Quote:
Originally Posted by 80stech
There is a ton of stuff that can cause this but often overlooked is a missfire due to a weak coil or poor spark plug. A compression test would probably be a good idea. Worn valve guides could be another issue.
|
This is a good point. Misfires can be read as too rich, causing the car to lean out until it causes more misfires in other cylinders.
Injectors are a potential cause there too. A LEAN misfire looks like a RICH condition to the O2 sensor.