Hi Guys,

Since nearly 2 weeks, I've got my Idle who doesn't sound like it was before.
This happens a week after changing my Catalyser for a Magnaflow DirectFit Catalyser.
I was suspecting an ignition issue, so I've change the sparkplug, spark wired, the 3 Coils and the ICM.

Still having the sound of an old V8 car.

Car is starting perfectly and there is no hesitation when I accelerate. When driving engine is ok, no shaking, nothing. Oil pressure is stable no strange noise and lost of performance.
The car doesn't eat cooling liquid or Oil, level are still the same.

At idle RPM is stable 750rpm all the time, just the sound is different.

I've post some video of my idle on youtube:



What do you think? Some help will be appreciate. It's hard here to find a good shop to do a good diag on American cars (3 year ago I've got a bad coil and the shop charge me 1300 dollars to change sparkplugs, Coils and wired)

Thanks a lot

 

Sounds as if it has a cam in it, but you never mentioned if it did so i'll just assume it doesnt. So it only started doing this after you installed the catalytic converter and exhaust? When did the idle start sounding like this? Does it have the "Service Engine Soon" light? if so have you gotten it scanned for codes? be sure to clean your Idle Air Control valve and your MAF sensor. Use carb cleaner to clean out the throttle body and make sure you have no vacuum leaks

 

I haven't check the IAC. I will have a look. I have no "SES". All Electronic connector visible have been checked
I was supecting the EGR not closing correctly at Idle.

 

If it was the EGR it probably would have signaled the computer and thrown a light, keep us updated, ill be glad to help

 

make sure the knock sensor is plugged in and the wires are ok.

 

Gee, sounds ok to me. Is it possible the idle was like that before, only now the free-flow exhaust is making it more evident because you can hear the lumps?

 

Ya sounds fine to me. Increase your idle rpm a little and your loopy idle will go away.

 

Im telling you, I think someone cammed it and didnt tell you about it

 

^ But if it wasn't cammed, he better find out what's making it sound like that and share it with the rest of the V6 owners, so they can add that sound-effect to theirs!!

 

Hahaha, I remember mine sounded cammed because it was misfiring, I was like "awww, better fix it I guess "