Misfire issue - please help

[Dion-ZN]

Hi guys, I recently had smoke coming from the exhaust and was told the valve stem seals needed to be fixed - which I did, only issue at the time was the smoke and it needing oil all the time.

The mechanic also replaced the Bosch plugs which I got from BMS, with NGK's. I used the car once and it started misfiring, I have JB4, the cones from BMS and downpipe. The mechanic then changed 3 coil packs, which he was told that was faulty by distributor centre Durban. I took it to work the next day, and the misfire is back. I used the fault reader on the JB4 at work and cylinder 1; 3;4;5 was misfiring. I went straight to the mechanic and did the fault reading again, only this time it was cylinder 1;2;6 that came up. After a few check, different cylinders come up.

We gave the plugs back to NGK who tested and reported that the plugs are working at 100%.

Any suggestions guys, I really don't know what else to check / do..

 

[Nikhil]

Injectors maybe?

 

[Dion-ZN]

Injectors maybe?

would the JB4 not pick that fault up, as it didn't tell me anything about injectors?

 

[Nikhil]

Not sure if it would

 

[Kish2604]

The problem is hugely obvious based on your post...

The NGK plugs were not gapped down to 0.52mm or 0.02Inches... the factory setting on the NGK is 0.8mm which is to big for the spark to be effective..

Regap the plugs and buy us lunch after it works...

:ty:

 

[Nikhil]

Ow Kish to the rescue

 

[Dion-ZN]

The problem is hugely obvious based on your post...

The NGK plugs were not gapped down to 0.52mm or 0.02Inches... the factory setting on the NGK is 0.8mm which is to big for the spark to be effective..

Regap the plugs and buy us lunch after it works...

:ty:

I just chatted with the ngk rep, and he mentioned that the plugs cant be gapped. do I try an gap it anyways?[/size]

 

[Kish2604]

The problem is hugely obvious based on your post...

The NGK plugs were not gapped down to 0.52mm or 0.02Inches... the factory setting on the NGK is 0.8mm which is to big for the spark to be effective..

Regap the plugs and buy us lunch after it works...

:ty:

I just chatted with the ngk rep, and he mentioned that the plugs cant be gapped. do I try an gap it anyways?[/size]

Yes they can be gapped and those of us who use them on our N54's use a feeler gauge and close the gap on the electrode down to 0.52mm... and there is more than a handful of us...

Any mech worth his salt will be able to gap them but just in case please don't put them in a vice as the insulation material can crack... rather get an extra set of hands to hold the plug and tap the electrode firmly with a ball pin hammer with the gauge inserted.

 

[Dion-ZN]

The problem is hugely obvious based on your post...

The NGK plugs were not gapped down to 0.52mm or 0.02Inches... the factory setting on the NGK is 0.8mm which is to big for the spark to be effective..

Regap the plugs and buy us lunch after it works...

:ty:

I just chatted with the ngk rep, and he mentioned that the plugs cant be gapped. do I try an gap it anyways?[/size]

Yes they can be gapped and those of us who use them on our N54's use a feeler gauge and close the gap on the electrode down to 0.52mm... and there is more than a handful of us...

Any mech worth his salt will be able to gap them but just in case please don't put them in a vice as the insulation material can crack... rather get an extra set of hands to hold the plug and tap the electrode firmly with a ball pin hammer with the gauge inserted.

Thanks...I will do just this.

 

[Kish2604]

Feedback???

 

[Dion-ZN]

Feedback???

hey, still waiting for the rep to return my plugs to Township spares. will let you know this afternoon.