Bad Coil Pack
When driving home with my wife and 1 year old daughter I noticed some hesitation on normal acceleration. So I did a WOT in 2nd gear and man my car did not like that. It start to misfire really bad. So I continued on home and within 2 block of getting there I lost at least 90% of my power. I barely could get the car in the garage. My ScanGaugeII was not picking up any error code so that was not a good sign. Also, my car smelled like sulfur.
I call up my friend Erik that owns I.P.M. Auto Service here in Redmond and ask him if he could bring the Vag-com over. After a quick scan it showed that cylinder 6 was the only one misfiring. We took out the spark plug and it looked just fine. So we swapped in a old OEM coil pack that I had kept just in case. Fired up the S4 and it was running fine. First time I was able to get something fixed in under a hour and at no cost.
What's odd is that all of my coil packs were replaced 2 years ago/30,000 miles so they are not old at all. They are the Beru brand so maybe the quality is not that great. Hopefully the rest of them are ok and stay that way for a while.
3/2/2011 10:01:32 am
If you have any oil in your well/in the boot/on the coil packs then that could possibly accelerate wear to your coils.. Also Beru is the OEM part. I have heard that there are also Hitachi coil packs but that they are identical.
Well a month later the coilpack I replaced was going bad. I could not believe it. I was thinking there must be too much resistance in the connection (wires) to the Coil causing the coil to burn itself up. So I check the wiring to look for any cracks or other corrosion and found nothing. I took out out the spark plug once more and it was still clean. Checked the gap and it was prefect. Then I noticed it... The Denso Iridium Spark Plugs have a small metal screw on cap that connect to the coil. The cap was barely on. So I tighten that up and put the coil back on and when for a test drive. Sure enough problem fix. So far it has been a month since I fix that and all is still good.
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