sa3dos
4/29/2008 7:36:09 AM
Guys,
I just got '03 A4 about a month ago, it has 65,000 miles. There is an annoying thing about the car, slight Engine Vibration.
Symptoms:
- Start Engine, car is reving at about 1100rpm (Idle) --> Steering is vibrating (not major vibrations, but moderate)
- 2 minutes after, engine revs linearly down to about 800rpm --> Steering is vibrating less (compared to before, but still vibrates)
- I tried opening the driver door and hold the top frame at the corner, i can feel the vibration
- Slight Ticking noises every 5-8 seconds coming from the centre of the engine
- VAG-COM: No Engine Fault Codes
- No CEL
What I did to it so far:
- Replaced the spark plugs (One spark plug was very loose and the combustion had reached the tip of coilpack, wiped it with a cloth and it all went away)
- Replaced AirFilter/PollenFilter
- Changed Oil (Used Synthetic Castrol 5w40) and OilFilter (original from dealer)
- I dismounted the Throttle Body and cleaned it (I noticed oil on its inside, a little bit in the intake manifold surface also, and little oil at the intercooler exit hole, looked like clean oil, not black) I am confused how did the oil reach into the air system, but anyway, cleaned everything I can reach.
- I visually examined the rubber engine mounts, they didn't seem to have any sign of rupture
Suggestion for next step?
Planing to change timing belt, water pump, tensioners, etc.
Should I consider purchasing a new set of Coilpacks? Does any of the symptoms relate to a failing coilpack? (Note: no CEL and vag-com does not indicate any cylinder missfire)
I am confused.!
pa4ul
4/29/2008 8:16:08 AM
sounds kinda like a coilpack. if shaking continues to get worse its a coilpack. at ecs tunning they carry the hitachi stage1 coils for like 120 or something like that for four. I had to replace them also because i had a vibration at idle.
sa3dos
4/29/2008 8:44:44 AM
Well, I wanted to take an extra step and confirm that it is the Coilpacks.
I was thinking of running one of the two methods mentioned here:
http://forums.audiworld.com/a4gen2/msgs/1003672.phtml to verify which one is failing. For some reason I can predict that it's impossible that one of my cylinders is missfiring because the vibration would be scary plus CEL will be on, or at least will show on VAG-COM.
Can coilpacks semi-fail? meaning, Not operate as efficient? or are they of the type "WORK" / "DON't WORK" ?
