ok guys the other day out of no where my cobalt started making a weird ticking or hissing sound while driving especially when excellerating.i really cant pinpoint where its coming from but it sort of sounds like an exaust leak.but when i open the hood it sounds like the motor.could it have anything to do with the oil?i havent had the oil changed in a while,the display staes 30 percent oil life.

 

hey dude its 30% oil... Usually i do my oil change every 5000Km and its like 55% oil remaining so ill suggest you do your oil change and please use synthetic mobil1 hehe

 

don't listen to the above poster, it has nothing to do with your oil.\\

But this is pretty vague.... so basically, POSSIBLY your motor is making a hissing sound, but you don't know from where.... Need to get in there and take a better look around to try to pinpoint the sound.

 

if it is an exhaust leak check around your cat. if its the stock one it could be cracked it happened to mine

 

it sounds like the pass side of the car is where its coming from.

 

ya mine sounded like a small leak then one day turn it on and it sounded like i had open headers

 

same side as mee,what did it turn out to be?

 

take a rag, and stick it in the exhaust. (so that you're covering the exhaust... can use your hand, but damn, will it get dirty)

You should feel pressure build up, and it will spit the rag out when you let it go. If you don't feel pressure building up, and/or the hissing/ticking gets louder, sure sign of an exhaust leak. Simply way to very quickly find out if it's a leak or not.

 

what ever it is it is not that loud.but enough to be annoying and know its there.even my wife could hear it.now the car sounds like a piece of junk to me.

ok i tried that.the rag stayed in for a second and then flew out.

also its only noticeable when driving not when i neutral and revving.

 

are you sure it's not just the say the engine sounds? these are not queit engines by any means...

 

when you rev your engine at idle, do you hear it when the RPMs are falling around 1.5RPM?

 

pretty much when i hit the gas pedal,definately hear it more when driving.starting to sound more like some kind of exhaust leak.which sucks because the car is out of warranty.im sure if i bring it to the dealer they will charge me a whole lot of money.but with this car i am not suprised,so far the sunroof button has been fixed 3x,the rotors warped 2x,the front end sounds like a bucket of bolts is loose in there snd the dealer said everything is ok,the pass side airbag light still goes off even after the dealer assured me they fixed it.....twice.God if i didnt owe so much on this car it would be traded in.

 

how many miles? if its under 50k i think theres a emissions warranty that covers all emissions equipment.

 

52000 and change

 

Hey man was just trying to help anyway he needs to do his oil change no matter what

 

i had the hissing sound from my car, it was a cracked flex pipe, just fixed mine last month, got worse over time. I left it for a few months, it was about to fall off by the time i got to it, was very loud by then lol.

following oil changes by the oil life indicator is perfectly safe, gm spent years and THOUSANDS on developing that system.

 

That is not how much oil is remaining, it is the oil life. If it were oil remaining then that would mean these cars burn oil. No vehicle burns oil unless there is something wrong internally.

 

i understand the oil thing.unlimited how much was that fix.i think it may be an exhaust leak somewhere.

 

if its the flex pipe you need a new downpipe. You can get an aftermarket one from one of the vendors here and an exhuast shop would only charge like $50-$70 to put it in.


Mine was the same issue, hissed when accelerating, pretty much normal at idle.


Take it to an exhuast place, mine found the leak in 10 seconds of going under the car with a little hearing tool.

 

i was just checking zzp.they have a nice one for 139.00 with cat.

is the cracking downpipe a common problem?

 

emissions warranties are for 8 years 80,000 miles

and in 07 werent all cars 5/100K?? take it in and have them check it out under warranty, its shouldnt cost anything to get it checked. then update us.

 

yeah,i just looked it up and the whole exhaust is covered.i will have to go to the dealership.

 

mine was in an accident just before i was going to fix mine so insurance covered it. Though i ordered an LSJ downpipe for a small upgrade instead of the stock one. Fairly big difference between the lsj downpipe and the le5 downpipe.

 

whats the lsj down pipe?how much?i was thinking of just springing for the zzp down pipe.will i have fitment problems with stock header?

 

no i beleive the zzp bolts up. The lsj downpipe is the downpipe from the 2.0 supercharged cobalts. Good size bigger then the LE5 downpipe but aftermarket will flow better. Also will be louder, more raspy is what i was told.