Jump to content
SAU Community

Recommended Posts

Hey Guys,

been having a misfring problem so decided to rip out the plugs. ECU is not giving any codes so I'm pretty strongly thinking its them.

I've got NGK Iridum's BCPR6EIX-11 which I was told by the mechanic who put them in are gapped to .8mm. ( I need to get a feeler I know)

In the pics, The one from cyc 1 is black (fouled?), the rest look fine so should I replace them all with coppers and gap to .8mm or replace the 1st one only?

Any suggestions would be great, thanks!

Yepp, no.1 is a bit fouled, you should be able to buy just one and replace it cause the others look pretty good.

While the plugs are out, run a compression test if you can, see what the deal is with no. 1.

Also make sure they are gapped down to .8mm... Oh, and clean up the end of the plug where it connects onto the coil thingy (up top), maybe give it a light sand to give it a clean surface to transmit the electricity through.

J

Jay your a champion!! Thanks for helping me out again!

BTW ran through the ecu codes with the other lack of low down power and came up with code 13. Water temp sensor. Has now been replaced and car 'seems' to have picked up some mid range. Maybe the fault retarted timing or something? Dyno run soon will see.

Thanks again mate, I'll head out now and get a replacement and a feeler.

Cheers!

Well I ended up getting coppers (BCPR6ES) because A) no-where I went had them in stock without ordering them in next week and B) the gap on the current ones was 1.1m, and as you guys said gapping them isn't a good idea unless you want to break them.

I gapped them to .8mm and after taking my car for a hard 10min run on ~11psi (in like 7c ambient temp) I'm happy to say the misfiring has dissapeared when before it would have been chronic.

Thanks for the help!

maxim

what is you vehicle ??

because if it is a series 1 rb25det they have weak coils in them and sometime when they are trying to fire iridium spark plugs they dont work to well because of the lower grade coil.

if it is a series2 rb25det then you should have no problems running iridium plugs..

get some carby cleaner and give the coils a good clean with the cleaner , outside and up inside where the plug contacts the spring of the coil..

if you have something different then ignore the different series of coils info..

Hey Sato,

It's actually a 180sx with an series 1 rb25det conversion. I've got Splitfire coils which apparently are pretty good.

After I changed and gapped the new copper plugs seems to be running fine apart from some heitation on cold starts. Running 11psi on a cold (Canberra) night seems to be fine too.

I will clean the coils however as when I was looking at them seemed as if they had been in there for 100 years!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • That is surely the biggest gathering of Stageas in North America, ever!
    • Remember kids - if you can't afford to buy 2 GTRs......
    • I know people cry at the price of the Getrag 12-14k for a conversion now, but it really is a nice mid point. Not going to get change from 10k on a gearset installed.  $30k++ for sequential.   I know you run the risk of a damaged used one and parts are hard to get but as a street car gearbox its really hard to beat. If you enjoy a more traditional manual, its the choice no question.     
    • Time to decide what’s more import, your power level or your budget because you’re going to struggle to keep both 
    • Our Southern Highlands Cruise is proudly registered with “R U OK?” Day.  Sometimes the best way to check in on your mates is by getting out for a drive together. Sharing a common passion like cars creates the perfect space to chat, connect, and support each other.  A simple “R U OK?” can make all the difference. Let's enjoy the drive, the company, and look out for one another. PLEASE WEAR YELLOW FOR “R U OK?” DAY Sunday 14th September 2025 9:30AM Meeting Crossroads Homemaker Centre 10:00AM Cruise Departure Via Old Hume Hwy 11:45AM Arrival at Mittagong RSL Club Meet Location: Crossroads Homemaker Centre Final Destination: Mittagong RSL Club *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
×
×
  • Create New...