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  #1  
Old 04-10-2004, 09:59 AM
Evan's Avatar
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Join Date: Nov 2003
Location: Fairhaven MA
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Car runs better when cold?

I have a 1991 300E,, for some reason when i drive the car cold it seems to have more power and seems to run MUCH smoother.. When its warm it seems to lag more and be a little less aggressive with the power delivery.. any ideas?

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2001 Mercedes-Benz C320 3.2
1991 Mercedes-Benz 300E 3.0
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Old 04-10-2004, 12:28 PM
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Location: Southern California
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When cold the engine runs richer. When warm it operates in "closed loop mode" - the O2 sensor feedback is used to maintain stoichiometric fuel-air ratio. This usually manifests as slight idle roughness, but the engine should respond well to throttle inputs.

Duke
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Old 04-10-2004, 02:05 PM
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Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,830
Here's a list of things I would check:

- throttle body bore, make sure it's clean
- egr valve, make sure it closes properly
- injectors could be dirty
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Old 04-10-2004, 02:40 PM
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cold air is denser than hot air, and denser air carries more oxygen with it.

that's the reason we install cold-air intakes ...

however, cold air also produces more aerodynamic drag ...

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