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1990 Mercury Cougar LS 3.8L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on,
Posted to Ford Driveability on 9/11/2004 22 Replies

Hi guys,

I got a real beauty here. The car runs rough and pops through the intake. The KOER test flags "both banks rich" codes.

Looking at the O2 waveform you can see that the sensors are not switching. They read rich and I can't seem to get a lean signal ev...

22 Replies Received (View Replies)

  Related Documents & Media  1990 Mercury Cougar LS

 
Message Closed w/Summary

car Vehicle Data

1990 Mercury Cougar LS

VIN [No VIN Available]
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic
DeliveryFI / SEFI
EmissionsOBD I
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp On,
OccursAlways

Trouble Codes

42Left bank rich KOER
92Right bank rich KOER
Message Closed w/Summary

car Vehicle Data

1990 Mercury Cougar LS

VIN [No VIN Available]
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic
DeliveryFI / SEFI
EmissionsOBD I
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp On,
OccursAlways

Trouble Codes

42Left bank rich KOER
92Right bank rich KOER