I think you may be right. I'll have to look tomorrow. Gonna go to look at another audi that's being parted out and figure out for sure where they go. Will this maybe fix the p0303 code? What other things should I look at in relation to this code?

 

No, the misfire code is another animal. It could be a coil or the spark plug on that cylinder. I recommend putting a new set of plugs in it first. Clear the codes on the ECU and see if it pops up again. But.. While you're putting the plugs in, swap the coil to another cylinder, say number 2 cylinder, if the code P0302 (misfire on cylinder 2) comes up at some point, the misfire is following the coil. So that would indicate the coil is going bad.

 

Sounds like a great place to start. I'm gonna drain the gas and put fresh gas in it before I try that. No telling how old the gas is. Thanks alot for help. I really appreciate it.

 

Good idea.. That ethanol crap gas is the worst if you let it sit... Get as much as you can out of the system and add some fuel treatment to it when you do put some back in. Put a new fuel filter on it too. I bet some water comes out of it. If you can get some no-ethanol fuel to put in it while you're working on it, that will help too. Once you get it back on the road, you can run the ethanol gas since it's not going to get a chance to sit around.

 

Any idea on the best way to drain it? I added a gallon of no ethanol 90 octane. Once I did that it was showing a quarter of a tank. Also put a bit of sea foam in it. I really just want to drain it.

 

Unfortunately there is no real easy way of draining it with the way that these things are made now. The fuel pump is in the tank and there are no supply lines that exit the bottom of the tank. You have to go in through the fuel pump assembly port on the tank. But screw all that, too much work to just drain the gas. Siphoning is out too. You'd never get the crud settled to the bottom siphoning anyway...

What you could do is, since water will settle to the lowest point in the tank, that is where the pick up is, you could disconnect the fuel line at the fuel rail on the engine and secure it into a container to catch the fuel as it comes out. Turning the key on will cause the fuel pump to come on for a few seconds. If you do not try to crank the engine over, the ECU will turn off the fuel pump until it sees the engine turning over. I'd just turn the key on and off a few times, checking to see if there is any gunk in the bottom of the catch can with the fuel. Wait a few minutes between cycles to let any crap that got stirred up in the tank to resettle. Keep doing this until there is no more crap settling to the bottom of the catch can. Once you're done there, put the fuel line back on and see if the car will fire and run. Let it run for 5 or 10 minutes, keeping an eye on things, so the fuel you put in and the Sea Foam (I love that stuff) will mix up well in the tank.

Loosening the fuel line at the rail with a catch can and jumping the fuel pump relay is another option. But you'll have to spend time finding the relay and determining what two terminals to jump. I don't recommend this procedure to anyone that doesn't have experience doing this though. You can drain all the fuel out of the tank this way. However, since you said you've already put more gas and Sea Foam in it, I'd just to the procedure I mentioned above and run just enough gas out to get all the crud (most of it will be water) out..