I've had the same thing in a Prelude and my girlfriend's c230 kompressor coupe... I was told by several different people that it's the abs?

 

The story is the plant in Lordstown Ohio which builds the Chevy Cobalt is haunted by the ghost of John Delorean. Delorean never forgave GM for sacking him from his job as General Manager of the Chevrolet division, and now haunts the facility placing squeaks, rattles, pops and other noises into the Cobalts as they roll off the end of the line.

MY Advice to to hang some garlic, fuzzy dice or other mojo from your rear view mirror, and always remember to walk BACKWARDS WITH EYES CLOSED around your car three times, chanting "Long live the DMC" before using the key or remote to unlock the doors.

Works for me!!
WopOnTour

 

Just had my first experience this a.m. Waiting at a stopsign and it was loud as hell! Knock, knock, knock! Sounded like someone was knocking hard on my window! It was from the rear somewhere. Kinda funny! Just strange. I've heard the car/abs/or whatever sometimes after its shut off, but this one was really loud. As long as its a friendly ghost!

 

OK I have had this happen a few times. How many of you have the recaro's? As stupid as it may sound, I swear atleast 5 times it sounded like someone was knocking on my window but behind me. I lean forward in my seat and then lean back and forward again and the sound happends again, I finally realized this is from my seat. Its only when your in certain positions and its wiered to hear your seat make that noise, but for those of you who have had this happen with your car off this may be the cause. It so sounds like a tap on glass, but it someone comes from my seat depending on how I lean back in it.

 

happened to me one morning, scared the **** outta me!!!

 

I have the base model coupe so it is no way that it could be the abs so i think it has to be the latch or something.

 

it should b the GAS CAP
it happens 2-3mins after the car starts... fuel pressure builds up and locks the GAS CAP

 

I had it happen to me in a drive thru too. Scared the crap out of me I thought someone was knocking on the passenger rear side of my Cobalt but no one was there. F R E A K Y !!!

 

i have had it happen to me as well, i dont like it, dont care if it is the abs. someone please post a fix as soon as you know the problem for sure

 

For the answer to the "noise", refer to "Knock, Knock,Knock" thread and view posts; 20, 24, 31 and 37. You are not going to fix anything.

 

change the stock muffler it will go away

 

wow this is crazy ive never had it happen though

 

happens in my base model all the time, I've come to accept it and live with the ghost of cobalt past peacefully

 

all of our sport cars does this!

 

LOL i have the same thing, i kind of figured it was a loose antenna because it kind of sounds like my antenna is rattling, but its never loose.. good to know im not the only one who notices this

 

That happened to me today for the first time and i've had the car for a year now! It scared the hell out of me

 

Humh. I noticed the other day when I start the car, I hear a "clicking" or "taping" noise from what sounds like the back of the car, maybe the trunk area. I am not sure whether it just started, or I never noticed it the last two weeks.

Anyhow, I don't think it is the exhust poping. I know what that is like when it is warm. It is more of a "ping" like throwing a coin into a coffee can. Best way I could describe my noise at startup is like something loose shaking. I guess it is almost like someone tapping on the trunk or something. I though maybe those crappy clips holding the exhuast were loose, but everything looks tied down!

So maybe it is what NJBLUESS says? I have no clue about what he is describing, other than the fact that it is related to engine mangement and emission sensors. The engine fires fine, and like no less than one second after it is running, I hear this "clicking" noise from the rear. I'll have to watch and see if it does it on an empty tank or a full one!

All these new car sounds and smells worry me too much! I need to relax more!

 

I've got that same damn thing! I can't figure out what it is either!

 

For me, it's not so much a click, but more like someone is physically knocking on the body panel and it always goes in threes. However, the fuel pump idea sounds good to me b/c it's always when I've been driving for short distances, never after I've been warmed up for a while.

 

well...i had this happen for the first time tonight.....when i got home i stayed outside to have a smoke and i heard the ghost knocking......it does sound like a muffler thing to me tho.....which doesnt make sense because i drove home like a grandma tonight.....shitloada cops

 

I actually got that noise too while i was in a drive thru I looked back and nobody was there. Then when I got to work While I was getting out I heard it again and it was my antenna. It wasnt screwed down all the way and when it was swaying the base of it was knocking against the car.

 

The nock, nock, nock is your gas tank checking itself for fuel pressure. Our superchargers aren't all that great when it comes to building pressure. You know how you turn your key to the 2nd aux. for a couple of seconds before starting your SS/SC? It's to build fuel pressure. The knock is just your tank checking fuel pressure. It only happens when you first start your car, just turn it off or idle for a while. Fuel pressure is key in the SS/SC. Hope that helps. It is the truth.

 

My neighbors malibu did this yesterday, scared the **** outta me. She looked at me like I did it to her car...then we both laughed and I went back to washing my car.

 

Please research for information you just described. NO GM vehicle tests or monitors fuel pressure within its engine managment system.It has nothing to do with the supercharger, either. I have explained this before, IT is the EVAP system testing itself!! The vent soliniod is the cause of the tap, tap, tap noise! The noise is as if someone knocked 3 times in the trunk of you car. If no one believes this, stop in my shop and I will demonstrate the noise (with a Tech 2 you can command the soliniod on and off and hear the noise inside the car)
Now, as far as you stating that your assumsion is truth, please feel free to explain. Also, I would like to add that, Engine Performance, Emissions and Elecrtonics is my specialty in my field, So, I am always looking to learn something new!

 

You mean it's NOT DeLorean's ghost?? Damn EONV tests!
Wop