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FixItMan, Master Technician
Category: Car
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Lincoln Aviator: I have a 2004 Lincoln Aviator that has been

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I have a 2004 Lincoln Aviator that has been idling hard when stopped. It occurs when the gas gets below 3/4 a tank. I've had three mechanics tell me that they feel it but can't figure out why. I've had a full tune up. Transmission was replacedand the convertor replaced. I'm out of suggestions and ideas. Any feedback would be appreciated. Thank you
Hello and thank you for your automotive question. I would like to get a little more information from you. Is the check engine light coming on? How many miles are on the vehicle? Does the vehicle run fine at higher RPM's? When you say it idles hard does it idle rough?
Customer: replied 4 years ago.
The check engine light is not on. And has not come on. The vehicle has 136k on it. And yes it is a hard idle like something is misfiring. The vehicle does not misfire at higher rpms, it runs smoother. Also I'm not sure if this is relevant but it has the same hard idling when the ac is on. And this is at all rpms. Ill have to take my foot off the gas and then reapply for it to stop. This occurs multiple time while driving.
Customer: replied 4 years ago.
Relist: I still need help.
Sorry for the delay in getting back with you. The system did not inform me that you replied. I would still like to help you if you still need help.
Customer: replied 4 years ago.
Yes please
Okay. There are some common issues that will cause this on this engine. Two are not that serious and one is. The first thing that should be done is cleaning the throttle body and the idle air control valve. It is common for either or both of these to have carbon build up and cause this idling condition. The other common problem is within the valvetrain on this engine. It is common for the valve seats to fail and begin to leak which can cause low compression at idle. If this is the case then the cylinder heads will need to be removed and rebuilt for a cost of probably at least $1000. A compression test would need to be done to verify this. I hope this information helps you, and again I am sorry for the delay. Please let me know if you need any other information.
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Customer: replied 4 years ago.
Thank you ill be telling my next mechanic this and hopefully they actually listen. :) thank you so much for your time!
No problem. Please let me know if you need any other help.