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Date: Wed, 10 Apr 2002 23:25:20 +0200
From: "Johan Beikes" <j.beikesnopsamdoo.nl>
Subject: Re: bad start wen engine is cold on a 900i 86 310000km


The temperature switch activates the cold start valve. At starting the engine when it is cold, the start valve will be activated during 8 seconds. If the engine starts, runs a few seconds and then stalls, then probably the switch and cold start valve aren't the problem. Other areas are more likely. The warm-up regulator might be faulty. The device is seated near the coolant thermostat housing. Two petrol lines and an electrical connector are attached. You need some tools to check it out. Another device is the auxiliary air regulator (in good Dutch: extra luchtschuif). This thing is located next to the inlet manifold at the front side of the car (clutch side of the engine) and has two air tubes connected and an electrical connector. If you disconnect the air pipes, you can see right through if the engine has not been running that day. When you switch on ignition, slowly the hole will close and after about 10 - 15 minutes, it should be completely closed and you cannot see through anymore. When faulty, replace it. If the above does not help, you probably have a fault in the line pressure and / or control pressure of the injection system (in good Dutch: systeemdruk en stuurdruk). If you do not have the tools to check, the only way is to have the garage look at it. Lengthy advice, but i hope it helps a bit. Good luck! Johan Patrick Timlin <ptimlinnopsamo.com> schreef in berichtnieuws c6ad2bc.0204090558.2ab4fad7nopsaming.google.com... > "foot" <onetimeaday121nopsamail.com> wrote ... > > its just as you say and its an 8 valve. what must i do > > greetings foot > > OK here is how it works on my wife's 1988 900 8-valve (mine is a 16V > so different beast)... > > On top of the engine, errr I guess on top of the valve cover, there is > a two terminal device. This is a temperature switch. Of course two > wires go to this device. When the engine is cold, like below 40F or > some such temperature, this switch is closed. Once the engine warms > up, this switch opens up. I forget what this switch activates, but > whatever it is, I think adjusts the fuel mixture or something like > that on really cold days. On warmer days, or after running the engine > for 5 minutes, this is no longer needed or used. > > So on my wife's car it was doing the same thing as yours. I discovered > if I simply unplugged this temperature switch the problem went away. > Note, this isn't a fault of the temperature switch since it is working > fine. It is whatever the switch activates on cold days that is causing > the problems. > > So open your hood & start your car cold. When it starts to rev up and > down and almost stalls, unplug one of the terminals going to that > switch. If it is the same as my wife's car, it will stop almost > stalling and run normally. While the car is still cold, plug it back > in and it should start rev'ing up and down again. > > On my wife's car, since this "feature" is only used for 5 minutes in > the morning for a couple months a year, I simply left it unplugged and > it has been fine for about 5 or 6 years now. The only thing you have > to watch out for is sometimes when you get the car serviced, the > mechanic might plug it back in if they notice it off. And you won't > notice if he does it in the middle of summer until many months later, > at which time you have completely forgotten you had the car worked on > and might wonder why your car is doing that surging again. > > If you have trouble locating that switch (or if your 900i has a > different engine that my wife's North American 900), I can take a > digital picture of the part I am talking about and email it to you. > > Best of luck! > Patrick

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