Is My Cat Converter On Its Way Out

[NFSR33]

hey everyone,

let me set the scene.....recently my car has been makin noises, like the car is struggling, but can only been heard through exhaust..

now, it only happens after about ten minutes of driving (when the cars warmed up) and usually at low RPM or when the cars travelling at below 60....anything above and the car sounds fine..

my initial reaction was that the spark plugs were going, so i got a service and tune and the guy siad mechanically its fine (engine wise) which leads me to the conclusion that is an exhaust fault...

would this be the cat converter going on its way out?

has anyone had similar problems?

i have to drive to melbourne over the long weekend coming up so i wanna make sure its running perfectly!!

thank you!!

[Eug]

an exhaust shop will be able to give you a proper diagnosis.

tap the cat to see if bits are rattling.

[NFSR33]

an exhaust shop will be able to give you a proper diagnosis.

tap the cat to see if bits are rattling.

cheers mate

the only day i have off is sundays and no exhaust places down my way are open then, so time management is an issue.

plus, if i take it to an exhaust place without knowing myself what the fault is then im more likely to get scammed.

(if i go and say i THINK my cat is going, they will just replace it whether it is or not...haha)

i tapped the cat converter and couldnt hear anything rattling..

may be starting to block up tho

Thanks

[Eug]

what kind of noise is it?? the components in an exhaust (cat & muffler) do degrade after a while, and especially so if you've been running rich

if you are able to, unbolt the cat and have a look for yourself

[r33cruiser]

why not just unbolt the cat....if it is flanged that is.

its a 10min job. and u can be 100% sure on whether it is the problem

[GTS4WD]

why not just unbolt the cat....if it is flanged that is.

its a 10min job. and u can be 100% sure on whether it is the problem

You may need to soak the nuts and bolts in WD40 for a while.. And breaker bars are a good idea too. Save yourself a whole heap of effort, trouble and problems..

Edited April 16, 2008 by GTS4WD

[R338OY]

Correct me if i'm wrong, but i don't see why a rooted cat would be restictive at low rpms and get better at higher rpms. Wouldn't it be crap regardless, and more so at higher duty?

Does the car backfire often?

Anyhow, it's better to eliminate it- so pull off the cat.

[CDA]

you say it starts struggling 10mins into the drive... do you get the "check engine" light? if there was something truly wrong with the exhaust im sure the "Exhaust" symbol would light up

[NFSR33]

you say it starts struggling 10mins into the drive... do you get the "check engine" light? if there was something truly wrong with the exhaust im sure the "Exhaust" symbol would light up

yeh it seems to be after the car has warmed up....for example, i could be parked at the lights and it feels like the cars dropping out but only for a split second..like, the RPM gauge will go from 1000RPM to 700RPM then back up within a second, but it does that continuosly until i reach above 80kms an hour.honestly it is so hard to explain so sorry for the confusion..

i just got the exhaust put on, like in a matter of two weeks..

its been through services and tunes, so i know it isnt running rich, thats why i am assuming its the cat, but the Symptoms (so to speak), are a bit different than usual cases...

Yet to take cat off,but will friday..called in a sicky!!!

cheers!!!!!!

[NFSR33]

honestly it does sound exactly like backfiring, but a little quieter..

[NA_Goodness]

I thought when the cat's going, it rattles when the car is cold, then stops when it has warmed up? Thats what mine is doing, although when you hit it, it doesnt rattle. I'm very confused now... I've lost so much power, and the car feels restrictive to drive, and it all happened around the time the clicking started. Any ideas?

[scotty014]

i get a rattle in mine when its cold but when warmed up its fine it happens between 2 and 3000rpm ill probably take it to an exhaust shop for them to look at it and see what they think. but then ive herd its normal for N/A r34's like how N/A r33's have that rasp.

[NFSR33]

update............

ok, this is really really annoying me...

been to the mechanics twice, paid for two different services and the problem still exists..

my r33 is misfiring, at low RPM and at Idle....does anyone know what could cause this...the longer i drive it, the worse it gets

- i have already got the spark plugs checked, ECU, Catalytic converter, full service and tune, O2 sensor checked, solanoid, basically everything....now, im due to go to the mechanics 2moro, but they are saying it may be the fuel injectors....

where as im leaning towards a vaccuum leak, hence the reason the misfiring is consistant during idle...

has anyone had similar problems...need help!!!!!!

Edited April 23, 2008 by NFSR33

[scotty014]

have you checked the coilpacks, it might be that.

[Eug]

have you checked the coilpacks, it might be that.

agreed, i'd check those before injectors...

coil packs seem to be failing quite regularly now days that skylines are getting older.

remember that these cars are over 10 years old and yet we expect them to perform as if they have just come off the showroom floor.

[NFSR33]

OHHHH forgot about Coils

cheers everyone!!

[NFSR33]

update time....

so i took it down to my mechanic....got it looked again...(3rd time)

told him that i CAN only be two things, injectors or coils...as every other alternative has been checked and disregarded...

low and behold, its the coils...

but the bad thing - the price - $850 for set....

HOLY SHIT!!!

haha

car is booked in once again, for monday to get coils done..

will update if the problem is resolved...if not, get rady for alot of curse words..

[Eug]

WHATEVER COILPACKS YOU'RE BUYING DONT BUY THEM!!!

http://www.skylinesaustralia.com/forums/Sp...99-t188698.html

splitfires for $499... doooo eeeeeeeeet!!!!

glad we can help

[NFSR33]

WHATEVER COILPACKS YOU'RE BUYING DONT BUY THEM!!!

http://www.skylinesaustralia.com/forums/Sp...99-t188698.html

splitfires for $499... doooo eeeeeeeeet!!!!

glad we can help

$499, for spitfires for an rb25de?

F U C K...!!!!!!! sorry about swearing

ive already got em ordered, exact same ones for $850 fitted..

im p'd off....

damn, i shoulda posted em earlier, woulda saved myself considerable amount of $$$

thanks for the help!!

and for makin me look retarded hahah kiddin..

[inthisglass]

cancel your order fast?

you can put them in yourself in about 15 minutes