Bad Missfire Happening When Car Is At Running Temp

[Jay_stylz]

hey guys well been having this problem for a while really have no ide awhat it could be i have changed the coilpacks and plugs still have the same issue any idea what it could be? it almost sounds like what happens when u hit the speed limiter soo im really confused and is making me really angry also the car has a miss when idleing and is worse when its hot

any ideas?

[Bozz]

Injector plugs dodgy?

Narrow it down to which cylinder by unplugging one injector at a time until the misfire doesn't change

[Jay_stylz]

Injector plugs dodgy?

Narrow it down to which cylinder by unplugging one injector at a time until the misfire doesn't change

yeh thinkin i might have to do that aye but if i do that and find out whihc one it is how can i fix it?

[Bozz]

Elimination.

Say it's cyl #2

Swap the coil pack between #1 and #2 and see if the fault follows the coil pack. New coils can be faulty too.

If it doesn't, remove coil number 2 from its mounted position, put in any spark plug, earth the body with a jumper lead, disconnect injector number 2 (so you dont foul the existing plug) and start the motor. Identify if you have spark.

If you do have spark, the injector could be faulty or the wiring to the injector could be faulty.

If you do have spark, and the injector is firing, check the compression of the cylinder when the engine is cold and hot.

Narrow the fault down and come back with your results.

[neofenrir34]

does it have any problem when cold? How many Km's has the car done? Like it is hitting the limiter? My car had a similar problem at one point around 40 000km mark. When accelerating hard it would be like it hit limiter and the tacho would sometimes jump around like crazy even at 3000rpm, it would also miss and carry on when hot, sometimes when cold anyway after about a month of trying to figure it out a light came on the dash i took it into work and got it put on the nissan consult, i had a code for the O2 senor (which has main effect when car is hot) so i replaced it and problem fixed. In short your problem maybe the O2 sensor starting to fail? maybe?? just a suggestion hope it helps