My '90 325is failed emissions testing twice because of high CO levels. I assume this means the car is running rich. I put some of the CRC "guaranteed to pass" in the tank and that did not help the second time.
The car runs well and I get about 24mpg combined. It does have a slightly rough idle and will sometimes idle high (1k rpm) until I blip the throttle. It drops back to the normal, slightly rough idle after blip. I assume this is caused by a vacuum leak so I checked my intake hoses and found no damage. I also tried the propane test while the engine was running and was not able to find a vacuum leak.
At one point, I did have a stored code (no CEL) 1222 but upon recent stomp test, the code is no longer displayed.
Sometimes the car will take a few more cranks than usual on a hot start and will sort of sputter to life. It will still idle the same though. Also, a few weeks ago I did hear a whining from the fuel pump area although that no longer occurs.
Can anyone help me diagnose my rich running condition from these symptoms?
I have attached a picture of my vehicle emissions inspection report.
The car runs well and I get about 24mpg combined. It does have a slightly rough idle and will sometimes idle high (1k rpm) until I blip the throttle. It drops back to the normal, slightly rough idle after blip. I assume this is caused by a vacuum leak so I checked my intake hoses and found no damage. I also tried the propane test while the engine was running and was not able to find a vacuum leak.
At one point, I did have a stored code (no CEL) 1222 but upon recent stomp test, the code is no longer displayed.
Sometimes the car will take a few more cranks than usual on a hot start and will sort of sputter to life. It will still idle the same though. Also, a few weeks ago I did hear a whining from the fuel pump area although that no longer occurs.
Can anyone help me diagnose my rich running condition from these symptoms?
I have attached a picture of my vehicle emissions inspection report.
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