Last post on Jun 03, 2010 at 1:36 PM
You are in the Ford Crown Victoria/Mercury Grand Marquis
What is this discussion about?
Ford Crown Victoria, Mercury Grand Marquis, Sedan
#4 of 5 Re: 2005 Mercury Grand Marquis Rough Idle [lemko]
May 10, 2010 (2:16 pm)
Without illuminating the CEL, but with 86k, it would not surprise me if it needed new plugs and wires.
#5 of 5 Re: 2005 Mercury Grand Marquis Rough Idle [lemko]
Jun 03, 2010 (1:36 pm)
Sounds like one of two things. Either a COP (coil on plug), or a fuel or head temp. sensor. When the car stalls do you have to let it sit for a while (cool off time)? if so its probably the head temp. sensor. If not a dwnld of ecm will show a bad coil, or fuel temp. sensor. Auto zone will dwnld. for free. These sensors don`t always set off the check engine light, so don`t rely on that. Hope this helps, Jim.