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Old 09-20-2009, 01:44 PM   #1
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Tougher start on cooler mornings

My viggen seems to crank more due to cooler weather (mornings). ANyone have possible causes? I can rule out CPS (just did one) Battery getting weak? Plugs? any ideas would be great
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Old 09-20-2009, 03:34 PM   #2
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This is normal for every car ever made. Oil is thicker, battery is cooler, engine block is cooler etc.
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Old 09-20-2009, 04:14 PM   #3
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Turn the key to on but don't crank the engine. You should here the fuel pump prime the stop. Once it stops priming, crank the engine. It should light right up.
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Old 09-21-2009, 10:53 AM   #4
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This is normal for every car ever made. Oil is thicker, battery is cooler, engine block is cooler etc.
Thank you I do understand this.

It happened again this morning. After cranking about 6 or 7 times I turned of the car fully and on restart it fired up right away. I did let the FP prime upon the first start up
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Old 09-21-2009, 05:12 PM   #5
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I'm expirencing the same problem as well except my car wont idle well for the first 10 seconds after starting. Sorta frustrating when the car doesnt fire up after a few cranks
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Old 09-21-2009, 05:18 PM   #6
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This is normal for every car ever made. Oil is thicker, battery is cooler, engine block is cooler etc.
it isn't normal if you really notice it especially with RI weather... -40 degrees sure but if it is only 40 degrees not really.
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Old 09-21-2009, 05:31 PM   #7
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fairly normal for T7 in my experience at least. different fuel sources seem to effect starting as well. i try to stay consistent with sunoco 93.

dave
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Old 09-21-2009, 05:37 PM   #8
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Mine does this every now and again. Kind of embarrassing for a car that cost $45k in its day. By the time I go and borrow the fuel pressure gauge, its fine again. i know my crank sensor was replaced (old one is still under the hood). Some say the 93+ octane is harder to get going on a cold morning.
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Old 09-21-2009, 05:41 PM   #9
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"In its day" was nine years and probably 100+ thousand miles ago. I wouldn't expect it to be a brand new car anymore
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Old 09-21-2009, 05:53 PM   #10
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fairly normal for T7 in my experience at least. different fuel sources seem to effect starting as well. i try to stay consistent with sunoco 93.

dave
My favorite fuel, definately wakes the car up a bit more than any other 91 or some 93 octane gases. Maybe check your plugs or change your oil weight a bit?
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Old 09-21-2009, 06:51 PM   #11
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Quote:
Originally Posted by Smaart Aas Saabr View Post
it isn't normal if you really notice it especially with RI weather... -40 degrees sure but if it is only 40 degrees not really.
If youre in tune with your car you notice the difference between the 60* it has been and the 80* it was before. And when it gets below 0 before the wind chill, its even more noticeable.



As for gas:
93 octane makes cold starts harder. No doubt about it. Octane is the resistance to detonation. Higher resistance from the fuel added to the fact that cold fuel running into a cold block has a similar effect to high octane, and it can get pretty hard to start. The difficulty of gas to vaporize in cold weather is the reason for winter blend gas.
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Old 09-22-2009, 05:41 AM   #12
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My viggen has done this every year in the fall since I bought it in 2002 with 15K miles. So I don't think anything is broken on your car. I've never gotten a clear answer why. Consensus seems to be t7 is fussy about the summer blend of gas in colder weather, since once gas is switched over to winter blend the car starts fine. A bottle of Techron does seem to help a bit.

I haven't found that letting the fuel pump run before cranking makes any difference. But if you let it crank about 3-4 seconds, then shut it off and try again, it should start right up.
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Old 09-22-2009, 09:56 AM   #13
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Quote:
Originally Posted by daveship View Post
fairly normal for T7 in my experience at least. different fuel sources seem to effect starting as well. i try to stay consistent with sunoco 93.

dave
x2.

I was told by my cousin who is one of the top Saab techs in the country that it is due to the ethanol content in the fuel these days.

Everytime I start my Viggen for the first time in the day it cranks and cranks and cranks and then finally stumbles to life.

I often crank it for about 2 seconds, turn the key back, and try again and it usually starts easier.
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