Plz Help! R33 Majour Issue

[dineth]

Hey guys, I Have a 93 R33 Gts-t Auto

I was wondering if someone could help me with my issue:

Part 1:

I'm ok with my car stuff but this has totally stumped me! I was driving on to the freeway and started to put the foot down when i felt the boost cut come in, but not like usual, not as sudden but more linear if that makes sense....the problem here is that i have set my boost so that i dont ever get boost cut even on cold days!

Part 2:

So i started to keep it at 90ish km/h when the hicas light came on. I pulled over and restarted the engine and the hicas light turned off, now this is when all hell broke lose!

Part 3:

All of a sudden the car started to sound like a big chevy v8. At low revs the inside of the car rumbles and shakes pretty bad and the power seems to be gone...although the boost seems to be still there. The runs like crap now and sounds or feels nothing like my old car! its very rough but the engine itself seems fine, oil is fine, it seems to be from the exhuast but the exhuast seems fine from the outside too. I dont know what it is, i want to get an idea of what can be wrong b4 i give it to someone to have a look at it! the car almost feels and sounds like its running on 4 pistons or something,...but as i said the engine itself seems fine and sounds normal....but the exhuast note is very different.

i dont know if the turbo has gone and is blocking my cat or something, but then again i didnt see a big cloud of smoke and even now i got a mate to have a look and theirs no heavy smoke at all and i still seem to get boost if i put my foot down (but i hvant dont it as much for obvious reason)

PLZ HELP! any feedback is most welcome!

[dineth]

also just to add, when i started my car again after it was set to cool, it was fine back to normal for about a minute but as soon as i put my foot down, the rumebling came back again!

[Zas)-(]

not sure if its any help .. but last time i had a rumble with my r33

it was an exhaust issue one of the gaskets had come loose so check them mate.

but yeah i'd have a look at the exhaust

[lighty01]

cooling system issue?

check if you have enough coolant in there.. hows the temp guage?

could even be missing.. sparkies coils leads.

or your comp could have had its last words..

thats a pretty broad range of things to check.... buh yeh... its all i could think off..

hope it helps

good luck

[Advent34]

sounds like you're running on 5 or less cylinders.. but what do i know.

[cowie165]

Hi dude. The symptoms you've described are something major. I'm sure plugs/leads/battery/etc. are fine. Your fuel pump could be stuffing up, which could explain the 'boost cut' feeling but not the v8 noise. If you've blown an exhaust turbine you'd see those sypmtoms - the busted wheel would stop you from increasing compressor pressure, and would only get worse. You would only see smoke if you've busted a turbo oil seal and it was spitting oil out through the turbine and exhaust wheel.

If the turbo is fine, you may well have busted a cylinder. A compression test will tell you more. That'd explain the v8 noise and rough performance. Once again, you'd feel a 'boost cut' because the compressor is compressing the air going into the cylinder, but as a ring set is probably stuffed, you aren't actually maintaining the pressure in the cylinder - the 'boost' is leaking out. The exhaust note will be different because the volume of exhaust air has changed.

This isn't a DIY fix unfortunately. Dude I recommend having it towed to a workshop for inspection. Either way, sadly it isn't looking good. I don't know what the deal is with the HICAS light.

Mate I hope you can report back what you find.

Mark

[cowie165]

not sure if its any help .. but last time i had a rumble with my r33

it was an exhaust issue one of the gaskets had come loose so check them mate.

but yeah i'd have a look at the exhaust

A busted gasket would explain the noise but not the change in performance. It'd drive the same but sound like a rally car.

[dineth]

Thanks for all your reply's guys, i have a feeling that it maybe the coil pack (s) thats totally gone and not sparking so the cars running on like 4-5 cylinders, I'm guessing thats the reason why its fine when its cold but a few mins of driving makes the car sound and go like crap, when i listened to the engine carefully i can hear it mis, so i hope fingers crossed its coil packs...which should be a easy fix, either way i gave it to my mechanic today to see what he thinks it is...will keep you guys posted to see if this was the case!

Thanks Heaps again for all your posts! you guys are awesome as always!

[Vince66au]

Hey guys, I Have a 93 R33 Gts-t Auto

I was wondering if someone could help me with my issue:

Part 1:

I'm ok with my car stuff but this has totally stumped me! I was driving on to the freeway and started to put the foot down when i felt the boost cut come in, but not like usual, not as sudden but more linear if that makes sense....the problem here is that i have set my boost so that i dont ever get boost cut even on cold days!

Part 2:

So i started to keep it at 90ish km/h when the hicas light came on. I pulled over and restarted the engine and the hicas light turned off, now this is when all hell broke lose!

Part 3:

All of a sudden the car started to sound like a big chevy v8. At low revs the inside of the car rumbles and shakes pretty bad and the power seems to be gone...although the boost seems to be still there. The runs like crap now and sounds or feels nothing like my old car! its very rough but the engine itself seems fine, oil is fine, it seems to be from the exhuast but the exhuast seems fine from the outside too. I dont know what it is, i want to get an idea of what can be wrong b4 i give it to someone to have a look at it! the car almost feels and sounds like its running on 4 pistons or something,...but as i said the engine itself seems fine and sounds normal....but the exhuast note is very different.

i dont know if the turbo has gone and is blocking my cat or something, but then again i didnt see a big cloud of smoke and even now i got a mate to have a look and theirs no heavy smoke at all and i still seem to get boost if i put my foot down (but i hvant dont it as much for obvious reason)

PLZ HELP! any feedback is most welcome!

im thinkn u need new coil packs

[Pauly33GTS-t]

get it tested for compression first if you havent done it recently, and if your were to buy coilpacks id only go with splitfires so that the issue is fixed properly, nothing like putting coil packs in ur car that you dont know anything about. At least if you do the test you'll know what kind of shape your engine is in.

[cowie165]

im thinkn u need new coil packs

Good call.

The original post missed out that the problem is only intermittent :sorcerer:

[12VES]

I agree. It sounds like you have a coilpack arching out when the engine warms up. I'd go for splitfire coilpacks, I put a set in my 32 and I'm more than happy with them, they're well worth the money.

[dineth]

yup, i'll try new coilpacks and see how it goes...fingers crossed!

[cosworth1971]

sounds like you popped a FMIC intercoola pipe off?

[blind_elk]

Does it run a coil igniter module? If so, they are prone to breaking down when they get too hot - would explain the symptoms only occur after the engine starts to get hot, and running 4-5 cylinders.

[cowie165]

sounds like you popped a FMIC intercoola pipe off?

The problem goes away when the motor is cold, whereas a piping problem would stick around.

[dineth]

i just got a call from my mechanic that after replacing the coil packs the issue seems to be resolved! which is great news for me! ye my mate told me about the FMIC piping could do the same thing, but i had a good look at it when he told me and that wasn't the case.....so as it stands now the issue was coil packs...i wonder why skylines run coil packs instead of ignition leads? cos everyone has issues after time with coil packs...

PS:

Thanks again for all your reply's guys, gotta love SAU!

Edited July 20, 2007 by dineth

[Godzilla32]

You have to have an ignition coil of some sort to amplify the ignition voltage. The reason they use more than one coil is to enhance spark strength and by having then directly mounted ontop of each cylinders spark plug this eliminates the use of HT leads which have their own fair share of arcing problems. Unfortunately after 10 or more years the extreme heat that the coil packs are subject to gradually deteriorate them.

Deren

[dineth]

ok got the car today guys, running like new again thank god, it was 2 of the coil packs that was totally gone! was running on 4 cylinders! so its all good now! thanks again for all your help!

[cowie165]

Hey great result dude.