i just switched over to mobil 1 synthetic @ 7000miles and my car is knocking!!! do any of you know why its doing this???

 

Are you using premium gas?

 

Def. not the oil.

 

ya i didnt think so but i noticed it right after i changed the oil...maybe because i was paying more attention to see if the car was acting funny after changing the oil...knocking usually has to do with the timing right? i havent messed with my z at all...just put in my popcharger about 4000 miles ago

 

Might want to clean your pop charger, or it could be bad gas!

 

im gnna clean my pop charger tomorrow...gnna use the kn kit cuz i dont have instant acess to the jwt oil...i have half tank left...maybe i shud fill it up

 

I hope that you checked to make sure there's oil in the engine. If the oil was just changed and it started knocking, I'd make sure they put oil in it.

 

5 quarts of mobile 1 put in by yours truley

 

With other cars, the only time I had knocks was because of crappy low-grade gas. Maybe you got regular instead of premium? Try a different station next time.

I would recommend filling up with premium at another station now. That might help a little until you can get a clean hi-octane tank again.

 

i told the guy premium maybe he put in regular??? but then id be getting really shitty gas milage...ill get gas from another station and clean the popcharger...if it stills knocks then time to bring it to nissan

 

maybe you should let him in









































JK... sorry i couldn't resist. good luck on your car tho

 

lol!! i usually pump my own gas...(i work part time at hess)...but i was in a rush and it was pouring outside

 

You know you have to poor the Mobil 1 in the engine after you drain out the old stuff right. . I would make sure your plug is tight and that you have enough oil in there or you will kill that motor real quick.

 

Did you stick with 5/30 or try something heavier?

 

Good luck let us know what you find.

 

Check the oil!!! Hopefully there is the right amount in there... If so you have been had by a Red Sox fan! He probably put regular in. Seriously keep us posted.

 

Right - double check the oil fill plug. It might not be tight! Never hurts to re-check.

 

Is the car KNOCKING or PINGING? Huge difference.

If the engine is KNOCKING at idle or when revving the engine not under load, don't start it back up until you get it checked. That is a lack of lubrication problem.

If the engine PINGS under a load, that is a gas, timing problem.

 

excuse the newbie question: how do you know if your car is knocking or pinging?

 

Yeah, I dunno the difference either. I guess it depends on when the noise happens: At idle or while pressing down on the accelerator.

It sucks here in Oregon....we can't pump our own gas. So I have to crane my neck and squint through the port hole to get a look at what the attendant is doing.