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1998 Acura TL Question: Check engine light

 

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Gean, Lawrenceville, GA, June 10, 2010, 11:37
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Diagnostic code P 1491 - Malfunction in EGR System. Check engine light stays on however ports were cleaned one year ago. Light stayed off until one week ago (6/1/10). What is code 1491 exactly.

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    dandd June 10, 2010, 17:32
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    The code P1491 is an EGR Valve Position Sensor code, not a code for plugged ports, so most of the time this means that either a piece of carbon has clogged your valve and it can't close properly or that the Position Sensor on the Valve is worn out. Best to have a savy tech do a scan of the EGR valve data to see if the valve is closing, any idle problems? A sticking valve may cause a rough idle, though the computer will compensate pretty well.

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    Gean, June 11, 2010, 04:54
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    Thank you for this valuable information. I could not get anyone in ATLANTA to tell me this and finding a savy tech is going to be a task. No idle problems as of yet. Twice I notice a sputter while cranking in the morning. Will this cause the use of gas to increase?

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    matte July 13, 2010, 09:14
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    I believe you said that the diagnosis you received was a hold in a hose, which I believe can cause an EGR code.

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