Hi Guys,

I've done some searching through the forums and have found some people with similar problems, but not quite the same. Any thoughts/ideas/suggestions would be welcome.

I've got a 2004 G35X Automatic that has right at 50K miles on it. It's developed a tapping sound on a cold startup that only seems to last for 15-30 seconds. It's audible from inside and outside the car and appears to be coming from the passenger side of the engine bay. It seems to happen at 1150-1250 RPMs while in Park or 750-850 RPMs while in gear. Any higher or lower and the noise goes away completely. Once the car is warmed up the noise is no longer present even when holding the RPMs in the suspect range.

It didn't always have this noise which is why it bothers me. I only use Mobile 1 5w-30 and K&N/Mobile 1 oil filters. The oil is changed regularly as well. The car drives fine, has no weird smells, no warning lights, or any signs of fluid leakage. It does burn a small amount of oil, but not near as much as those with a true consumption problem.

 

Fuel Injectors. Mine does it, they are loud as crap. Dont sweat it unless the tapping sounds seriously loud like a knock or a ping.

 

Mine does that, but it's like a fluttery noise at idle and it gets louder at 2k RPM's and is always present. I'm trying to find out exactly what it is with no luck.

 

I have the sane thing too. It's only cold start and at lower rpms like less than 1500 when in drive. On regular starts tho its not there at all