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evilmustang · 01-14-2001, 07:56 AM

Hi, thanks for reading. I have a 90 LX coupe 5.0 T5 with 110,000. My car is having an idleing problrm, on the rpm the needle constantly moves up and down (1000-500rmp) when i come to a complete stop or when its idleing. I read the computer codes and it gave me code KOER 91. I replace the 02 sensors and no help. The power as i'm driving doesn't seem affected, it's just when its idleing where the problem is noticed. If anyone has a suggestion please let me know. Thanks in advance, Rick

01-14-2001, 07:56 AM	#1
evilmustang Registered Member Join Date: Jan 2001 Location: compton, CA, USA Posts: 63	Idle problem (KOER code 91) Hi, thanks for reading. I have a 90 LX coupe 5.0 T5 with 110,000. My car is having an idleing problrm, on the rpm the needle constantly moves up and down (1000-500rmp) when i come to a complete stop or when its idleing. I read the computer codes and it gave me code KOER 91. I replace the 02 sensors and no help. The power as i'm driving doesn't seem affected, it's just when its idleing where the problem is noticed. If anyone has a suggestion please let me know. Thanks in advance, Rick