Question about 2001 Hyundai Sonata
My 2001 sonata has a problem after i drive it a while. The tach falls to zero and the engine loses power. i let off the gas pedal and the tach goes up to idle and the engine gains power again. when i down on the gas pedal it goes good, but when the engine is at a stedy speed it happens again. It seems to do this after i drive more than five miles. let me know what other information i could give you to help explain this problem
The first thing to look for is a disconnected air hose
The next thing to have tested is your Idle Speed Controller (ISC). The car's computer attempts to control the idle speed by opening or closing the ISC. The valve on the ISC allows extra air to bypass the throttle plate. You'll want to have your ISC tested. Another components that lets air bypass with the throttle body is the fast idle air valve (FIAV). This should only be active when engine is cold, but if it's always open, it can cause stumbling.
Next, the Exhaust Gas Recirculation (EGR) valve should be checked. This valve is located under the throttle body and if it's malfunctioning will cause stumbling.
Posted on Dec 02, 2008
Hi and welcome to FixYa,
The correct procedure for diagnosis calls for scanning your engine management computer for error codes/logs. These error codes/logs would then correspond to a general area where to start checking/replacing. Offhand, your describe problem could either point to:
Posted on Dec 02, 2008
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Posted on Jan 02, 2017
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