skytower31

iTrader: (4)

Last night after driving home from work, I noticed a rattling noise coming from the engine bay that immediately made me think my engine was pinging. No SES light, car drives fine, etc. Scanned the car on the way to work this morning and no KR and the LTFTs were just a touch negative like they should be.

When I get home tonight from work, I hear the same noises again. This is after a fresh tank of gas and 100 miles driven on that tank. The tank before this I used some fuel injector cleaner (FP60 from Lube Control). This new tank of gas I did not use the cleaner.

Any thoughts on this? What should my next step be if after running through this tank of gas doesn't help anything? If the engine is pinging, shouldn't I be seeing some KR?

Thanks all...

777

iTrader: (21)

check for an exhuast link...

skytower31

iTrader: (4)

Well I have some exhaust leaks coming from my y-pipe, so and I know that is what the ticking is that I hear...but this is different. It is a definate sound like a marble rattling around in the engine which I have read is often associated with pinging.

shouldaboughttheZ

iTrader: (8)

Mine does this also. I know the spark plugs need to be changed and fuel filter also. Mine has 64,000 on the clock.

skytower31

iTrader: (4)

I regularly change my fuel filter and recently did the plugs...I suppose I could change the fuel filter again just to be sure...it is cheaper than plugs.

nirvana91

iTrader: (1)

this will sound stupid but what weight and kind of oil are you running? i had the same problem on my 98z. id take off from a stop sign or get on it and id get the same rattling sound and when the the car sat and idled it sounded like crap. first thing i did was put good gas in it since my girlfriend put the cheap junk in and it still did it then i found out when i was out of town she took it to walmart and had the oil changed. they used a fram filter and regular pennzoil 5w30. i went and picked up a supertech filter and some castrol syntech 5w50 put it in and it killed the rattling. car is quieter than i ever remember. before i put the 5w50 in i was getting a lot of crap about the 50 it was to heavy for winter. 10 degree temps and car fired up perfect with the pennzoil idling warm my oil pressure was at like 22 and now car can be hot and stay idling at 40 psi. try it i was just about to get rid of it but not now. ifeel like a punk using the 5w50 but i dont know if ill ever go lighter again. oil or filter dont know which suicked but ill stay away from both

OneMeanZ

iTrader: (2)

Ive heard FRAM filters don't let ANY oil to the valvetrain, so maybe it could be the valvetrain.........change the oil filter and see if that helps

skytower31

iTrader: (4)

I have used Mobil 1 5W30 Synthetic from the first oil change and I bought the car new. I have also only used the high grade K&N oil filters. So only the best has gone into my car.

I have not heard the noise the past two trips in the car...so hopefully it is gone and it was just bad gas

99PontTA

i've had the trouble ...never did figure it out.......just ls1 weirdness

skytower31

iTrader: (4)

So yesterday it was gone...but it is back tonight

nirvana91

iTrader: (1)

dont they say mobil 5w30 is like a 20 w? id still go with a heavier oil and see what happens. what kind of oil pressure do you got when your at idle before you here the sound?

skytower31

iTrader: (4)

Usually around 40psi or so.

nirvana91

iTrader: (1)

id still give it a shot. mine hovered right around there to and just changing the oil fixed it. it couldnt hurt.

skytower31

iTrader: (4)

I am going to see if I can find any of that magic Castrol 0w40 stuff people are always talking about...