Hi I have a 97' Saab 900s. When the temp is 30 or less I randomly have a hard time starting my car. Some days it is fine some days it takes me 15-20 min. The check engine light is not on. The car will start for a second and then die. The time is stays started will get longer until finally it starts. If I try to press on the gas when it first starts it will immediatly die. The engine will rev on its own (without pressing the gas) then after about 3-5 min of warming up it is fine for the rest of the day. What could it be?
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Re: Hard to start when 30 degress or less out.
Engine coolant sensor and Intake air sensor bad -----tech terms( ECT and IAT) The way to check these you need to hook up a scan tool to the cars computer and both of the readings for these sensor should read the same. If reading is off by 2 degrees that's ok not too off. And it should be in the morning before you start your car up. Thats the time you check it. hope this help
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Pull the battery cables off and let them sit off for about 30secs. If the code comes back on after the battery is disconnected than that means you have a hard code and will have to have the car scanned and reset. There are two kinds of codes, hard and soft, hard codes need to be scanned and reset soft codes are simple issues that by disconnecting the battery the codes will go away.
Try to tightin up the light bulb. be aware the only way to do this is to remove the hole dash. if you do not know how to do this i would recamend you take it to a shop are ask me to go through step by step directions.
have your ignition coil checked, this problem happens when your ignition coil becomes hot and when you rest it cools down and it will work again. you don't repair ignition coil, instead you replace it with a new one.
If turbo in a temperate climate, use 0W40 or 5W40 synth for year round protection. If naturally aspirated, you can use the same or 5W30. If you live a particularly hot climate, 10W40 will work just fine too, and you might even be well off to go to 10W50, at least in the hottest months. Turbos generate a lot of extra heat which contributes to quick long chain molecule shear down in multi- viscosity oils. Accordingly, a 40 wt oil will quickly thin down to something more like a 30 weight oil. Oil pressure in these cars is marginal at idle, so keeping a close eye on good viscosity is pretty important, as that helps keep pressure up.