Saab - 900 :: 1996 Won't Start In Cold Temperatures
Mar 2, 2011
I've had my '96 Saab 900S for almost 6 years and it has 119K miles. Last weekend w/ the below freezing temperatures, she decided not to start on me again. I'll reiterate the word "again" as this non-starting problem happens once or twice every winter, when the temperatures are very cold, usually 20 degrees or colder. I've taken it to the mechanic who doesn't know why it continues to do this to me every winter during a really cold spell. As soon as the weather warms up 30 degrees or higher, the car starts up fine w/in a couple tries. During the non-starting fiscal the car will turn over, but then just dies, as if it is "starving for fuel".
On a few occasions I've tried the "cold start", or pushing the gas pedal while turning the engine on for 5-10 seconds, and then trying to start the car normally right after. This has worked on occasion in the past, but isn't a sure bet, this last weekend it didn't work. Recent work includes new battery, distributer cap and rotors, spark plugs, fuel line checked out "ok", and fluid changes are regularly maintained. Does it sound electrical or mechanical? No check engine light comes on so it makes it hard to diagnose. As this car was built in Sweden, it shouldn't be so temperamental in the below freezing weather every winter.
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I just put a new battery in today, the alternator is newer, fuel pump is newer, new plugs and wires. I am leaning towards the coolant temp sensor gone faulty. I was wondering, where it is located to on the engine so I can change it out.
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I noticed that the coolant temperature will also drop a bit when I'm sitting idle listening to the radio before heading into our building at work. From about 85C to 70C, and the vents blow cold air.
My Radiator & Expansion tank are filled to proper level. I have just installed some cardboard inside the grille to try and block some of the cold air from entering. I haven't tested this out yet though.
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I have a beautiful 1996 Saab, 900s. Recently the check engine light came on and at Autozone they said the code was for the secondary air injection pump. I took it to a new mechanic, he checked it out and called me to say the pump itself was broken and would cost 1,000 to fix. I said that was a lot, and would think about it, and picked up my car.
Strangest thing- the check engine light is now off! Is this normal? And I just took the car in for the state inspection, it passed! I was under the impression a car without a working secondary air injection pump can't pass emissions. What is going on here??
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When starting, especially in colder temperatures, the engine start is interrupted by a "thud" sound. The start occurs after this one-second "interruption" while I keep the key in the start position. This interruption occurs only once, usually when first starting in the morning. Subsequent starts are normal,unless the car has not been in use for a few hours. Then the "first start" problem re-occurs. The starter motor has been replaced. No improvement.When the problem first began a few months ago, very intermittently, the gauges in the dashboard would not register as would normally happen and I could hear a whirring sound for a few seconds. Then the gauges would perform as normal. This is a 2004 Taurus with mileage of 64,000.
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