Just alittle FYI. I was recently feeling my 99'1.8T was running alittle rough and seemed down on power. No fault codes or CEL were being triggered. I decided to finally use my VAG-COM and monitor block 015 and 016 on my commute in to work. I noticed during acceleration that I was getting muliple cylinder misfires on cylinder 1. I quickly assumed it was a bad coil pack since I recently had to replace my ICM.
What I initially thought was the coilpack turned out to be a bad plug connector (the rubber boot that goes between the plug and coil pack). I was too lazy to check the resistance value from the good connector to the bad one but i can assure you it made a world of a difference. I found it odd though that it never triggered a fault code or a CEL. Needless to say I replaced all four and the car runs much smoother. Just wanted to give you guys alittle heads up.
What I initially thought was the coilpack turned out to be a bad plug connector (the rubber boot that goes between the plug and coil pack). I was too lazy to check the resistance value from the good connector to the bad one but i can assure you it made a world of a difference. I found it odd though that it never triggered a fault code or a CEL. Needless to say I replaced all four and the car runs much smoother. Just wanted to give you guys alittle heads up.
