May 4, 2012My 2003 F-15o 4.6 motor, with 65,000 miles has a miss when setting idleing ,[ motor rocks on idle]. Runs good down the road without miss. Anybody know what is wrong... THANK YOU...
May 5, 2012I`d check the IAC...........Idle air control valve in back of the motor by the firewall. 2 bolts ( don`t lose them ), spray with parts cleaner. Or just replace. Used to be around $30 when I had my `97.
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May 10, 2012my mechanic Put his machine on it today, says it is cyc. #8 missing , replace plug and spark plug wire , didn`t help did a compression check. cyc. # 8 had 90# and the one next to it had 170 #. He say it has to be A bad valve, suggest to tear it down ,grind valves. Cost around $2300 -+ What do you think???????
January 20, 2013My guy was right , tore it down 3 valves bad & needed new valve seats , Very costly..Had to take cab off to get to motor... Runs good now, but shouldn`t happen with that low miles. I take excellent car of it.Not a very good thing for Ford..I will think twice before I buy another. And I always liked Fords......