Date: Thu, 12 Aug 2004 21:50:35 +0100
From: "Mike P" <>
Subject: Re: Boost probs - T16 1984

"Paul Halliday" <> wrote in message > in article, Mike P at wrote > on 08/08/2004 18:19: > > > Decided to keep the old Saloon :-) . Passed it's retest so now it's got a > > full 12 month MOT after putting a recon caliper and a new tyre on. > > The foglights were already working - the tester must have been pressing the > > wrong switch the first time! > > Yay! Yay! Indeed. What a top car! > > I took the car up the road for earlier and noticed it's not boosting full > > all the time. Sometimes it's fine, sometimes it only about 1/3 the way > > into the orange - base boost I presume. Seems a possible loose connection. > > I've checked the wiring to the solenoid and it's not cracked or showing > > signs of heat damage. Tests OK on a multimeter. Driving along in 4th, it > > would only pull base boost. Another time, similar speed and level road, it > > would boost all the way to the red. > > I would look over the APC box first. Make sure it is plugged in an connected > okay. If the box is missing or badly connected, you get basic boost. Box was there where it should be under the seat, no problems with connections. > I would also check whether your brake lights are stuck on. Again, if the > brake is applied, only basic boost is possible. I had a hair-trigger brake > switch not so long back that would alarmingly hit redline sometimes and > other times only basic boost. When you press the brake you should hear a > little "tick" from the LHS footwell. If you pull the air flue aside and the > LHS speaker out of its aperture you'll have enough light to what's what down > there. > Fine too. What wasn't OK was the manky wire I hadn't checked from the knock sensor. Spliced a new piece in, problem solved. Full boost all the time, APC working perfectly again :-) My 69 Saab is looking like a bargain! It's getting new oil, filters, plugs, leads cap and rotor arm at the weekend and I'll set the timing. Then I might start on sorting the rust on the front arches. Happy Saabing Mike

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