× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
1995 Mercury Grand Marquis LS 4.6L Poor Idle Quality
Posted to Ford Driveability on 12/7/2004 17 Replies

I have this Merc. that likes to surge the idle speed up and down about 100-150 RPM's at stop sign's [...] no difference if engine cold or [...] it will idle just [...] into throttle plate not much sludge buildup. I did replace IAC motor and no [...] if you tap...

17 Replies Received (View Replies)

  Related Documents & Media  1995 Mercury Grand Marquis LS

 
Message Closed w/FIX

car Vehicle Data

1995 Mercury Grand Marquis LS

VIN 2MELM75W8S
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursIdle

Trouble Codes

P0121Throttle Position Sensor Range/Performance
P0505Idle Speed Control System
P1124TP Sensor Signal Too High / Too Low During Self-Test
Message Closed w/FIX

car Vehicle Data

1995 Mercury Grand Marquis LS

VIN 2MELM75W8S
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursIdle

Trouble Codes

P0121Throttle Position Sensor Range/Performance
P0505Idle Speed Control System
P1124TP Sensor Signal Too High / Too Low During Self-Test