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If its a Ford-The IAC motor is Dirty & can B Cleaned.

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โˆ™ 2005-01-10 17:51:51
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Q: What makes the engine idle speed go up and down when cold?
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Cold oil when you first start the engine will have lots of pressure then it will settle down as the oil warms and thins out.

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Why does car engine shut down when its cold?

Don't know how cold your cold is but, it could be water in the fuel system (ice).

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Surging is the condition where the engine power fluctuates up and down with a continuous, soft jerking motion. When driving at a steady speed, the engine seems to speed up and slow down, without moving the accelerator.

Why would your car idle high when cranking?

if the engine is cold the computer says I'm cold so rich up the mixture and speed up the engine via TPS. then once the engine warms up another sensor tells the computer it has warmed up and decrease the TPS signal slowing the RPM down.

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Why does your car engine have a burning smell?

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