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Re: SAAB 900 1988
Your problem with the APC system. Any perceived fault and you only get base boost. The most likely fault is the boost pressure sensor located under the dash on the left-hand side. when it is bad you often hear the APC solenoid valve clicking at idle.
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Need more details but that reminds me a little bit of a 9-3 we had that had a failed MAF (Mass Air Flow Sensor) that lost a ton of power and was groggy until we swapped it out with one from another car. Won't coast baffles me... maybe the turbo is seizing up??
Turbochargers do not kick in they always work from the time you start your engine to time you shut it off, normally the fault of turbo means you have loss of oil and black smoke of the exhaust, if there is a loss of power it can mean few things and it is only diagnostics and proper garage to tell, as well it can be a fault in the fuel system. Get it checked properly.
No. Turbo charged engines have been designed to have the turbo. The turbo uses exhaust gas to spin a dual air compressor to push additional air into the intake, without it the car probably won't even run. There are numerous electronics monitoring pressures and temperatures. Sorry turbo has to be fixed for car to run properly.
The turbo will not cause black smoke. White smoke, yes, if its passing oil into the engine, but not black.
First check that the air intake and filter is not blocked, check that the air hoses from the turbo and intercooler are not collapsing when given throttle.if thats ok, then get the injectors tested, if they are ok then you need to get the injection pump serviced. Black smoke is a result of overfuelling, either by the poor dispersal of fuel from the injectors or the pump, or blockage of air into the engine on the intake system.
Hope that helps
I think the actual problem may be generic to Saabs of the same age. So maybe this information will help many others
Yes the turbo was faulty but no it was simple to fix and did not cost me a lot.
the wastegate ( a valve which is opened to switch on the turbo) is driven by a vacuum actuator - and the actuator leaver arm which connects to the wastegate to the actuator had fallen off.
So The wastegate valve was stuck semi open up and never moved.
This does not directly show any engine error or cause any emissions problems, as the car passed an a mot before immediately before the fault was found.
My local garage man did the work needed in 2.5 hours on the ramp and did not have to take much too bits to make a good repair.
Car goes like a train, and the engine management light - which was coming on at odd times has since stayed off.
I suspect that the management light which was coming on due to emissions sensors -- triggered by some series of events which cause the emmision to go out out of line, due to the turbo not fully working.