shaddy-z.

Alright to start things off, my engine has been misfiring lately and it's driving me crazy. The car is hardly drive-able in it's current state because it's a struggle to keep up with traffic especially when having to jump on the freeway. This is what happens:

-Weird idle, RPM's jump from 600-700 and you can hear a low backfire in the exhaust.
-When accelerating the engine will "choke" or "stutter" like it's fighting to accelerate. It accelerates VERY slowly.
---- During both of the above, the car is shaking.

The CEL IS NOT on. Sometimes it flashes and I happened to catch it and was able to run the code and it came back with a cylinder 1 misfire code. Today, I replaced cylinder 1's spark plug AND switched the coil from cylinder 1 to cylinder 5, that way if the CEL came back on and the misfire code followed the coil it would be easier to trouble shoot. In cylinder 5 there is oil leaking from something, probably the valve cover. The leak is bad enough that it is now on my plenum.

I have done all the resets possible and for some reason the problems will totally go away, then after driving the car more and more the same problems reoccur. I believe this is because after the ECU gets enough misfire codes it finally falls into the same state as before. My Y-pipe has a tear if that makes any difference, and before anyone asks, yes I use 93 octane.

What could possibly be wrong? Please help! Thanks

cubs4worldseris

iTrader: (6)

Did you do anything to the car right before you began to experience this issue?

shaddy-z.

Nope, pretty much just out of the blue. I haven't done any mods recently.

chrisman287

Pull your plugs and see what they look like. Your spark plug tube seals might be shot.

shaddy-z.

Plugs seemed okay... Could it be a bad fuel pump? I have no idea and I don't want to spend a boat load of money trying to fix every possible problem it could be. And work/school schedule aren't exactly "work on car" friendly unfortunately

SuperBlack350z

iTrader: (59)

sounds like a coil pack.

Uprevtuning

Do a compression test.