boriss

on a 2000 honda civic up enough to where it breaks or is this a myth

signed,
newbie

BryanM.

iTrader: (1)

I don't buy it.

cetcivic

87 is garbage

24TEN

iTrader: (2)

87 is garbage...for cars that need more than 87

HondaPartsHero

I've owned 8 cars (2 civics, 1 CRX, 1 integra, 1 accord, 1 pontiac grand prix, 1 jeep, 1 Ford Ranger) all over 150k some over 200k never used anything but 87, never replaced a cat ever.

wolfy47

I heard you should only use 108 octane on civics....do it, do it, do it

cetcivic

116 octane for daily driven cars yo

ddd4114

Maybe if it's leaded 87-octane gas...

BryanM.

iTrader: (1)

Ethanol "enriched" gas isn't good.

ddd4114

Nah, it's fine for cats.

cetcivic

ahhh what the hell?!!! remove the cat go straight pipe yo

boriss

my catalytic converter keeps breaking. i only have 100k miles on my car!

so im going to change the o2 sensors. some guy told me not to 87 gas but i think that's only delaying the inevitable cat breaking again.

is there anything else i should do?

Mrhiguy

You need to make sure you're car is running good. A slightly missing or rich running engine will eat away cats. Also, If you're buying cheap ebay or aftermarket cats then that's also your problem. Cheap cats break down every year or so. If you're going to go aftermarket. Get a Magnaflow CALIFORNIA made cat.

mavvrik

The gas has nothing to do with it. A stock civic doesnt need anything but regular grade gas. Using higher octane on a stock honda(or any other car in its class) actually causes damage over time. Eventually you'll start having pre-detention. Unless your NA built or Boosted, dont use high octane gas

boriss

crap well i bought this cat converter..based on recs from here

http://www.amazon.com/gp/product/B000E3XKQ4

took it to a muffler shop, the guy told me it was the wrong size..i needed and 2 inch and that it didn't have all the parts so he sold me a 2 inch for 80 or 100 i cant remember, it cost 180 total.

so chances are in 7 months or so this thing is going to break again.

when you say slightly missing, what do you mean? i'm worried it's like a fuel injector problem or something.

thanks everyone for replying so fast

boriss

k good, i wonder if this dude secretly worked for texaco ha..

i've had my honda cat break, then aftermarket cat, now anticipating 3rd break even though i just installed it, such a worry wart

Linked

the main thing that makes cats go bad are either misses or rich mixtures/unburnt gas

those can be cause by running a higher octane gas on a stock motor. such low compression wont atomize high octane gas so it wont ignite

and bad o2 sensors will make it spray more fuel than needed.

mavvrik

Exactly. That gas that doesnt ignite sits in the corner of your piston and builds up over time in turn causing pre-detention

ddd4114

How exactly is it breaking?

If fuel lights off in the honeycomb, you could melt it. Like others have said, that's caused by misfiring or an excessively rich mixture.

ddd4114

What?

mavvrik

Technically its just called "detention"

Unburned end gas, over vass time, under increasing pressure and heat (from the normal progressive burning process and hot combustion chamber metals) spontaneously combusts, ignited solely by the intense heat and pressure. The remaining fuel in the end gas simply lacks sufficient octane rating to withstand this combination of heat and pressure.

This is most common when you run too high of an octane in your car over long time

ddd4114

So you're saying that higher octane gas increases the likelihood of detonation? That's a new one.

Linked

detonation is when you have buildup on you pistons like carbon.

hotspots form on the pistons and when under compression, can ignite a air/fuel mixture. the flamefront of that ignited air/fuel collides with the flamefront of the spark ignited air/fuel. those two flamefronts colliding is called detonation

boriss

i get 0420 code (this will be the.....4th time?) and its the only code i get. and it straight up breaks i hear it rattling.

i dont even drive that much..but it is inner city driving. i actually ride the bus a lot.

boriss

another thing if my car is running rich

wouldnt the spark plugs look bad? i changed them but they looked healthy