My car is hissing while accelerating around 2000rpms and I have seen other people have had the same problem. Four of my o2 sensors are bad and I'd like to figure out the problem before I replace them. I have a cai and checked and rechecked the hoses

 

Hissing and 4 bad 02s? Unless you've recently run some leaded race gas through there it's likely another problem.

You may want to check for exhaust leaks which would cause hissing and bad 02 readings.

 

It's ur cold air intake. Most people with intakes especially the AEM V2 have hissing during acceleration. I have it but don't mind.

 

I have a fugita on it. It's not the exhaust, I just changed the exhaust from the cat back and it was doing it before. I believe it was doing it before I put the intake on it

 

its the intake....i luv the hiss actually....hiss FTW !!!

btw once when i was in 2nd gear and floored her....shifter to 3rd at ~6400 rpm.....damn the AEM intake made it sound like a friggin blow off value

my ex girls brother, who was in my car, was like OMG OMG !!!

 

Exhaust doesn't mean catback. Lift your car up and inspect for a leak from the heads / primaries to the catback. I've had very thin cracks form on my headers from a previous vehicle and the cracks weren't visual so check for the leak while the car is running. Pay close attention to the exhaust connections. Also check the IM, listen for leaks around the IM cover. You can also swab it with a soapy solution to detect a leak.

I would usually agree that it's just the CAI but you have 4 bad o2 sensors.. that doesn't make any sense. Take IHC's advice before dropping some money on new o2 sensors.

 

When tracking down noises, use a 3-foot length of rubber tubing/hose. Even a 3-foot section of water hose (garden water hose) would be great.

Place the hose near your ear. And with the other end, move the hose around listening for "that sound" that you are tracking down.

This trick works for any sorta of sounds, such as exhaust leaks, ticking sounds, etc. The beauty is that the hose will isolate the exact position of the sound. With the un-aided human ear, you can be easily fouled with pinpointing even the general location of the sound.

One bit of warning. Because you will be poking around a running engine , please be careful of moving parts and hot parts. It is very easy to be distracted with playing with the hose, moving it around tracking down the sound, that you become distracted of the hazards.

 

Just don't use a graphite hose.. a buddy of mine was checking for leak and he touched a live wire.. The result of this action was hilarious.