Peterdroy66
Registered User
90SC Auto Bone stock, has thrown CEL all the time I have owned it and yet never failed etest.
Throwing this out looking for ideas on why ONE side might throw a lean 91 code.
O2 sensor is new/recent.
Maybe going to spray injectors, and LEFT side areas carb cleaner and see if it affects idle speed to look for a vacuum leak on the left side.
Could a Missfiring plug cause this- I woudl think not more likely the opposite but guesssing.
Looked through / searched for similar posts but did not find anything.
PR
Throwing this out looking for ideas on why ONE side might throw a lean 91 code.
O2 sensor is new/recent.
Maybe going to spray injectors, and LEFT side areas carb cleaner and see if it affects idle speed to look for a vacuum leak on the left side.
Could a Missfiring plug cause this- I woudl think not more likely the opposite but guesssing.
Looked through / searched for similar posts but did not find anything.
PR