Surging on starting, 2001 Elantra.

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Cold weather?

My 2002 SantaFe, 2.7 litre, used to immediately rev to 2000 rpms on startup in extreme cold weather. I never liked this because the oil is thicker when the car is first started., so, I located the Idle Speed Solenoid on top of the engine, took it off , and put a piece of tiny sheetmetal on the flange and punched 2 smaller holes into the metal , then reattached the Solenoid . Now it revs to 1,000 rpms when first started . But, i suspect your problem is not related to the Idle Speed Solenoid Control. Ill bet it is a function of the computer or an irratic sensor .

Thanks for the answer, I suspect you are right about the sensor/computer, it has settled back to 'normal' the last few days.

My 2002 SantaFe, 2.7 litre, used to immediately rev to 2000 rpms on startup in extreme cold weather. I never liked this because the oil is thicker when the car is first started., so, I located the Idle Speed Solenoid on top of the engine, took it off , and put a piece of tiny sheetmetal on the flange and punched 2 smaller holes into the metal , then reattached the Solenoid . Now it revs to 1,000 rpms when first started . But, i suspect your problem is not related to the Idle Speed Solenoid Control. Ill bet it is a function of the computer or an irratic sensor .

The throttle position sensor is a common failure on this year Elantra. If it reads too high a voltage, the RPMs may be excessive and the automatic transmission may shift at odd times.

I've also seen some leaking intake manifold gaskets, but they don't usually fix themselves.