air filter noise???

[gt350dave]

hey guys, I just experienced something interesting and would like some feedback. I was just doing some reg maintenence, changed the belt, put in a K&N filter, and threw the silencer for distance. I also cleaned the TB out with some brake cleaner.
When I started it up, I 1st noticed that the engine was slightly louder, then I started noticing an intermitent thumping noise from the filter/rubber intake tract. at the same time the filter would also slightly jump. does it most after i rev it a little as the revs drop, ocasionally at idle. seemed to lessen as it warmed up. the idle is stable, rev's freely. everything is hooked up correctly w/no leaks.
What could this be?? some kind of reversion? is it normal and just hearing it because i removed the silencer and changed filter? burnt valve?
It's a 2000gt 5spd with only 38k on it and i take good care of it. i drive it hard, but don't abuse it.
I have not driven it yet, don't know if I should worry about it or not.

Thnx all

 

[sgarlic]

It's probably just the silencer being removed.. but it's hard to picture what you mean by that description.

Also.. why were you using brake cleaner in the throttle body?

 

[Kilgore Trout]

Did you remove the TB when you cleaned it? BTW, never clean it. The TB has a sludge resistant, maintenance free coating that is damaged by ANY type of spray cleaner.

Also, your MAF was already kinda dirty from being in there a while and the new K&N releasing the excess oil totally fouled it.

So get some quick drying, electrical contact cleaner and clean the MAF. Then reset your PCM. You will be good to go

 

[gt350dave]

yeah, I pulled the TB when I cleaned it, I just used a little brake cleaner (because it was handy) to break up the goo, and wiped it clean. hadn't thought about the oil from the filter going in, wonder if that was causing some funky combustion. It almost seemed like a very mild backfire. I will try the contact cleaner on the MAF. Also, what's the reason for needing to reset the PCM afterwards?
Thnx again

 

[Kilgore Trout]

It makes the computer re-learn the fuel trims (learn to smoothly idle) and the MAF is directly related to this so you get a clean MAF with nice fresh data for the computer.

Be sure to review your owner's manual for the proper procedure for letting teh car re-learn... You have to turn on the a/c while idling and driving and various stuff...

 

[gt350dave]

Good stuff, will try it out, maybe will pick up a pony or 2

 

[Kilgore Trout]

Well, when I removed the IAS and installed a K&N it was not about the power gain it was the awesome sound

Really makes the car sound a lot better

 

[whyask]

NOOB ??? How to reset the PCM ?? how long should you drive it for afterwards (sorry to jump the thread)

 

[myponyrocks]

NOOB ??? How to reset the PCM ?? how long should you drive it for afterwards (sorry to jump the thread)

Your owners manual has the proper steps, it involves a certain rpm for a certain time, then AC on for a certain time, etc...

 

[whyask]

im reading the manual and im not seeing it...sorry to bug