Sitting for years, how long? It's important you change all fluids, oil and radiator were a good start! How about the AT, fluid change s/b a priority! Have your cooling system "Pressure Checked" for leaks, chances are good you should also replace all hoses/belts too! Another concern w/b crud in the gas tank messing with your injectors!
Good Luck, sounds like you have an adventure ahead...enjoy the ride!
Gary

 

Lots of misfires on here comin up all of a sudden. Did you check your coil packs/compression for damage? Things smelling like coolant with no visible leaks can't be a good sign....

 

 

 

Just because it had oil in it does NOT mean that the coil pack was bad. Cyl6 is common to have oil in it because of the spark plug well seal. With the engine running, unplug ONE of the coil packs. If the idle gets worse, plug that back in and move to the next one. If the idle stays the same, then there is your culprit. Most likely a bad coil pack.

Also, be sure that when you changed the spark plugs that you plugged the correct wire into the correct coil pack. It's hard to mess these up as the wires aren't super long, but it is possible. I would trace the wires first making sure the correct ones are plugged in to the correct coil pack, and then move on to unplugging them one by one.

As for the exhaust sound, its popping and backfiring. These 2 sounds point to the fact that the car is not running on all cylinders. I'm willing to bet it's a bad coil pack or 2.

EDIT: Is it throwing a Check Engine Light? If so you can run it to any autoparts store and they will scan it for free. That will at least give you something to trace. Also, pressure test your coolant system like Gary mentioned. Rent the tool from an auto store, use it, return it and get your money back. Pressure testing mine revealed a massive crack in the OEM rad, which is where my coolant smell was coming from.

 

Yeah so you'll want to confirm a part is bad before replacing it, otherwise you're just firing the parts cannon wasting money and getting frustrated. But at least you have a new coil pack on hand for when you do find the problem. Oil in the wells doesn't cause problems unless its getting onto the spark plug contacts or its getting so high in the well that it interferes with the electric connection in the coils.


From your original edit it sounds like you have a bad misfire which would point to coils, injectors, or vac leaks if you've already changed the spark plugs. Try unplugging coils one at a time and seeing if one or more of them doesn't change idle when it is unplugged.


If you keep driving the car like that you'll blow out your catalytic converters, the popping is the sound of fuel igniting inside of them.

 

 

Yeah Nissan finally caught onto this as well and later G's they already have factory numbering on them.