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Base boost again & solution, FYI..... Posted by nuysSAAB [Email] ![]() ![]() |
Took a drive up the coast over the weekend and at some point, my wife, who can hear a pin drop a mile away, asked what the whooshing sound was under the steering wheel ( wasn't me - we hadn't had lunch yet ). She said she heard it when I accelerated so I watched the boost gauge and it said base. Got home and yanked out the lower dash and went looking for bad hoses.. didn't find any but did hear a slight air hiss at idle coming from the pressure sensor/over boost switch area. Checked both out and it turned out to be the over boost switch that was hissing. I checked it with a vacuum pump and could hear a click and hiss - it wouldn't hold vacuum so I assume the diaphram was shot. I replaced it with a spare I had and it solved the problem.
Just thought I'd pass this along for those who drive an '85-'88 turbo.
The ride would've been more fun with boost but it was great anyway. Had a late lunch at an Irish pub in Ventura complete with fiddles & whistles.
'86 900 SPG
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