supercharger vacuum leak really isn't?
All of you supercharged owners might be interested in the following:
While troubleshooting and trying to find the cause of a rough idle on my supercharged '92 SSE, I tested for vacuum leaks by spraying injector cleaner around the base of the supercharger, and although no idle change was observed when I sprayed it at the base gasket on the pulley side of the supercharger, where it is reportedly prone to vacuum leaks, or while I sprayed it around the rest of the base gasket, a BIG change was observed when I sprayed it around the butterfly valve shaft attached to the boost bypass valve - the engine stumbled and almost stalled so I stopped spraying there. I first thought I had found a vacuum leak, but just for kicks I sprayed it on the same area of my '93 SSEi which has a smooth idle, and the engine stumbled on the '93 also. Conclusion: It seems this area of the supercharger normally leaks air. Have any of you ever tried this? So my hunt for the cause of the rough idle continues... |
Bill, the vacuum fitting under the nose of the SC is only on the M90 (Series 2).
I currently have my SC torn down, and I can tell you the bypass shaft is not airtight. I think that's normal. |
[quote="willwren"]Bill, the vacuum fitting under the nose of the SC is only on the M90 (Series 2).
Bill, I wasn't referring to the vacuum fitting under the nose of the SC; I was referring to the base gasket on that side of the supercharger; I've read that this area of the gasket on the M62 is prone to vacuum leaks. At this point, I almost wish I had found a vacuum leak around the base gasket - at least that'd give me a clue to the cause of the rough idle. It's no fun sitting in traffic in a car that has a rough idle. My motivation for writing this post is to let others know that it seems normal for the shaft for the butterfly valve to leak air. |
A mechanic once tried to convince me that there shouldn't be a leak there (he showed me by spraying WD-40). I couldn't think that there was anything abnormal (I must admit that I did try to stuff an O-ring in there).
I am having some idle issues of my own recently. Haven't been able to figured out what's causing the issue, either. |
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