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2003 Mercury Grand Marquis LS 4.6L Misfire
Posted to Ford Driveability on 6/28/2006 10 Replies

Car came in with a slight jerk or bucking under load. Will also do it in the bay under load. Scanner shows only P0300 as far as codes but Mode-6 shows misfire counts on all but three cylinders! One thing we did discover was however that when you unplug the EGR...

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  Related Documents & Media  2003 Mercury Grand Marquis LS

 
Message Closed w/FIX

car Vehicle Data

2003 Mercury Grand Marquis LS

VIN 2MEFM75W13
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / Electronic Returnless System
EmissionsOBD-II Compliant
SymptomsMisfire
OccursUnder Load
Misc.Coil Over Plug

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/FIX

car Vehicle Data

2003 Mercury Grand Marquis LS

VIN 2MEFM75W13
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / Electronic Returnless System
EmissionsOBD-II Compliant
SymptomsMisfire
OccursUnder Load
Misc.Coil Over Plug

Trouble Codes

P0300Multiple Misfire Detected