i just installed my aem cai today and i let the car run for about 10 minutes and it was fine but just a little after it started knocking. is this normal with the new intake, is it just the valves i hear through the intake? i double checked all of the connections and everything is tight. any help.....btw it is a 06 tc.


thanks
shane

 

It's normal.

 

Be more specific on the knock if possible. It is probably just noises you did not notice before the intake was put on. Some common things to know about a knocking sound:

1) Is it a deep knock, a "tick" or a "tap"?
2) Is it in time with the engine rpm (changes with rpm)?(crank)
3) Does it sound to be half engine speed? (Cam)

You will probably notice a couple more clicking and ticking sounds with the intake, and possibly more valvetrain noise that was muffled before. But the questions above can help at least get an idea of what it could or could not be.

 

1. more of a tap
2. goes away when you rev the engine...only taps at idle
3. ? not sure

 

After installing my intake my engine was running extremely rich and after I leaned it a little bit it went away.

 

^^ How did you "lean" it? There is no way to without remapping the ECU. The only way it would have run extremely rich was if you messed up the MAF when installing the intake. So the only fix would be to replace the MAF.

As far jpauls, that sounds more like the vacuum switching valve or just some normal valvetrain noise. I would not worry about it unless what you are hearing it get worse and worse.

 

Power Enterprise Camcon VVTI controller and Air flow controller. The MAF isn't damaged it just ran rich in the high rpm range due to more air in the engine.

 

More air in the engine means the ECU adds more fuel. This does not make it run more rich. It makes it run as close to stoich. (14.7:1) as possible. Once the car runs for a short while the system will compensate. There was nothing wrong with the car that needed fixing unless something was installed incorrectly or the maf was damaged. Adding an intake adds little to no power after this occurs and will not cause the engine to run rich. The only way it will run rich is if their is less air coming in than the MAF "Sees", so the ECU adds too much fuel.

 

I have been a mechanic for 8 years I know how engines and ecu's work. And my engine was running rich enough to make my fuel break up. I have had it on the dyno and used a wideband and since the intake at high rpms It runs around 11.7-1. So yes rich! Until the Camcon and I leaned it out a little to the 13-1 range.

 

Then you have an install issue or a damaged component. The intake would not do that. Sorry you dont like my info, but it is the truth. An intake does almost ziltch for power (which, if you have the experience you say you will know) or anything else for that matter, and it will not effect this system enough to be out of range of the MAF and ECU's parameters, meaning it will easilly compensate. You have something else going on there. I would reccomend disconnecting the CamCon and getting the car to run right again, then reconnecting and tuning the camcon. That way you are actually addressing the real issue and not just tuning around it. Not trying to battle with you, just posting some info.

 

If you look I don't just have and intake like you are making it out to seem. My engine has a full intake and exhaust and header. So with combination of these mods it does cause your engine and ecu to respond diffrent. IF you don't believe me come to sc and we will go the the dyno and I will prove it to you with the dyno and the wideband sensor.

 

I am not saying it is not running that way.. I am saying that your IHE did not make the car run pig rich to the point it would not run correctly.

 

It still runs fine just around 5000-redline without the camcon the fuel starts breaking up some. You can hear it in the engine but when I subtracted 3-5% between 5000-redline my fuel went around 13-1 and you didn't hear the fuel breaking up anymore. Thats all I was saying. A stock tc with just and intake will not do that but if you have other mods in combination it can start running slightly rich compared to stock. Stock at wot will run about high 12's-1 or low 13's-1.

 

I just installed my AEM CAI and I have the same issue, it ran smooth like stock when I first started and after a couple of minutes, it started knocking (ticking sound), sometimes fast sometimes slow. But if you rev it to 1K+ it goes away. The sound comes from the driver side, it looks like its coming from MAF sensor area but i'm not sure, just wondering if this happens also with other CAI.

 

the ticking sound comes from the Vaccum switch valve.. the ticking is normal and has been there even before the CAI.. i think the metal tube and the metal bracing it is mounted to tends to amplify the sound.. not like the stock where it is mounted in rubber.. try putting some rubber between them.. i did that and significantly reduced the ticking sound..

 

Ok so I noticed this today after I reved my engine a couple of times and warmed up the engine. You said something about the vaccum switch valve. Its a ticking noise and yes it was coming from that area. What is going on exactly? Thank God its normal though!

 

omg, i thought i installed it wrong. Thanks for the quick answer.

 

not quite sure bout it's actual function... but definitely heard it even with the stock intake.. i remember reading a thread here before with this ticking sound.. and someone said..

here's the thread..
https://www.scionlife.com/forums/vie...108180&start=0