Date: Fri, 10 Sep 1999 13:21:06 GMT
Subject: Re: Please help with problem that has baffled everyone

In article <>, Tony Collins <> wrote: > If twiddling with the Idle air contol makes the car run all right then you probably have a fuel mixture problem. which is cause by either a physical airleak or the injection system Check ALL the electrical connections to the fuel injection system. Make sure they are clean and making contact. I had a similar problem with an injected engine in a fiat which I finally traced to a dodgy throttle position sensor with an intermitent fault, thus fooling the ECU every now and then. So if you can check that all the various sensors as well to make sure that they are working correctly Make sure that your inlet manifold is not leaking air, not just the hoses, plus you have no leaks downstream of the air flow sensor (if you have one) Also if possible make sure that the ignition timing is correct. Finally check that you are getting the correct fuel delivery from your tank, You can disconnect the fuel line and then by turning on the ignition and pushing the air flow sensor the pump should run. You should get a reasonable flow about 1 litre/min (?) if not check for crushed/crimped fuel lines, tank not breathing correctly. If you can't do it yourself/haven't the tools take it to a specialist fuel injection place such as Lucas or Bosch as they tend to know what they are doing. Good Luck Malcolm Stonehaven Scotland Need urgent help SaaB 9000 i 1989 non turbo. > > Idle's fine but as soon as the accelerator is depressed the revs drop to > around 300rpm and the car almost stalls. > > If I release the accelerator it goes back to idle fine. > > Hi revs can be obtained over a period of time by carefully catching the > revs at the right moment (skillful driver talking). > > Idle Air control valve if dismantled and turned by hand the car responds > correctly. > > I have replaced the fuel pump, the idle control air valve and the fuel > filter. All hoses have been visibly checked for vacuum leaks and seem OK > (ie don't look porous) but I haven't had them off to pressure test them. > > Sent it into the Saab garage who said it needed a new fuel pump (hence > me replacing the fuel pump) but it didn't make a difference. > > Saab and other garages have no idea what to try next. > > Can anyone help please. > > Tony. > > Sent via Share what you know. Learn what you don't.

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