When i start my car i heard a small popping sound, i have put my ear against my intake and it sounds like its coming from the intake itself, I believe its my intake valve? Any ideas other than that? Anybody else having that problem?
Well Scott Smith, Do you have a after market CAI? If so they do make a little noise due to more air flow beening allowed to flow into the throttle body quicker.
spark knock?
ABS?
<img src="http://geocities.com/jimmythekid1/gecat2.gif">
I would bet money it is the intake valve.
FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!
ummm, excuse my ignorance... Intake valve? I don't believe any such device exists, in fact unless it's an AEM bypass valve I'm pretty confident. The throttle body is a kind of valve, but it's not an intake valve.
If it is an aftermarket intake your going to hear more noise because you've got a metal tube that resonates instead of absorbing all the noises your engine makes now.
-Chris
IamRascal wrote:ummm, excuse my ignorance... Intake valve? I don't believe any such device exists, in fact unless it's an AEM bypass valve I'm pretty confident. The throttle body is a kind of valve, but it's not an intake valve.
If it is an aftermarket intake your going to hear more noise because you've got a metal tube that resonates instead of absorbing all the noises your engine makes now.
lol? No such thing as an intake valve
I guess thats why they sell them at Auto Zone
IamRascal wrote:ummm, excuse my ignorance... Intake valve? I don't believe any such device exists, in fact unless it's an AEM bypass valve I'm pretty confident. The throttle body is a kind of valve, but it's not an intake valve.
If it is an aftermarket intake your going to hear more noise because you've got a metal tube that resonates instead of absorbing all the noises your engine makes now.
Umm, I don't know how to write this without sounding like a slam, so don't take offense, I don't mean any.
The intake valve is opened and closed by the cam to allow air into a cylinder. Then it closes, the spark plug lights the gas/air mixture, and pushes the piston down. After that, the exhaust valve is opened by the cam, the piston moves up and exhaust is pushed out to the exhaust manifold (or header). This happens for all 4 cylinders.
So if an intake valve was sticking open, when the spark plug ignites the gas/air mixture it would make a popping sound through the intake manifold from the expanding gas/air coming through. If an intake valve was chipped or cracked, it would make this sound all the time.
John Wilken
2002 Cavalier
2.2 Vin code 4
Auto
Okay part of the reason I sometimes hate this site is like the above poster, who says there is no intake valve. Your most likely one of those morons who opens their owners manual and sees 7500 miles between oil changes but doesnt bother to read thats for highway driven cars only and not for city.
The above poster posted a pretty good explanation, but the crankshaft is what moves the piston up and down, the camshaft just opens the valves and closes them.
Okay this popping can be caused by a ton of the things. For one thing loose spark plugs can cause this popping. Yes I have seen cars come in the shop with a popping sound, turns out when thier buddy did a tune up for them he didnt tighten the spark plugs down.
Next you should do a cylinder leak down test to see if the intake valve is leaking. I'm guessing you dont this handy tool. But what it does ( car off by the way) when the cylinder being tested is at #1 TDC compression stroke, when both valves are closed
it forces compressed air through into the cylinder, if you hear air coming from the tailpipe your exhaust valve is shot, from the air intake your intae valve is shot, from the oil filler hole your piston rings and the radiator spills over cracked head or bad head gasket. Anyways without actually hearing this popping I cant say if it your intake valve, I can sit here from a few hundred miles and give advice but thats about it. I would bring it to a shop if your unable to diagnose it yourself.
- 2004 Cavalier - 124k, owned since new
Rob S wrote:The above poster posted a pretty good explanation, but the crankshaft is what moves the piston up and down, the camshaft just opens the valves and closes them.
If you read my post again, I did clearly state that the cam opens and closes the valves, I didn't want to confuse someone who admittedly wasn't sure of what an intake valve is by discussing other engine components.
I disagree with your position that IamRascal is a moron who skimmed the owners manual and think they know everything. My opinion is that this forum is more for those who don't have knowledge to communicate with those who may. Most of my engine experience has been with pre-emissions v8's, so I am pretty confident with working on the physical components, but I am the first to ask and listen closely when it comes to working with the electronics in fuel injected engines. And yes, I have asked what others may consider very basic questions, and probably will again. But isn't that what this forum is for?
