Ignition Coil Misfiring

**Timbuk2**

The car is an '05 1.6L Petrol Nissan Primera, less than 50,000km on the clock.

Was driving when I noticed that the fuel economy was becoming worse, then the car began to shudder when at slow speeds and became difficult to build up power, then the engine light came on.

A friend who's a mechanic looked at it, said it was one of the 4 ignition coils misfiring. He swapped the misfiring one with another one and it still misfired in the new position so he concluded the problem must be the ignition coil itself and replaced it with a spurious one.

This appeared to fix the problem, the car was running perfectly. Over the next 4 days, I drove over 800km and there weren't any issues until I noticed the car started to shudder in third gear (although it was fine in 4th and 5th) and when I moved out to overtake a tractor I couldn't get speed up easily. Low and behold, engine light came on again.

The mechanic looked at it again - turns out the new part had misfired and replaced it with a genuine Nissan (not spurious) ignition coil, and the problem appears to have been fixed (again).

This was only yesterday so I'll have to wait and see - why would it go again after being replaced, and is it likely to happen again?

Nissan doctor

**Timbuk2** wrote: »

The car is an '05 1.6L Petrol Nissan Primera, less than 50,000km on the clock.

Was driving when I noticed that the fuel economy was becoming worse, then the car began to shudder when at slow speeds and became difficult to build up power, then the engine light came on.

A friend who's a mechanic looked at it, said it was one of the 4 ignition coils misfiring. He swapped the misfiring one with another one and it still misfired in the new position so he concluded the problem must be the ignition coil itself and replaced it with a spurious one.

This appeared to fix the problem, the car was running perfectly. Over the next 4 days, I drove over 800km and there weren't any issues until I noticed the car started to shudder in third gear (although it was fine in 4th and 5th) and when I moved out to overtake a tractor I couldn't get speed up easily. Low and behold, engine light came on again.

The mechanic looked at it again - turns out the new part had misfired and replaced it with a genuine Nissan (not spurious) ignition coil, and the problem appears to have been fixed (again).

This was only yesterday so I'll have to wait and see - why would it go again after being replaced, and is it likely to happen again?

If the first replacement was a cheap brand ie, not bosch etc, then it could have failed.

Its unlikely to be anything else if the misfire followed the coilpack when it was moved to another cylinder.

What was the recorded fault that caused the light to come on?

**Timbuk2**

I think the recorded fault was that Ignition Coil #2 was misfiring - not positive about that! Thanks for the answer, hopefully the genuine replacement coil will solve the problem!