Jump to content
SAU Community

Cracking Spark Plug Porcelain Problem

unique1

By unique1,
in Engines & Forced Induction

 Share

Recommended Posts

unique1 Mentor

unique1

Posted
Posted

Im having this annoying problem on my 26/30 at the moment and i originally thought it was a one off problem and its happened on 3 different sets of plugs now.

The porcelain on the top of the plug keeps cracking away. It looks like its starting to crack from the top down. I assume its heat related but the motor is running with no coilpack cover, afr's are mid 11s and pretty conservative timing numbers too, its only running a pair of stock gtr twins and previously ran a single gt3076r as well. Its got stock 26 coilpacks, and ecu is an Autronic smc. Im also making sure i dont tighten the plugs too tight too as i thought that was possibly the cause, so i have got 2 different people to install them and they all have same problem. I cant remember what cylinders it did last time but it was on 2 of them and this time i found the worse cracked one on cylinder number 1 and then the other on cylinder 4, i dont know if its happening on the same cylinder each time.

any ideas whats causing this? anyone had the same issues? These are BCPR7ES ngk's too

heres a few pics....

post-40430-1240802498_thumb.jpg

post-40430-1240802539_thumb.jpg

The Dan Grand Master

The Dan

Posted
Posted

Whoever is installing the plugs/coil packs is breaking them.

They don't just randomly crack like that. They are either being installed incorrectly, there is a problem with the spark plug socket being used, or the coil packs are being pushed down too hard.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • dbm7
      R34 Skyline climate control unit transistor

      By dbm7 · Posted

      That's not a transistor --- it's marked ZD1 which makes it a zener diode. As to what the breakdown voltage is, not enough there to divine.
    • bilbo117
      R34 GTR Seats / No longer reclining

      By bilbo117 · Posted

      Hi all, Long time since I've posted here. Looking for some advice on what I can remove to further identify the cause of my issues.  I can move the passenger seat forward and back but the knob used to adjust the seat angle is pretty much free spinning, there's very little resistance.  Removing the side cover I can see that the chain is intact but the shaft for the adjustment spins without the gear attached to it moving.  What's my next step for disassembly here? Is this a common fault? Just being a little cautious as I didn't want to start removing bolts for a spring to fly out or something equally as stupid.  Cheers
    • joshuaho96
      Ethanol Content Sensor - Always at 11%?

      By joshuaho96 · Posted

      The incentives are mostly the same, yes. Ethanol is cheap compared to the cost of doing 98-100 RON with crude oil alone. 87 to 93-94 AKI all with E10. In 2020 Canada mandated E10 as a part of their "renewable fuel standard" and is supposedly going to go to E15 in 2030. In California where there are only 8 refineries with two threatening to shut down next year it's been over 20 years now of E10 and 91 AKI maximum because there's just not enough refinery capacity or crude oil supply relative to the demand for premium unleaded fuel. And CARB's low carbon fuel standard means functionally none of the diesel available at the pump is made from crude oil anymore. It's almost all entirely 20% biodiesel blended with 80% renewable diesel (hydrotreated vegetable oil) now. The number of gasoline vehicles that support E15 or higher ethanol concentrations is surprisingly low, I can't imagine it being wise to play tricks like this without flex fuel sensors in most of the fleet.
    • GTSBoy
      R34 Skyline climate control unit transistor

      By GTSBoy · Posted

      It's almost certainly the same as the one next to it. Have a fish around amongst these hits https://www.google.com/search?q=surface+mount+transistor+m33&sca_esv=9cb49794e0b2005d&source=hp&ei=2vJ5aNjTB7Kw0PEPldnS8QM&iflsig=AOw8s4IAAAAAaHoA6qkfmF6XcygtrZ4Vu9f92NXF_RFd&ved=0ahUKEwjYqIPP7MWOAxUyGDQIHZWsND4Q4dUDCA8&uact=5&oq=surface+mount+transistor+m33&gs_lp=Egdnd3Mtd2l6IhxzdXJmYWNlIG1vdW50IHRyYW5zaXN0b3IgbTMzMgUQIRigATIFECEYoAEyBRAhGKABMgUQIRigAUjKCFAAWABwAHgAkAEAmAHfAaAB3wGqAQMyLTG4AQPIAQD4AQL4AQGYAgGgAuYBmAMAkgcDMi0xoAfMBLIHAzItMbgH5gHCBwMyLTHIBwU&sclient=gws-wiz
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      South Australia, which is hardly as far behind as the rest pf Oz makes out, and who is also not a paragon of progressiveness (read that as over-legislation) in the area of vehicle standards, has this to say on the subject: Adjustable coil-over suspension Aftermarket adjustable coil-over suspension components are suspension units that incorporate an external thread on the main body and corresponding threaded spring saddle that allows the vehicle's suspension height to be varied. If fitting aftermarket or coil-over suspension components you must submit an Application to modify a light motor vehicle form and a report from a light vehicle engineering signatory (LVES).
×
×
  • Create New...