CAI Problem, CAI Options

[fenderdave]

Hey,
Last night I finally did my first MOD on my 7AFE, (CAI) fitted the pipe, has a whole for the temp sensor, and one for a breather tube, but I closed this off as i had no where to put a breather tube.
My issue is that when i first start the car it makes a lot of noise like you can hear it sucking up the air and the rev's are about 600 higher than normal, then once the engine heats up it stops making the noise at the rev's drop back down.

I'm guessing this isn't normal? anyone got any ideas why its doing it?

thanks in advance.

[SupraKid]

The intake noise at start up is normal, but the idling high sounds like you have a vac leak. on usdm spec 7afes there is just the temp sensor that when into the intake box originally.

I would look for a vacuum line that isnt connected and either try to figure out where it went, or plug it up.

This post has been edited by SupraKid: Sep 15, 2010 - 7:06 PM

[HectortheRican]

The intake noise at start up is normal, but the idling high sounds like you have a vac leak. on usdm spec 7afes there is just the temp sensor that when into the intake box originally.

I would look for a vacuum line that isnt connected and either try to figure out where it went, or plug it up.

It's not a temp sensor. The only thing that goes into the intake tubes for 7AFE's is the MAP sensor. Trust me, I've got one lol

[mkernz22]

there should have been a Vac line that attached to the stock intake rubber on the hose. That should connect to the spot that you plugged up.

[fenderdave]

there should have been a Vac line that attached to the stock intake rubber on the hose. That should connect to the spot that you plugged up.

There were no lines coming off the Stock intake, I was under the impression not all Celica's had them. Mine just had the sensor going into the actual airbox and a resornator box on the back of the hose right by the engine intake.

would the Vac leak be closing itself up once the engine heats up and things start to expand? maybe i just need to try and tighten all the seals (just trying to figure out why the rev's return to normal once it gets to temperature)

[mgnt232]

[quote name='fenderdave' date='Sep 16, 2010 - 5:56 AM' post='875625']
[quote name='mkernz22' post='875553' date='Sep 15, 2010 - 9:02 PM']there should have been a Vac line that attached to the stock intake rubber on the hose. That should connect to the spot that you plugged up

I dont thing I have the vac line on mine? or at least I havent seen it? Just the sensor (whatever it is). And with a CAI its supposed to be louder. thats like its main job lol. No real power gains on our 7A's. But it makes it sound 150% better

[mkernz22]

ohh, then maybe that's just with the 5s then...

[HectortheRican]

Yeaaah. If I had a vac line, it's invisible lol. Only thing I've got going in there is the MAP sensor

[fenderdave]

I've just tightened all the clamps, checked everything, there's definitely no leaks, but its making a hell of a lot of noise (not in a good way) when i first start it up and still idles higher than it should/was. kind of like a sucking/hissing sound, from looking at it the induction kit seemed to be shaking around a lot as well. if im accelerating the noise goes away, but if im just cruising or stationary it comes back until the engines up to temp.

Is this normal? I'm far from an expert with engines but it just doesn't seem right to me. and doesn't sound good at all.

ONce the engines up to temp it sounds great and the rev's drop back down when idling.

Any thoughts, comments advice would be greatly appreciated

[SleekCelica]

Well then, that just sounds like normal warm up. The sucking noise you hear is you IAC allowing more air to bypass the Throttle Body, allowing for a quicker warmup, thus a higher idle. When it's warmed up to the computer's specifications, the IAC closes most of the way (sucking noise dissapears) and the RPM drops to normal idle. You are just hearing it more because, when you had the stock air system on, it has mufflers and resonators built into it to muffle those sounds.

[fenderdave]

Well then, that just sounds like normal warm up. The sucking noise you hear is you IAC allowing more air to bypass the Throttle Body, allowing for a quicker warmup, thus a higher idle. When it's warmed up to the computer's specifications, the IAC closes most of the way (sucking noise dissapears) and the RPM drops to normal idle. You are just hearing it more because, when you had the stock air system on, it has mufflers and resonators built into it to muffle those sounds.

thanks, I knew someone would know exactly what was going on, hoped it was something logical like that, I just hate the thought that I might be causing damage to my beloved 6gc, so thought i better get some advice

[SleekCelica]

Nope! All is good