John Wilken
2002 Cavalier
2.2 Vin code 4
Auto
Hold on here a second. I dont mind people posting any legitment questions or asking for help. I really hate people like the guy above who says there is no intake valve, I really get sick of people posting stuff they have no clue about. Then the person asking for help follows what some moron told them to and messes up their car even more.
I'm also sick of this type of BS
" my headlights dont work"
response.....
"replace the switch it might be bad, replace this and that.
How about telling the guy to test the damn components first and then replace the bad part. You can spend money for a switch and replace it and have that not be the bad part, which could have been avoided if someone would have told the guy to test the switch first.
I'll admit I'm not to good with driveability issues and trans questions, but you have an eletricons questions or a sensor question I most likely will know the answer and will be able to help diagnose any eletrical problems.
- 2004 Cavalier - 124k, owned since new
Rob S wrote:Hold on here a second. I dont mind people posting any legitment questions or asking for help. I really hate people like the guy above who says there is no intake valve, I really get sick of people posting stuff they have no clue about. Then the person asking for help follows what some moron told them to and messes up their car even more.
Calm down a bit there. When you someone says intake I think before the intake manifold. Your talking about the intake valve in the actual head of the car. And it's not just one damn valve.
"I believe it's my intake Valve?"
not
"It sounds like a valve is sticking"
or
"I think of of my intake valves is sticking."
There is no singular valve, so excuse my ignorance for reading what was written and interpreting that the individual in question may not be knowledable and think that the throttle body was making a popping noise and calling it the intake valve as opposed to addressing the possibility that one of the air inlet valves was sticking.
Just settle down a bit there. I didn't give him a stupid solution to further break his car, I merely stated my opinion on what he said in persuit of further clarification. Then stated based on my knowledge of aftermarket intakes that you will hear the engine more and more than likely it has always made that noise, your just going to hear it now. So sit down, take a chill pill and don't get PO'd at something this small.
John Wilkens 1st addressed my lack of knowledge simply and to the point, then confirmed that a sticking valve would possibly make a popping noise.
You provided the answer of how to check, thread closed, done complete. No slander is needed. If you read some of my other posts you'd realize that I know a decent amount to fix most of the issues that affect my car, and on a second not I change my oil every 5000 miles with mobile 1 synthetic in my own driveway and have never had an engine issue with my car in the 50K+ miles since I purchased it with only 3 miles on the clock.
-Chris
Rob S You hate when someone gives run around information on a problem. Your example was "I'm also sick of this type of BS
'my headlights dont work'
response.....
'replace the switch it might be bad, replace this and that.'"
But yet you do the same thing. EX from your November 11 post in the Maintenance forum "Okay first off it blinks twice as fast because there is less resistance in the back, less resistance = more current flow, to decrease resistance its the exact oppisite add some sort of resistance, like a light bulb.
Anyways you said the light works so it just doesnt blink. Well the light works, so we know the fuse is good, we also know you have a complete circuit, so you have power and ground, also by it working we know the contacts are good.
See the blinkers usually operate by the switch, opening and closing, open and closing, completeing the circuit, then breaking it, then connecting again. So I would test the switch, let me know what you find out." The problem ended up being the bulb since it is a two filament bulb.
Before you start knocking on people, get your facts right. YOU ARE NOT RIGHT ALL THE TIME EITHER!!! No one on this org knows all. You must learn to be more tolerant of people helping others. Stop whining about what other people write. They are just trying to help.
98 Z24
RIP Specks
Um, yeah ok. Why all the hate when a poor guy just asked why his car sounds like its makeing pop corn when he starts it up. I have a feeling this is gonna be something little and something stupid. Unfortunatly I have No idae what could be makeing this sound so I won't start guessing. Without hearing this noise in person its damn near impossible to say what it is. All we can do is ask what else is the car doing? Did you do something before you noticed it popping or did it start all at once. I'll try to help but I need a little more info or I'll just stay quiet.
Now you kids play nice and no name calling or I'm telling mom!!
Semper Fi SAINT. May you rest in peace.
