codes so first erase everything and drive the car some more.
What we want are repeatable codes so we can follow them to the proper repair.

But right now it looks like cylinder #3 needs a plug or coil and you have a bad VVT sensor.
The random misfire means the they were fast and then stopped so the system could not identify which cylinder had the misfire.

Let us know what codes return.
.
.
.

 

yes the codes return is
P013E - O2 Sensor Delayed Response - Rich to Lean + bank 1 sensor 2
+P014A heated O2 Sensor Delayed Response - Rich to Lean bank 2 sensor 2
+p0366 camshaft position sensor b circuit
What are the harms of not changing the oxygen sensor ?

 

I agree with the suggestion that the camshaft sensor sounds likely.

I wouldn’t change O2 sensors first. It’s unlikely two went bad at the same time. It’s more likely the oxygen sensor code is caused by the camshaft problem.

 

Avl, not changing the downstream sensors has no real negative effects. The biggest that I can think of is maybe you might fail emission inspections if your area has them. But, like was said, changing them out most likely will not correct your problem anyways. The only thing it is going to do is lighten your wallet.

Change the camshaft position sensor and then lets see what we have at that point.