bazooka

hey guys, got another problem with the car now -_-

the car is a 05 50k miles. i bought it used at 46k miles. only mods are pully kit, rev8 catback.

soo i was driving home about an hr ago and the car started to backfire when i would let off the gas in 6th gear going 70mph. when i exited the freeway and stopped at the light it stalled. i started it up again and the idle would pulse between 200-400rmps. idled and sounded like it was ported.

if i held it in first gear at 4k rpms it would stutter and backfire. when i got home it smelled like *** and the idle was pulsing between stall and maybe 300?

I have NO idea whats wrong with it. engine seemed a little hot for a 15 mile drive home.

I dont know if the plugs, coils, wires were changed yet.

It smells like i have no cat.

any help would be great.


oh and i went upstairs to look through the search then went down started the car and it was idling fine.

so any input would be helpful. thanks

jDt!

iTrader: (2)

Sounds like your cat went bye bye. Seems a little bit early for it, but things like that happen.

bazooka

boo... my o2 sensors went out last week and i replaced the rear o2. i still need to replace the front o2 n now my cats done -_- fml lol

Jon316G

iTrader: (1)

50K on the original cat... its a likely suspect.
You might have changed out the rear O2 sensor when it was perfectly fine and doing its job telling you there was something wrong with the cat.
Also, poor ignition can contribute to decreased cat life.
If you don't know when these were last changed out, you might want to consider it.

bazooka

well i changed out the rear o2 because i got a heatercore failure on the o2. after i replaced that one the front one went out also. i already have the front o2 in just gotta put it in on monday. im gonna take it for a drive now to see how she acts

TQCuong3th

iTrader: (1)

i think you right and have the same problem my 8 get super hot in 15 min 20 min drive and it would die on me then i just wait until like 10 min then i can start it again when i look under i can see hot air blowing out under the car where the passerger seat is at, so what do u think should i do

chino0314

iTrader: (12)

get a midpipe

TQCuong3th

iTrader: (1)

u positive? and i think i should clean ou my engine caus ei had AEM cold air intake and it seem like it have water mixed in there so should i get new oil change or clean the engine???

chino0314

iTrader: (12)

no but it sounds like your cat is clogged

TQCuong3th

iTrader: (1)

ohh can i have them check out first?or how can i check it myself?

Red Rex

iTrader: (1)

Possible bad ignition component that damaged your cat.

TQCuong3th

iTrader: (1)

i just changed new ignition coil, cleaned my throttle body the run run alot better but it shake at idle and it get hot really quick and die on me when it get hot

Bluerenesis

OEM Cat is expensive so you might as well go with a midpipe with hi flow cat maybe through BHR or Racing BEAT. I dont know if you have emmission testing at your location so a straight midpipe would fail you. If you dont than do with the suggestions above but a straight midpipe without a cat or resonator is obnoxious sounding.

bazooka

hmm well my car doesn't die on me. idle is somewhat normal. still dipping every so often. if I gun it then it will idle normally then go back to a ported like idle and backfire like a ****. how many people think its the cat failing? lol and does mazda warrenty the cat if anyone knows


thanks

Bluerenesis

I am pretty sure the CAT is under warranty now that I think about it.

Old Rotor

Yes the CAT has a 8yr or 80K warranty.

bazooka

awesome so how do we know that the cat is bad in order to take it to the dealership to get it replaced

TQCuong3th

iTrader: (1)

really it under warranty that would be awsome and yea how do we know ???????????????????/

Bluerenesis

unless you take it apart, you probably will have a tough time figuring out its bad. If you trust a Mazda mechanic, than have them take a look.

TQCuong3th

iTrader: (1)

they would charge u 150 first lol that wat they do here crazy what is emmission testing??

Bluerenesis

you must not have emmissions testing if you dont know. Some places require you to go once a year or every two years to get a smog check.

TQCuong3th

iTrader: (1)

what the hell wat is smog check how much would these thing cost anyway all i know i can see a hot air blowing out somewhere next to the passenger eat

Bluerenesis

emission testing isnt done everywhere but usually major or large cities. It is for the city to make sure that your car is within the limit of how much Carbon Dioxide its emmiting into the air. Around here in Idaho, its only $12.00 every two years but I think it went up more. Not a big deal but w/o a CAT, you would fail the smog test and possibly lose your registation if you didnt fix the problem within a time frame. Also if you do decide to go midpipe, I recommend you find someone in here with a midpipe around your location to let you here it in person. I made the mistake of not learning about what kind of sound output a high flow CAT makes before I purchased one and ended up taking it off after a couple of weeks. I imagine that a midpipe would be even louder w/o a CAT.

TQCuong3th

iTrader: (1)

lol really thank man well my car get hot after 15 mine driving and it sake when stop but when i idle it shake less then when it on Driving when the heat flowing feel very hot what do u think is wrong

Bluerenesis

so is the guage in your car showing high oil temperature? have you looked at your CAT for color change? and seen exactly where the hot air that you were speaking about was coming from?