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Date: Mon, 15 Jul 2002 01:12:58 +0200
From: Robert Brown <rjbnopsamnet.se.nospam>
Subject: Re: Sudden engine stop


Anders Fondal wrote: > Hi guys > > I have an 83 99 GL. > The car works just fine and have done so ever since I bought it in february, > possible with a little too rich mixture (occasional smell of gas, and a > somewhat low mileage pr. litre) > > However: It runs fine for about a kilometer or two, then it just dies on me. > I have power and ignition, but it won't run. I wait for a minute or two, and > it fires up like nothing happened. Then it just dies again. What is the ambient temperature? I know this part of the world has been getting unusually warm weather the past few weeks (between 20C and 30C)? Starting the car with cold engine or warm engine (having run it a few minutes before stopping and restarting)? > > > I have changed membrane in the carb, adjusted floater and replaced floater > valve. (when it runs, it runs very smoothly and in my ears very nice) > No gas smell, no sputter..... the carb's now in very good shape > > Could it be the timing module? or the distributor/cap? Don't recall that*my* 1983 99GL had a timing module ;-) Only points (brytarespets), which, if incorrectly spaced, can cause weak spark. Look for 0,4 mm at the widest point, or check for a dwell angle (kamaxelvinkel) of 50 deg +/- 3 deg. But I doubt that's your problem here. > > > Any suggestions wuld be of great help, > > Anders I used to get that problem in the summertime, especially if starting the car with a warm engine. Seemed to be caused by vapourisation of fuel somewhere in the fuel line or carburettor flotation tank, in my case. It would just sputter and die about after 500 metres or so. My solution was to turn it over on the starter motor. After 10 seconds I'd get nice cool fuel flowing through and problem would be solved. Another thing you could try is to adjust the valve for flotation chamber ventilation (ventil f–r flott–rhusventilation, see workshop manual section 2 page 231-18). Said to (and translated from Swedish) "improve warm start characteristics by preventing fuel vapour from getting into the system". And another: Check your temperature compensator (with a white plastic cover on it, sitting on the back (firewall side) of the carburettor). The black plug on the end of the thermometallic arm should start to move out (opening the valve) at about 20C. Best to remove the compensator (don't drop the little rubber gasket from the end that sticks into the carburettor), put it into water at 15C with an accurate thermometer, then heat it up to 20-22C on the stove. My recollection is if that valve starts to open too early, the idle speed will drop very quickly, with the kind of symptoms that you seem to describe. My engine could get problems from this regardless of whether it was winter or summer. The hint about the coil from Thomas and David sounds like the easiest first step to diagnosing. But if you want to try my suggestions then I can scan a couple of pages out of the workshop manual and email to you (email me, dropping the ".nospam" from the end of my address, if you want these pages) Good luck and tell us how you get on with the fix. Robert, G–teborg (2001 A4, 1999 9-3, 1983 99 GL R.I.P., 1983 900 GL R.I.P.)

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