429idi

My sister just bought a 1991 quattro v-8, and it failed emissions. I've never worked on an Audi before, so I have a lot of questions.

After it failed the first time, I replaced the spark plugs and ran a fuel system cleaner through it. It passed the 2000rpm test, but failed the idle test. I blinked out the codes and got a 2342, so I replaced the oxygen sensor, changed the oil, and changed the air filter. It did a lot better, but still failed HC at idle. Now I get a 2341 code. I hadn't replaced the cap/rotor/wires because of the cost. I tested the wires with my multimeter, and all were 5-6k ohms except #4. I pulled the caps off, and they are burnt pretty bad. I decided to replace them, but I can't get the rotors off, and I don't want to break anything.

My questions are

1. Is there a trick to getting the rotors off, or do you just pull really hard?
2. Are there any other obvious things I should check with a 2341 code? (fuel pressure regulator diaphragm isn't ruptured)
3. The engine seems to have really weak vacuum, is that typical with these? Is that why they use hydro-boost?

Thanks for any help. I have read through the forums over the past week, but haven't been able to answer any of these questions.

toml99

Rotors are glued on, so only way to get them off is by crushing them with a pair of channelocks. Check for vacuum leaks...expecially the Carbon Canister Solenoid Valve that lives under the coolant reservoir...2piece design that when rubber get's old, can cause huge leak...If you need a used #4 wire, let me know. Good luck, Tom