R33 Car Troubles

[R33Gtst Driver]

Hey i need help with my r33 gtst

I bought it like a month ago. when i first bought it it was running smooth and good

the only problem it had was blocked radiator (i didnt figure it out for a little while)so it over heated if you gave it a bit but it was fine if you didnt give it any.

since then i got my mechanic (who is a really close mate of mine also) to give it a service, gear box fluid, diff fluid, engine oil and oil filter change radiator flush, with all the best raceing/synthectic fluids that are used in the evo 9s and 10s

artfter that It still had a miss at around 5,000 rpm wich got worse becuse i didnt get the spark plugs done stright away didnt realise how much platinum plugs were. (used to have a ford and there $2 a plug)

so last weekend i got off my ass and took my radtiator to nat rad and got them to clean the cores and replace the tanks in the radiator and i also did the spark plugs.

it ran fine for like a day maybe like 80% 90% pulling no over heating and still hasnt even on a hot day full giveing it to trying to make it over heat it was barely sitting on halfway in the hottest part of the day. then i realised i had filled the radiator with pure concentrate radiator fluid. so i flushed it again like yesterday or the day before and mixed it with water and i put it back in.

now its missing again and its getting worse but its still not over heating:)

im thinking its a fuel pump or filter - my mate did test the fuel lines and filter he said seemd good ie not blocked. my mate thinks the fuel filter is good. he is just to busy to check the fuel filter amps and pressure, id test thes amps my self but my muilti meter broke. and i dont know how to or have the tools to test the fuel pressure.

the other thing i think it could be is and so does he is a cracked head/f**ked head (i hope not) i have checked the radiator for oil and the dipstick and oil filler cap/head for coolant and every thing seemd fine everthing where it should be. i havent done a compression test (havent been able to get the tools) and my mate has been to busy.

Is there any mechainics or someone who knows enough about skylines that i can get to just take a look for me and give me a defenate answer?

cause i don't wanna bother buying a new fuel pump if its a cracked head id rather save my money and get a rb26 front cut.

thanks in advance for any help or suggestions

[CeJay]

Try Autotech in Fyshwick, Trojan in Mitchell or Gas Tune in Tuggeranong. I don't know much about these things. But it may be possible that it's your coilpacks.

[R33Gtst Driver]

Try Autotech in Fyshwick, Trojan in Mitchell or Gas Tune in Tuggeranong. I don't know much about these things. But it may be possible that it's your coilpacks.

thanks i didnt think about coil packs ill look into it

[Bluprint]

From what it sounds like, it is your coilpacks.

It's a very common problem with Skylines.

When they get hot it (such as your overheating problem) it expands the cracks in the coil packs that they get when they get old, and this causes the spark buildup in the coils to arc out and reduce the strength of the spark sent to the spark plugs. The amount of air going through the engine is enough to blow out the weakened spark hence you get your missfire above 5000rpm.

The temporary fix is to tape up your coil packs to try and close up the cracks and also to gap down your plugs to 0.8mm instead of the factory 1.1mm.

The real fix is a new set of coilpacks.

[Simmo1985]

You've got like a 90% chance it will be coilpacks / spark plugs etc.

The other 10% chance would be stuff like fuel filter, fuel pump etc. What fuel are you using? Could also be fuel if you've put some dodgy stuff in. I only put BP Ultimate in mine.

[redevil]

similar thing happened with mine.... now running split fire coil packs and haven't had the problem since

[BNR32t]

I would do a comp test before paying for coils.

You can do it your self with a compression testing tool from repco. (i think they are under $50)

If compression comes up good get coils.

[datto260Z]

Yes, but with the coilpacks, you will still have peace of mind that your coils arnt going to go wrong later and also you get a power increase from running them, not mention a more efficient engine. I would still get them even if they arnt the problem. My 3c.

PS I did this and it fixed my problem.

[race_snooze]

coils!!! or plug gap, gap should be .8 also you can use copper plugs instead of the $100 worth of platinum though I have never dont that myself but hey lots of people have and I can see a prob with stock use

[Bullet32]

Im sure that its a simple problem.

Use the "process of elimination" technique.

Buy a can of carbi cleaner from Repco for about $10.00

Check and clean your air flow meter first with the carbi cleaner, if the thin wire inside is caked in crap that will cause the computer to lean the engine out because it doesnt think its getting enough air flow, this will create a miss in the top end.

