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I've posted on this a while ago, but never got a response. I'm curious about this as the vacuum line on my '87 9000 Turbo for the hooter valve, boost gauge, & map sensor is attached to one of the ports on the throttle body. This has always made me question how you could get a vacuum reading with the throttle closed? It makes much more sense to me that the best place is on the intake manifold, on the outlet side of the TB, to read the actual intake pressure. So, with this in mind, I recently took the line for the gauge & map sensor and attached it to the port for the charcoal canister (since this is not connected properly right now anyway). I then ran the line for the hooter valve to the same connection on the TB.
One of the reasons I did this is to have an accurate reading of what is actually going on in the intake. Another is that when I would let up on the throttle I would get a pressure spike on the gauge, as if the hooter valve isn't doing it's job. I must admit I wonder how the hooter valve would ever be opened by vacuum when the line for it goes to the inlet side of the TB where you won't have vacuum when the throttle is closed!
If anyone could enlighten me as to how this setup (normal setup) is supposed to accomplish this I'd surely appreciate it. I've already been told to look for a vacuum leak, btw, and there aren't any. The hooter valve is fairly new and works fine also. Thanks in advance for any input.
Tom R.
'87 9000 Turbo
2.3L head
298,000+ miles
posted by 64.175.6...
, Thu, 16 Oct 2003 20:44:55
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