Sevice Engine Soon? Help
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From: Lake Havasu City, AZ
Sevice Engine Soon? Help
Left work today to go home and after starting my 1999 Super Duty V10 with 86,000 the Service Engine Light appeared. It never went off my whole drive home. Anyone know what could be causing this light to come on? I was thinking maybe the O2 sensor but not sure. Truck still runs good and smooth and power is also all there.
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From: Lake Havasu City, AZ
Originally Posted by ford390gashog
check your gas cap.do you have a autozone by you ,if you do go there and they will pull the codes for you for free.
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From: Vancouver Wash USA
Originally Posted by riverratmike
well nothing to do with the gas cap. I have restarted the engine about 4 times since the light first came on and it's still lit up.
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From: Lake Havasu City, AZ
thanks for the info. well today leaving work I noticed when my truck has been sitting in the hot 125 degree sun for some period of time. I turned the ignition to leave work and hear a funny noise. Sounds like a release of air-pressure of some sort. Just does it for a split second right when the engine first fires. I noticed it also yesterday and that's when the light came on.
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From: Lake Havasu City, AZ
well took my super duty in today. just got it back. the reason for the service engine soon light coming on was the EGR valve being stuck. What does EGR stand for?
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From: Lake Havasu City, AZ
Originally Posted by boxcar1974
Exhuast Gas Recirculator
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Definition: The EGR valve is the main emissions control component in the exhaust gas recirculation system. The valve is located on the intake manifold, and opens a small passageway between the exhaust and intake manifold to allow a metered amount of exhaust to flow back into the engine. This reduces combustion temperatures and helps control the formation of oxides of nitrogen. The EGR valve is opened by the application of vacuum to its control diaphragm. Some also require a certain amount of exhaust back pressure before they'll open. On newer vehicles, the valve is electronic and uses one or more solenoids or a small stepper motor. The valve should remain closed while the engine is cold and at idle. It should only open once the engine has warmed up and is running at part-throttle. If the valve sticks shut (or is disconnected), NOX emissions will soar and detonation will often result (See Detonation and Spark Knock). If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.
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From: Lake Havasu City, AZ
Originally Posted by boxcar1974
Definition: The EGR valve is the main emissions control component in the exhaust gas recirculation system. The valve is located on the intake manifold, and opens a small passageway between the exhaust and intake manifold to allow a metered amount of exhaust to flow back into the engine. This reduces combustion temperatures and helps control the formation of oxides of nitrogen. The EGR valve is opened by the application of vacuum to its control diaphragm. Some also require a certain amount of exhaust back pressure before they'll open. On newer vehicles, the valve is electronic and uses one or more solenoids or a small stepper motor. The valve should remain closed while the engine is cold and at idle. It should only open once the engine has warmed up and is running at part-throttle. If the valve sticks shut (or is disconnected), NOX emissions will soar and detonation will often result (See Detonation and Spark Knock). If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.
weird, once the light did come on the truck still ran normal, well at least I couldnt tell any differance the way the truck ran. Thanks for your reply
