Do you have a Bentley manual? Do you have a diagram of your vacuum lines?

I'm not sure how you routed your water lines, but you could have inadvertantly knocked a line loose. Your car is 6 years old and some of the hoses may get brittle after a while. I have replace hoses on my older A4s that looked fine until you started moving them around and found they were cracked. The check valves seem to deteriorate even more quickly.

Why misfires are occuring on specific cylinders may have something to do with how they are detected. I will try to research and see if I can figure it out.

 

Wow! Reading about how misfires are detected makes my head swim! I better sit down!

Anyway, since the order is 1-4-3-6-2-5, it seems that the misfires are adjacent to each other in both cases; 3-6-2 anf 4-3-6. The misfire calculation is somewhat complex, but seems to be determined by lack of torque for the cylinder that is supposed to be firing. Can you check the fuel trim (032) and see where they are. Also, check your fuses. But I bet it is a cracked or split vacuum hose.

 

Oh yeah... How hard/how long will it take to replace all the vacuum lines? That really does not sound fun to me. LOL I know there is a diagram on the under side of the hood that shows where they all go. Has anyone ever done this?

What are the different sizes of hose that I will need?

josh

 

Someone else on AZ just suggested trying a new CTS? What do you guys think?

Josh

 

Cadillac CTS?

 

I don't think you need to replace all the lines, you just need to check all of them. Start with the lines closest to where you were working to install the kit, especially the ones connected to the brake servo.

 

CTS = coolant temp sensor.

Knowing the Audi way, i wouldnt be surprised if it is a braided line (probably fpr) that is cracked under the cover and you need to replace it.

 

LOL, no the Coolant Temp Sensor.

As for the lines I will do that tonight. I also just sent a message to a guy I know who owns an S4 near by me and asked if he would be willing to come over so we can try swapping a few of his coilpacks into my car and see if my problem will go away. A few guys on AZ say that if you have one coilpack that is dead it can cause other cylinders to misfire as well. I am thinking it's coilpack number 3 that is dead since thats the one that gets the most misfires. I will try moving that one tonight as well to see if the mass misfires follows that one. Uhh I hate this.

Josh

 

It seems really odd that all this has happened since you put on the water kit. However, if it is a coil pack that was marginal, the added stress of trying to ignite the mixture with water could put it over the edge. In the 1.8T world, coil pack failure was prevalent. One of the main causes was having spark plug gaps too wide. Though the manual says you can go to .031", I had several fail on my GTI until I closed them down to .028". The problem is that the wider gap, especially on a chipped car, requires more voltage to jump the gap. Under increased boost (and/or water), the coils eventually burn out because they are discharging greater voltages.

I just replaced the ICM and one of the coils on my '99 A4 because of misfires. My son drives the car and told me the CEL came on. He didn't notice any problem driving the car.

If you haven't already, you may want to pull your plugs and check the gaps.

 

I just put new plugs in (NGK BKR7e's) gapped at .028. I pulled them out and checked them again and they are still the same. .028.

Josh