If your 1991 Mercury Capri with a 1.6L engine smells rich, it may indicate that the engine is running too rich, meaning it's getting too much fuel relative to air. This could be due to a faulty fuel pressure regulator, a clogged air filter, or issues with the fuel injectors. Additionally, check for vacuum leaks that could affect the air-fuel mixture. Addressing these issues should help lean out the fuel mixture and reduce the rich smell.
Fuel filter
1.they drink capri sun 2. lean cuisine
A vacuum leak can cause a lean burn.
Fuel system lean bank number 2Fuel system lean bank number 2
lean bank 1 lean bank 2 fuel trim limits reached
The code PO174 on a 1999 Mercury Cougar indicates a "System Too Lean (Bank 2)" error, meaning the engine control unit (ECU) has detected that the air-fuel mixture is too lean on the second bank of the engine. This can be caused by issues such as a vacuum leak, a faulty mass airflow sensor, or fuel delivery problems. It's important to diagnose the underlying cause to ensure proper engine performance and efficiency.
basicly its changing the mixture of fuel/air to improve performance
An engine runs too lean when there is an insufficient fuel-to-air ratio, meaning there is more air than fuel in the combustion chamber. This condition can be caused by a variety of factors, including a malfunctioning fuel injector, a clogged fuel filter, a vacuum leak, or a faulty mass airflow sensor. Additionally, issues with the fuel pump or a weak fuel pressure regulator can also lead to a lean condition. Running too lean can result in poor performance, overheating, and potential engine damage.
51** Fuel System Lean A lean air/fuel mixture has been indicated by an abnormally rich correction factor
Fuel injection system fuel trim too lean (Bank 2)
Give engine more fuel
1999 Ford Taurus. System Adaptive fuel too lean banks 1 and 2. How can I fix these.