Hi everyone,

I posted this in the general section but figured i'd probably get better responses in here...

I have a '04 Coupe 6MT and it's always had a slight "pulse" while sitting at idle. At first I thought it was my engine but when I parked it in my garage, I noticed that the sound was coming from the exhaust. Also, my exhaust has more soot inside the tips than other Gs I've seen.

Now my first thought was that spark plugs need to be changed (which they did) so I changed them. At the same time, I also installed a 5/16 MD Spacer and reset the ECU. Well my car seemed to idle great when I first changed plugs and installed the spacer but now after about 2 weeks later, the exhaust noise is back and worse than before...

I've been reading and it seems like there's some unburnt gasoline getting through to the exhaust? Also maybe my car is running rich? My car is completely stock other than the Spacer.

Any help is much appreciated. Thanks. BTW, the car has 54k miles on it.
Edit/Delete Message

 

hmm if theres unburnt gas in your exhaust wouldnt you be shooting a little bit of flames on when you get on it? Go get on a dyno and check your afr's.

 

Yeah there is no way to tell if you're running rich or lean without knowing your A/F. Go to a dyno or go buy a gauge.

IMO I think you're fine, our cars sound sweet at idle stock

 

And water often comes out of the exhaust when you start it up in the morning.

Water is a product of combustion.

 

why don't you drill a hole in the exhaust pipe and put a spark plug in there and get your self an afterburner.

 

Thanks for the suggestion. I think I will go get it checked out on a dyno as that's probably the first thing to check.