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Old 10th October 2004
lyricon's Avatar
lyricon lyricon is offline
Join Date: Jul 2002                                                
Location: Montpelier,VT USA
My Saabs: 92' 900 T16
Posts: 273
Default Mis-fire just when started

My 89 900 T16 has developed a miss just when the engine is started. It will do this warm or cold usually after sitting several minutes. It seems to be the cylinder closest to the front. It will gradually start firing in about 1 minute or so. No backfire. I can make the same effect buy unplugging an injector. That is how I figured out which one was not working. Also I am getting boost cut back at a lower pressure than usual. May be releated? My thoughts; failing injector, fuel pump going, Fuel pressure Reg. Haven't checked the spark yet but that is next. Runs great after the miss stops. The boost cutback is under a pretty good load. Close to full throttle on a good hill near around 4000 rpm.
Appreciate any thoughts,
If it matters just changed coolant and thermostst to a winter one.
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Old 10th October 2004
REDTURBO84's Avatar
REDTURBO84 REDTURBO84 is offline
Saab Lunatic
Join Date: Aug 2002                                                
Location: no where
My Saabs: sold
Posts: 1,550

Hi, start the car warm and let it miss for a few seconds.Shut it off and remove the spark plug in the missing cylinder.Is the tip wet with antifreese?Is the tip tinted the color of your antifreeze?Sounds like a head (gasket) problem is likly.Please tell me I'm wrong. Pat
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