I just had the EGR valve and its controller replaced. I was hoping this would turn off the check engine light that goes on and off periodically. Not only did it not fix the check engine light, but now my car idles rough at stoplights and sometimes just at idle. My mechanic, when he replaced the EGR valve, said as I was leaving that it might take a little time for the valve and the idle to the light to become compatible? Do you know what he was talking about? Thank you.

Answer

I don’t know what exactly he means by “for the valve in the idle to the light compatible.” But, if he disconnected the battery while working on the EGR system, he might be referring to the car’s computer relearning its idle and fuel trim strategy, which usually gets erased when power is disconnected. It erases data from memory.

Also, do you know if he cleared any trouble codes from the computer memory after replacing the valve? If not, you can go to a local auto parts store and ask them to pull any trouble codes (so that you can verify the code relates to the EGR system) and have them clear the memory. This could help. Also, you can wait for the computer to relearn the strategy, which may take a few miles. Or you can check your vehicle repair manual and see if it gives you the procedure to perform the idle relearn process.

Updated on January 5, 2019

Original Article:

Symptoms of a Bad EGR Valve
By Dan Ferrell
working

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