Mechanics

FORD THUNDERBIRD ENGINE PROBLEM

1996 Ford Thunderbird • 123,000 miles

There is a sound coming from the engine area that can best be described as a fog horn. This problem occurs mainly when the engine is cold and sometimes at operating temperature. I notice the volts gage dips, car runs rough and then recovers when this problem is occuring when at idle. There are no CEL issues however. When I step on the gas the sound disappears. There is a slight rough idle as well. Could this be a faulty IAC and/or EGR Valve or something else?
Thanks for the help!
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March 19, 2013.



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