Originally Posted by
snpiee
Hello folks,
I am a new Crossfire fan and owner
- got my crossfire about 3 months ago. Its a 2004 Limited Coupe with 115k on it. Love the drive and the look of the car, pretty much everything except some minor annoyances of which some are understandable at this mileage (some cabin rattling noises, around dash, side and rear gate windows, also wind noise between door window and roof, and fogging headlight).
Anyways, my major problem is the knocking sounds that can be heard at low engine speeds. The sound decreases as rpm's increase and disappears completely at around 800 rpm. Its very hard to pinpoint where its coming from, maybe a little louder under the car. Also, sometimes after driving, especially aggressively, it would go away even when stopped, at the light for example, where it idles at those low rpms. I just changed the oil, thinking maybe the previous owner put something wrong in there. I used 0W-40 Mobil-1 and Mann fleece filter. One thing I want to note is that the valve covers are leaking some oil - bad gaskets?
If only there was a way to raise the idle speed I will never hear the annoying knocking
but with today's electronic throttle bodies I don't know how it can be done unless programming the ECU.
Regards
Welcome and sounds like a couple things can be done to get rid of the minor annoyances.
WRT the rattle, at least the hatch rattle. I can be adjusted at the latch and it will cure that nasty noise. There is a thread on here with a couple ways to fix it.
WRT the windows / air noises. Yup, especially in crosswinds. An easy fix is turn up the stereo. Other things that may help are: new weather stripping, window adjustments, treat the old weather strippings to soften them up.
The knocking noise you hear may be something different than what is commonly heard / referred to as knocking at low idle by most folks, but it it is the common noise, it's the fuel injectors. They all do it, some more so than others. I don't usually hear mine unless the hood is open / and or I'm outside the car though. If you here it inside the car, it could be something else. May want to see if fuel injector system cleaning may quiet it down. I have a lot less miles on my 04 than yours too, so it could be something else.
The head gaskets do leak and the simple fix is, replace them. Not expensive or to time consuming if you do them yourself.
Good luck and post us as your ownership continues.