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Old 09-26-2009, 11:51 PM
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Join Date: May 2005
Posts: 12
1995 MERCEDES S320 failed emission in HC at Idle

My 1995 Mercedes S320 failed the emission test on HC(ppm) at idle. The limit is 220 and my car is 396. I passed at cruising but failed at idling. Can you help what cause this.
I am afraid the dealer will rip me off by saying eveything is wrong. They are hungry for business now.
Thank you for you help.

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Old 09-27-2009, 01:29 AM
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Join Date: Dec 2006
Location: beautiful Bucks Co, PA
Posts: 961
Could be a number of causes.
Dirty air filter
In need of oil change
Engine not up to temperature-most likely
Inept inspection station

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