If that doesnt fix it run the engine and spray the carbi cleaner CAREFULLY* over the inlet manifold, if the revs pick up and the engine seems to run smoother then you have a blown inlet manifold gasket.

*The reason I say carefully is because carbi cleaner is highly flammable and you dont want the can blowing up in your hand

Third, if the first steps dont work, find someone with an RB25DET that will lend you their Crank angle sensor, if you swap yours over for another one that you know works and it makes the engine smoother and more responsive then your CAS is on the way out.

Fourth - Check amps and pulse on the fuel pump, see if it is getting constant flow.

Fifth - Pull out your coil packs, clean them thouroughly, tape the plugs and tips up with decent masking tape and spray them with a heat proof enamel black paint, this should help to insulate them and stop any spark arcing out the side before it reaches your spark plugs.

If these steps dont work, I would do a compression test and see to see if your rings and valves are still ok.

Good luck

[mjfawke]

Check and clean your air flow meter first with the carbi cleaner, if the thin wire inside is caked in crap that will cause the computer to lean the engine out because it doesnt think its getting enough air flow, this will create a miss in the top end.

Nissan doesn't use a hot-wire air-mass meter, it uses a thin-film resistor meter. Personally, I have cleaned one that was covered in oil... but it did fail a month later. Some caution is required here.

[datto260Z]

geezus, talk about appearing out of the woodwork Michael Where have you been?

[Bullet32]

Nissan doesn't use a hot-wire air-mass meter, it uses a thin-film resistor meter. Personally, I have cleaned one that was covered in oil... but it did fail a month later. Some caution is required here.

I didnt say what kind of AFM it was I just said clean it... I know that it improves the response and smoothens the idle if you do it properly because I have done it on multiple RB25's and RB20's and it has worked everytime.

[R33Gtst Driver]

Thanks heaps guys ill try all these things and i only use that 98 octane fuel in this car i accedently put like $5 worth of that normal unleaded like 3 or 4 full tanks ago

Edited December 12, 2007 by R33Gtst Driver

[mid life crisis]

platuim and iriudem plugs are good for lasting a long time ie in the back bank on a v6 camry where the plugs are hard to get too . from a performance view there not so good ive proved this many times in many cars racing speedway .i just use copper plugs in my skyline gapped down to .8 they have been in there 12 months and havent missed under load once so far . personally i would rather change copper plugs more often than use iruidems ect ect they just seem to fire better . my personal opinion is ngk plugs seem to work the best for me

cheers midlife crisis

[Bullet32]

platuim and iriudem plugs are good for lasting a long time ie in the back bank on a v6 camry where the plugs are hard to get too . from a performance view there not so good ive proved this many times in many cars racing speedway .i just use copper plugs in my skyline gapped down to .8 they have been in there 12 months and havent missed under load once so far . personally i would rather change copper plugs more often than use iruidems ect ect they just seem to fire better . my personal opinion is ngk plugs seem to work the best for me

cheers midlife crisis

+1, Agreed.

[R33Gtst Driver]

I would do a comp test before paying for coils.

You can do it your self with a compression testing tool from repco. (i think they are under $50)

If compression comes up good get coils.

ohh and i did have the computer checked for codes/errors and there was none on it

[CeJay]

I've also got a spare set of coilpacks at home, will have to check there condition, but happy to lend them to you to try out. Didn't really have a missing problem with them, apart from the occasional thing.

[oscar32]

platuim and iriudem plugs are good for lasting a long time ie in the back bank on a v6 camry where the plugs are hard to get too . from a performance view there not so good ive proved this many times in many cars racing speedway .i just use copper plugs in my skyline gapped down to .8 they have been in there 12 months and havent missed under load once so far . personally i would rather change copper plugs more often than use iruidems ect ect they just seem to fire better . my personal opinion is ngk plugs seem to work the best for me

cheers midlife crisis

Agreed +2. Always just used copper and made stacks of power. I never really had any issues with them, and replaced them every 12 months or so I used them with splitfires though, which kicked ass.

Cheers

Anthony

[R33Gtst Driver]

I've also got a spare set of coilpacks at home, will have to check there condition, but happy to lend them to you to try out. Didn't really have a missing problem with them, apart from the occasional thing.

yeah that would be awsome if i could borrow/use them to test it out thanks heaps for all the help ppl i didnt expect this much help