replace spark plugs A6 4.2
#4
04-04-2009, 02:12 AM
Bosch is best
I just replaced the plugs tonight actually on my 2004 A6 4.2L. I installed the Bosch 4417 plugs, they are the four tip platininum "air gap" plugs. I chose them as they were recommended by Blau. I pulled the original plugs out tonight, those happened to be Audi branded Bosch plugs, but they were the traditional single electrode, thick core plugs. These new 4417 plugs have a incredibly thin center electrode. I got them at O'Reilly's for under $6 each. The job cost me $50 and took a casual, unhurried three hours, and I was detailing engine parts as I went along. Audi dealer quoted me $450 to change the plugs.
Its an easy job, especially if you have the figured out how to get the bottom clip on your air box refastened. I'd show you but I'd have to kill you. LOL.
Be careful releasing the clips on the ignition coil packs, they break very easily. As gentle as I was tonight two of them decided to give up the ghost. If you are creative, you can secure the ignition connector with one or two zip ties, as I don't plan on getting a new wiring harness anytime soon. Thats the nice thing about the Audi engine shrouds... nobody will see your zip tie handywork.
My 4.2 was really lagging in the OOMPH department. Idle was slightly rough, I had one fouled/flooded start, and power was hit and miss and check engine light turning on about every three days. After the change (good time to change your air filter by the way) I can report great improvements. She fired up perfectly, with a velvety smooth idle, like you should expect from a v8 audi. I took her for a gentle drive and immediately noticed effortless power was back. In sport mode she was spirited and was dancing between gears again.
Turning onto the last road to my neighborhood I dropped it to the floor. After the obligatory Audi pause while the car decides you are serious and then flips the manifold over... she took off like a pissed off banshee. I have really gotta get a custom exhaust. The fun is back again, now I need some rumble.
Not sure why guys are recommending NGK when the OEM plug is Bosch. NGK makes great stuff. I can personally tell you the Bosch 4417 rocks in the 4.2.
Its an easy job, especially if you have the figured out how to get the bottom clip on your air box refastened. I'd show you but I'd have to kill you. LOL.
Be careful releasing the clips on the ignition coil packs, they break very easily. As gentle as I was tonight two of them decided to give up the ghost. If you are creative, you can secure the ignition connector with one or two zip ties, as I don't plan on getting a new wiring harness anytime soon. Thats the nice thing about the Audi engine shrouds... nobody will see your zip tie handywork.
My 4.2 was really lagging in the OOMPH department. Idle was slightly rough, I had one fouled/flooded start, and power was hit and miss and check engine light turning on about every three days. After the change (good time to change your air filter by the way) I can report great improvements. She fired up perfectly, with a velvety smooth idle, like you should expect from a v8 audi. I took her for a gentle drive and immediately noticed effortless power was back. In sport mode she was spirited and was dancing between gears again.
Turning onto the last road to my neighborhood I dropped it to the floor. After the obligatory Audi pause while the car decides you are serious and then flips the manifold over... she took off like a pissed off banshee. I have really gotta get a custom exhaust. The fun is back again, now I need some rumble.
Not sure why guys are recommending NGK when the OEM plug is Bosch. NGK makes great stuff. I can personally tell you the Bosch 4417 rocks in the 4.2.
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