tmab1234

I bought my 99 Infiniti I30 with 176000 miles on it. I now have 192000 miles and it runs great but when I am sitting at a light I am feeling a very big vibration and a clunk on acceleration. I replaced the front side and transmission mounts and it got a little better and the only other thing I can think of is the rear mount but when I lift the car and look at it I cant even see any signs of wear on it so I am hesitant to replace it. It looks brand new still. Could it be something with my transmission?


Also I have replaced my the rear valve over gasket 3 times and the front one twice and they still leak. Is it common for the actual valve cover to be bad or should I try the gasket again with a higher quality gasket?

Infi30t

Well it looks like you've replaced/checked everything I was going to mention when I started reading... Do you have a trusted mechanic you can take it to and have them do a once over and check other mounts and possibly spray some degreaser and find exactly where the leak is coming from? Where are you located?

tmab1234

I am a mechanic myself and I can definitely tell its coming from the valve covers its the highest point of oil saturation. I bought a felpro set of gaskets and I am gonna try that. I know I have a lot more places its leaking oil from but I just need it to stop leaking on to my alternator cause I have gone through three since I bought the car from the oil leaking on it. I don't mind the other leaks. It doesn't even go below the dipstick between oil changes. I have heard the vibrations could be ignition coils. I was paying more attention to it and it seems the vibrations only happen when everything is very hot but when I first start it up in the morning it seems fine idk what that would mean other than the heat might have something to do with transmission or the resistance in the coils maybe??? I have done the drain and refill of the transmission fluid about 20000 miles ago just for maintenance sake. I am wondering if it would help to do a full on trans filter service.