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Car Forum / Saab Cars / February 200689T hesitates revving, loses power at low speed
My '89 9000T has started hesitating, by which in this case I mean that I've had several instances now where at low speed, say 25mph, I want to speed up but applying the pedal doesn't increase the revs at all. In fact the revs I still have aren't powering the car forward. So for a few seconds I'm just rolling as if in neutral, then something 'catches' and the motor revs up. It feels like the car is about to stall completely, but it doesn't quite do that. After the first couple of instances I did some web research and found one thing I could do myself right away. The idea was to get off premium gas (I usually run 92 octane). I had room for only about 6 gallons, so I added that in 89 octane. It happened again anyway. I then took it to a knowledgeable SAAB mechanic (Ryan's in Northampton, MA) and of course they couldn't get the symptom to appear on a test drive. Nevertheless they found a failed turbo bypass (hooter) valve, replaced it, and cleaned the throttle plate. For a few days after that, maybe just 75 miles, it didn't happen. Then last Sunday it happened as I was exiting a turnpike tollbooth (after running at 85mph for an hour). Since then it happens every time I take the car out, within as little as 100 yards, up to as far as 2 miles. So it's not a running hot symptom. These last few instances have been not quite as alarming as the first three, lasting maybe 3 seconds instead of the previous 6 seconds. I now have another appointment at Ryan's on Monday. Meanwhile, any guru ideas? The car is 16 yrs old what do you expect it to run like new. If you want it to run perfect get a new car. > My '89 9000T has started hesitating, by which in this case I mean that > I've had several instances now where at low speed, say 25mph, I want to [quoted text clipped - 23 lines] > > Meanwhile, any guru ideas? Well I'm not exactly a guru, but: Does it have DI? When the DI Cassette was changed last time? If yes and not for a while I'd try a new DI cassette... Naturally there are several things that may cause same kind of behaviour, but sounds quite like the symptoms I had in my -89 9kTA when DI was failing. SuoTimo > My '89 9000T has started hesitating, by which in this case I mean that > I've had several instances now where at low speed, say 25mph, I want to [quoted text clipped - 23 lines] > > Meanwhile, any guru ideas? It could be one of a number of things, but I'd start off by examining the AMM and the connector which plugs into the AMM - a fault there would produce these symptoms.  SignatureGrunff Could be the fuel filter is becoming clogged. >> My '89 9000T has started hesitating, by which in this case I mean that >> I've had several instances now where at low speed, say 25mph, I want to [quoted text clipped - 23 lines] > AMM and the connector which plugs into the AMM - a fault there would > produce these symptoms. I will add one more check. There is a temp sensor on the head between the intake ports ( I think between the 2 and 3 cylinders). I had a lot problems starting my car and keeping it running because of this sensor. In my case it had not failed, but the connector had so it was making poor and intermittent contact. Once I repaired the connector, it started running like a champ. Jim 1987 900S > I will add one more check. There is a temp sensor on the head between > the intake ports ( I think between the 2 and 3 cylinders). I had a lot > problems starting my car and keeping it running because of this sensor. > In my case it had not failed, but the connector had so it was making > poor and intermittent contact. Once I repaired the connector, it > started running like a champ. On my '89 and my old '88, the sensor was directly under the thermostat. The hole between cylinders 2 & 3 was just plated over. That might be a turbo-only thing. I've just had a look and my mate's '87 is the same as my '88 and '89. Paul Vart tog vägen vägen? SAAB : Nothing on earth comes close > It could be one of a number of things, but I'd start off by examining > the AMM and the connector which plugs into the AMM - a fault there would > produce these symptoms. Thanks, that's what it was. Sorry to take so long getting back here. I installed a used one I got on eBay for $25 and the problem went away. |
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