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Old 11-27-2008, 06:48 AM   #1
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Engine not idling... cuts off at stop lights..

I have to keep car in neutral with RPM's cranked when coming to a stop... car has run great for years... & this just started happening for no particular reason... before I take it to dealer (for a $400 whatever), wondering if it makes sense to run some high octane gas thru (I always use 87) and some fuel additive of some sort... or is that just a waste of time? I appreciate your thoughts...
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Old 11-27-2008, 07:03 AM   #2
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Could be a vacuum leak. Though being a T8 car, you could have CEL if that were true.

Not sure what else.
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Old 11-27-2008, 09:33 AM   #3
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Quote:
Originally Posted by dshiple View Post
I have to keep car in neutral with RPM's cranked when coming to a stop... car has run great for years... & this just started happening for no particular reason... before I take it to dealer (for a $400 whatever), wondering if it makes sense to run some high octane gas thru (I always use 87) and some fuel additive of some sort... or is that just a waste of time? I appreciate your thoughts...
Check your spark plugs and DI

Also, put a can of seafoam in your gas tank when you are close to E, then fill up with premium.
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Old 11-27-2008, 07:11 PM   #4
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I thought T8 cars don't have DI cassettes? Could be something wrong with your idle air control valve, but then again T8 would probably throw a code. Is your car auto or manual?
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Old 11-27-2008, 08:43 PM   #5
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Oh never mind, I was thinking about the newer 9-5s. Never mind
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Old 11-30-2008, 11:16 AM   #6
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T8 doesnt have an IAC. sounds like a throttle body failure. codes would be nice..
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Old 12-02-2008, 11:54 PM   #7
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I've heard bad (and I guess good, for that matter) things about seafoam.

I think the manual says use 91 or higher octane. Check it out. I was saying in another thread that I was forced to use 89 for a day and the car seems to hesitate more. It's much smoother with premium.

Other than that, I'd check plugs first - even before getting a code pulled just because it's simple to do. Fouled plugs can be found via google search so you know if yours look good or not.
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Old 12-03-2008, 03:16 AM   #8
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plugs really only cause starting issues in these cars but i guess its worth a try i highly doubt it will fix your car tho

please dont do sea foam this is a sport sedan not some 200k plus c900 that hasnt been taken car of for 15+ yrs

codes will answer your question GET THEM FIRST!!!! 9-3SS trow a code for looking at it wrong
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