View Full Version : 2003 grand marquis rough idle
tableclocks
Dec 12, 2012, 02:08 PM
2003 grand marquis 52,000 miles... just now developed a small rough idle
No ck engine lite comes on... standard small v-8.. help please? Richard
TxGreaseMonkey
Dec 12, 2012, 02:16 PM
. Install new Motorcraft platinum spark plugs.
. Clean the throttle plate and throttle body.
. Clean the Idle Air Control Valve (IACV).
. Replace air filter and clean air box.
If the problem persists, focus on the MAF Sensor.
tableclocks
Dec 12, 2012, 04:09 PM
. Install new Motorcraft platinum spark plugs.
. Clean the throttle plate and throttle body.
. Clean the Idle Air Control Valve (IACV).
. Replace air filter and clean air box.
If the problem persists, focus on the MAF Sensor.
Thank you v much