[thepaintballguy]

Ok, so I am really confused now. I disconnected the W/M kit and just tried starting the engine. I STILL get misfires in cylinders 2,3, and 6. It's consistant now and will not go away. I plugged the tubing going to the nozzles as well just so it was not sucking in any extra air or anything and it still does it. Whats the deal? Oh and my brakes don't work anymore ever since I have been getting the misfire problems. This is starting to make me mad. I did replace the spark plugs yesterday but I have done that a hundred times and never have had this problem. I put NGK BKR7E's in gapped to .028. I also have the GIAC-X ECU installed. Anyone have any ideas? Oh and I took the check valve apart again and it's fine. THere was NOTHING in there.

Pics:









Oh and the cylinders that are misfiring are 2,3, and 6. These cylinders are the ones farthest away from the TB. So IDK! [:@]


Josh

****EDIT**** PROBLEM FOUND!!!! See Page 2.

[dvldoc]

Those symptoms don't sound like anything alcohol injection related at all, Do you have your old ECM to install back in the vehicle to check it? A small vac leak should not cause those issues. IF you plug the line and it's not using fluid then that would not be the cause of your misfires.

Also things like ignition coils, plug wires, large vacuum leak (if you have a boost gauge check how much vac your making) Plug gap, fueling issues to the cyl ect could all be areas to look at. Do you have these at high rpms as well?

[thepaintballguy]

Yeah I didn't think it would but it started just after I installed the kit. Thats why I thought it might be causing it.

I will try installing the stock ECU back in and see what happens.

josh

[thepaintballguy]

Ok, I just tried the stock ECU and I am still getting a lot of misfires. Now I got them in all but cylinder 5.

josh

[thepaintballguy]

Another update:

I swapped the ICM's and it did not change anything.

I just swapped some of the coil packs around and the misfires do NOT follow them. They are still missing the same place as before. I now seem to have a vac leak but I can not find it. According to the pressure test there were no leaks. Could there be one somewhere else? Or is it just because the engine is working harder to keep itself running thus making it so it looks like there is a leak? The vavuum reads about -8HG. Where should I look? I have looked at all the big hoses, checked all the little fittings and can't find anything.

Oh and I tried unpluggin the MAF and that didn't do anything either.

Josh

[dvldoc]

-8hg is low very low, most vehicles are around 15hg to 20hg of vac at idle.

[dvldoc]

Looks like you should be running 18inhg on the S4 so you got a problem. Also ignition control module could be something to look at. Even if you move the coils around if that's bad it will not change what cyl are misfiring.

1.8T Common Troubleshooting Guide

[thepaintballguy]

ok so I just tried moving the coil pack that was giving the most misfires, cylinder 3, and switched it with the one that was not missing much, cylinder 2. Guess what!?!?! Cylinder 3 still misses most. I am so confused! Maybe it's the spark plug fouled up so I am going to swap spark plugs next just to see if that does anything. If so then I will go and buy new ones... again... and see if that fixes my problems. I still can not find any boost leaks so I am guessing the low vac is due to the misfires. I will let you know whats going on as soon as I can get them all swapped around.

Josh

P.S. I also swapped the ICM's around and it did not change anything so It's not them.

[thepaintballguy]

Ok, I just tried switching the spark plugs and still no change. I now get misfires on 4 of the 6 cylinders. Here are the codes I just pulled:

VAG-COM Version: Release 409.1-S

Control Module Part Number: 8D0 907 551 J
Component and/or Version: 2.7l V6/5VT G 4000
Software Coding: 06751
Work Shop Code: WSC 06325
5 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
16690 - Cylinder 6 Misfire Detected
P0306 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16689 - Cylinder 5 Misfire Detected
P0305 - 35-00 - -


As you can see it's the back 4 cylinders. The front 2 are fine. What else could be causing this? I am so lost right now. I want to burn my car.

Josh

[JettaRed]

Josh,

Are you getting these codes at startup and idle, or after driving around a bit?

When you clear your codes, make sure you do a throttle body adaptation (TBA) immediately after.