Your 1999 Ford F-150 may be running rich due to several potential issues, such as a malfunctioning fuel injector, a faulty mass air flow (MAF) sensor, or a clogged air filter that restricts airflow. Additionally, problems with the engine's oxygen sensors can lead to incorrect fuel mixture adjustments. A leaking fuel pressure regulator could also cause excessive fuel delivery. It's advisable to conduct a diagnostic check to pinpoint the exact cause.
Sparkplugs... Give it a tune up.
Computer failure?
My 1998 suburban right side is running rich. I was hoping to find a soulutin to your question Mike
check your vacuum line's!
it just means that the o2 sensor before the catalyst is defective or compter isn't getting a reading. the engine is consequently running rich(burning much more fuel than necessary)
A 1999 Ford F-150 Triton 4.6L running rough and smelling like rotten eggs likely indicates a problem with the catalytic converter, which can cause improper exhaust flow and lead to a rich fuel mixture. The rotten egg smell is typically sulfur from the catalytic converter not functioning correctly. If the check engine light is not illuminated, it might be due to a malfunctioning sensor or a failure in the onboard diagnostic system. It's advisable to have the vehicle inspected for trouble codes and exhaust system issues.
CHECK FUEL PUMP REGULATOR, I HAD THE SAME.
YES it will. It will either run RICH or LEAN. Must repair.
A 1999 Ford Escort may be running rich due to several factors, including a malfunctioning fuel injector that delivers too much fuel, a faulty mass airflow sensor that misreads the amount of air entering the engine, or a defective oxygen sensor that fails to regulate the air-fuel mixture properly. Additionally, issues like a clogged air filter or a malfunctioning fuel pressure regulator could contribute to the problem. It's essential to diagnose the specific cause to ensure proper repairs and restore optimal engine performance.
The oxygen sensor sends s signal to the computer when the engine is running to rich or lean. If you have it scanned for codes then it will tell you what is happening. The oxygen sensor does not have to be bad to set a code. It could be as simple as a vacuum leak. It is best to see a technician and have him diagnosis it than to replace parts that are good.
Sounds like it's running rich do to choke if it's actually smoke & not due to air temp.
Excess gas coating? Do you mean unburnt fuel is entering the converter? If so, then the fuel/air mixture is too rich, or you have a cylinder that is not firing.