|
If the EGR is leaking you will be lean which will cause the pinging, the computer will pull timing and richen it up which will lead to the rich condition. The computer doesn't know the extra air is getting in and can't really compensate for it correctly. Same thing would happen if the EVAP purge was leaking, but there might be a sensor that can detect the flow in that situation, I'm not sure.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
|