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Date: 9 Apr 2002 06:58:38 -0700
From: ptimlinnopsamo.com (Patrick Timlin)
Subject: Re: bad start wen engine is cold on a 900i 86 310000km


"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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