Jump to content
SAU Community

Recommended Posts

Hey guys I have a question or more of a second opinion.

I bought my GTR up recently (hasn't been driven in 14months) and it has a misfire throughout the rev range, cold or warm.

I babied it home where it has been sitting waiting for some attention.

Now I know it could be a number of things but today I pulled the coil packs and plugs for a little look.

I found the coil packs seemed to be in good condition, the rubber boots are perfect, however the coil pack loom is hard and crunchy, some of the clips were brittle and breaking - so I Imagine fairly buggered.

Now the plugs....so the middle two plugs have me a little worried, they where pretty dirty, a little wet looking and smelt pretty heavily of petrol. The other 4 seemed the normal light brownish colour, dry and decent condition.

So Im thinking a few things, MAF or coil pack loom causing it to run rich....it would also explain the dirty rear bumper.

Has anyone got any opinions? I'm fairly new to RBs.

Edited by gtr judd
Link to comment
https://www.sau.com.au/forums/topic/433525-fouled-spark-plug-questions/
Share on other sites

Yea my plan was to drop all fluids and a major service as I'm not sure of the service history. I cleaned and gapped the plugs to .8

As for the injector, it doesn't smell like fuel on idle or while driving. How is the best way to check?

I know it had a leaky injector 6 years ago lol. But I'm not sure if the one injector was fixed or new o rings throughout

Edited by gtr judd

I think your on track. Give it a good service.

and

Clean AFM's

Drop your fuel out and start a fresh. Replace fuel filter

$30 for 6 new NGK BCP7RES plugs.

Grab a new injector loom to by the sounds of things to.

Ps. if your concerned about the injectors I have some Denso 720's

Edited by Sinista32

I think your on track. Give it a good service.

and

Clean AFM's

Drop your fuel out and start a fresh. Replace fuel filter

$30 for 6 new NGK BCP7RES plugs.

Grab a new injector loom to by the sounds of things to.

Ps. if your concerned about the injectors I have some Denso 720's

I will clean the AFMs today, I have a can of cleaner floating about. The tank is nearly empty, so getting rid of the stale fuel shouldn't be hard :)

Are copper spark plugs a better option over iridium's or similar? How much more regularly do they need to be changed?

Are the eBay looms OK or should I get one from a site sponsor, I have been lookin at Kudos?

720s would be a nice step up but then it needs a tune etc, I'll wait till its all running nice before I start upgrading lol. I might take mine out and get them cleaned and checked.

Chuck some O2 sensor and temp sensor action in there too.

These could also cause richness if they're stuffed.

Yea good idea,I'll ave a look at them too

Thanks for your help guys.

Edited by gtr judd

Irridiums on a stock GTR are fine and last 2-3 yrs - Cost $150

Copper on a worked GTR up to a year - Cost $30

Edit: cant comment on E-bay looms - never bought one.

Shouldn't be to exy for OEM off one of our traders.

Kudos is the cheapest you will find.

Edited by Sinista32

Irridiums on a stock GTR are fine and last 2-3 yrs - Cost $150

Copper on a worked GTR up to a year - Cost $30

Edit: cant comment on E-bay looms - never bought one.

Shouldn't be to exy for OEM off one of our traders.

Kudos is the cheapest you will find.

My Gtr is stock motor wise besides a cat back exhaust, so I might just go the coppers for the moment.

Sweet I'll get in to contact with them and see what I can do.

Edited by gtr judd

After I cleaned the plugs the other day and re installed them I never started the car, a couple days later I went to and flat battery. I have been swamped with work and one of my boys birthday party's (20x5 year olds :/) as well as football but today I started it

...........

Its alive again, no misfire, ran 1000x better.

Yay can't wait to get it all serviced and running 100%

  • 3 weeks later...

Oh are they? Thats is on my to do list.

My misfire comes back intermittently but then drives ok, so I'll replace the plugs shortly and see, the loom definitely needs looking at, being all crunchy etc

From about 3600+ it would misfire and would cut the engine off at 5000. Changed sparkies and coilpacks - from memory. Rob may have a better memory as it happened in the first week of purchasing the R33 to which I first entered the scene.

Ahh ok, mine has a slight missfire on idle and as soon as you give it any throttle its coughs and farts

I really dont have the money to be throwing parts at it to fix it yet, but once my other car sells and my wedding is 100% paid I will be much happier too

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

    • The sodium acetate, mixed with citric acid, doesn't actually buffer each other. Interestingly though, if you used Sodium Acetate, and acetic acid, THAT becomes a buffer solution. Additionally, a weak acid that can attack a metal, is still a weak acid that can attack a metal. If you don't neutralise it, and wash it off, it's going to be able to keep attacking. It works the same way when battery acid dries, get that stuff somewhere, and then it gets wet, and off it goes again breaking things down. There's a reason why people prefer a weak acid, and it's because they want TIME to be able to be on their side. IE, DIY guys are happy to leave some mild steel in vinegar for 24 hours to get mill scale off. However, if you want to do it chemically in industry, you grab the muriatic acid. If you want to do it quicker at home, go for the acetic acid if you don't want muriatic around. At the end of the day, look at the above thumbnail, as it proves what I said in the earlier post, you can clean that fuel tank up all you want with the solution, but the rust that has now been removed was once the metal of the fuel tank. So how thin in spots is your fuel tank getting? If the magazine on the left, is the actual same magazine as on the right, you'll notice it even introduces more holes... Well, rust removal in general actually does that. The fuel tank isn't very thick. So, I'll state again, look to replace the tank, replace the fuel hanger, and pump, work out how the rust and shit is making it past the fuel filter, and getting into the injectors. That is the real problem. If the fuel filter were doing its job, the injectors wouldn't be blocked.
    • Despite having minimal clothing because of the hot weather right now, I did have rubber gloves and safety glasses on just in-case for most of the time. Yes, I was scrubbing with my gloves on before, but brushing with a brush removes the remaining rust. To neutralize, I was thinking distilled water and baking soda, or do you think that would be overkill?
    • You can probably scrub the rust with a toothbrush or something. After you get the rust off flush well with water to neutralize and you will probably want to also use a fuel tank sealer to keep it from rusting again.
    • The sodium citrate solution is designed to buffer the citric acid to keep it from attacking metal quite so much, the guy that came up with that recipe did a ton of testing on how much metal loss occurs over time and it's nothing crazy unless you forget about it for months:   
    • Ohhh I see lol To be honest the main reason why I wanted to start modding is because of a business trip to Japan and Indonesia. I saw many cool and modded cars all throughout in these countries, especially Japan. I myself am of Chinese+Japanese nationality and when living in china (never lived in Japan js my dad side lol) I remember staring at these cars pass by with their loud tacky exhausts and insane wide body kits. And when I went back to Japan, I got even more invested even asking people about their cars and why they modded. Most gave similar answers to what you said but funny enough one guy just said that he saw the need for speed movie being filmed once in Tokyo I think near Shibuya Crossing and got inspired to tune and mod. After that I just started to fantasize on owning a car like that. Also tbh I prefer the R32 over the R34 it's just the R34 is more iconic lol (also apparently better aftermarket support than the R32) and my only goal really is just to make the car mine and make it fun to drive. As much as I love my Cayenne it's pretty bland to drive. Sure the interior is nice and pretty, gives you attention yada yada but I've wanted to experience what it is like to have a car that is truly yours. I suppose thats the goal so far. Haha if you find where I'm from, then sure. Ill help you out on your next "financial decision"
×
×
  • Create New...