Copper plugs

[R33vit]

I just changed my plugs. Put NGK copper BCPR6ES in and since then the car has had a miss now and then at idle.. Mind you it had coppers to start with and it ran smooth as before the change..

Anyone got any idea's as to what can be causing this??

[benm]

What price did you pickup the plugs for ?

What are they gapped at ?

[2rismo]

Dude, if you fitted BCPR6ES they were probably gapped to 1.1mm. Check and see if the part number is actually BCPR6ES-11. If so, I would make sure you gap them to 0.8mm before you install them again.

Remember, it is always a good idea to check the gap with feeler guages even if you're not changing it.

If you are running higher than standard boost, I can strongly suggest BCPR7ES-11 gapped to 0.8mm. These are exactly the same plug but one heat range colder. They should only cost the same as the 6's @ about $4- retail. I pay about $2.65.

Good luck.

Adrian

[Guest RedLineGTR]

Thanks for the info 2rismo

[R33vit]

Thanx for the reply guys.

I did gap em to 0.8mm before hand.

Ben

I cant remember what they cost, I walked in and pickup a few other items at the same time..

Adrian

Im boosting to 10psi but this is a miss at idle dude. I have noticed I dont have an ignition amp mounted on the coil cover near the firewall. There was never one there when I purchased the car and I had no idea there should have been one, but the car ran fine before the change of plugs..

Wonder if one of the coil packs or wiring harness may have a problem after moving them?

[Busky2k]

Put in the old plugs agian and see if the miss goes away...

[R33vit]

Put in the old plugs agian and see if the miss goes away...

I was going to do just that. Next time a get a spare 30 min..

funny thing is the old plugs where a USA brand Autolite APP3924-11 Double Platinum... There worn out and the gap is at over 1.7mm :headspin:

Still the car ran fine as they where and managed to pull a 13.9 at WSID