1993 Hyundai Elantra, Idle problems?

Question

Vehicle has a 1.8  16 valve DOHC.   When idling,  it slightly revs up and down and up and down repeatedly.   What could be causing this?    Please..........reputable mechanics or Hyundai techs answer please.  I do believe this is beyond the knowledge of the backyard mechanic.

Heather B · Accepted Answer

idle air control motor probably

brdkncd · Answer

Idle air control is correct



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? · Answer

The intake manifold gasket is cracked inflicting a pretend air signal affecting gas injection and engine timing. seen it many cases. replace the gasket and situation is solved. Spraying carb purifier round searching for an air leak gained't locate the issue yet brake purifier will - it has propane as a propellant and makes the engine react even as the better gas is going into the engine. solid success.

Anonymous · Answer

A dirty crank shaft sensor ,or Mass Air Sensor(MAS)can cause what your vehicle is doing.Don't under estimate the little guy some of them trial and error alot of time and money solving problems like yours.good luck.

Asian PowPow · Answer

That sounds like a vacuum leak to me. listen for hissing under the hood. could be a cool snake.

1993 Hyundai Elantra, Idle problems?

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