Tommy2JZ

okay so this is what happened. since i got the car its been backfiring idk why. i thought it was the valve cover gasket because the 6th and 5th cylinders would always be soaking in oil. anywho while i was "speeding next to another speeding car" one day i blew the water line behind the valve cover and it flooded my 6th and 5th cylinders elading to the roughest idle possible. anywho, i fixed all of that repaired some vacuum hoses, new plugs, new valve cover gaskets, cleaned the valve covers etc. got new wired the whole shabang. i thought my idle problem would cease but i still notice a slight shake once in a while and im pretty sure its a backfire. any ideas? this is the vibration kinda lol

____--________--_______--______ <== understand the diagram? happens every so often its weird.

also, i i have a whine. i thought it was the serpentine belt so i replaced that but it didnt go away. idk what that is. HELP. lol it sounds like it might be the timing belt or one of the pulleys or something idk.

SC400slide

iTrader: (11)

Could be MAF, but from your description, it sounds not electrical, but mechanical...

Tommy2JZ

which part? idle or whine?

SC400slide

iTrader: (11)

I was talking about about the idle.
Anyone else want to jump in?

Tommy2JZ

MAF ? whats that lol

Candela

iTrader: (1)

It is very minimal, almost unnoticeable, but my car does this as well; I put on some aftermarket parts--headers, intake, catch can etc. So it may be from that. Also, when I changed my plugs I put denso plugs, however I did not gap them --- perhaps that's the cause?

You gap yours?

And dude MAF = M*** Air Flow sensor ---- its on your intake pipe.

Tommy2JZ

yea mine is very minimal too. nah i didnt. i got NGK platinums was i supposed to? lol

OH nice, thanks! idk if its that though

SC400slide

iTrader: (11)

Usually if you purchase new plugs made for your car, they are already gapped.
I don't think that un properly gapped spark plugs would cause such a problem though.
Did you replace spark plug wires as well?

GS4_Fiend

iTrader: (22)

where is it backfiring to? the intake or exhaust?

Tommy2JZ

im rolling in NGK platinums today i was told if their not Denso's it might happen.

idk GS4 but like i feel the vibration caused by the backfire you get me?

Candela

iTrader: (1)

I didn't bother to gap mine because under the hood it says not to lol