Guys

I've had various vac leaks on my SSEi which has been addressed with all new custom fabbed vac lines, as well as new upper and lower manifold gaskets. There was a bit of pitting in the aluminum head which has been corrected with JB Weld.

However at idle the boost gage waggles, its not very much, but its reading between -68 and -66 kPA. Metric Boost gages are in kpa not PSI and range from -70 to 70 with 0 at the top. Based on that you can understand how much the waggle is.

Do your cars do this? Or am I still experiencing minor vac leakage? Once its warm this becomes less of a problem. Perhaps its just a cold temp issue and I have nothing to worry, but I wanted to hear what you guys are reading at idle.

Thx

Mine does that too. Haven't figured out if it should or not...

Ditto, its happening to me too.

it happens on my electronic one on the dash but not my mechanical one.
Its just somthing with the electric gauge not the actual boost.
Infact the stock boost gauge is so far off somtimes its not even a referance

Good enough.

As long as its not idling rough, there is no comprimising of the vac system.

Thanks all.

both my SSEi'* have done that, its normal to my understanding

Neither my 93 nor my 95 does that, and the 93 didn't do it with either the Gen2 or Gen3 SC on it.

i dont recall my 95 doing that either.. its been 5 months since i have seen it idle though

My '92 doesn't do that either.

Thinkin' there'* still some vacuum leaks hanging around. Vacuum lines are one thing. Leaks at the two vacuum manifolds on the SC may be an issue, or even at the EGR stovepipe.