Do you lose power running lean?
Your car will have less power than it had before. This is a result of less fuel in the ignition chamber than the car’s computer expects, and the power generated by the engine will be lower than usual. If you car is running extremely lean, you can sometimes even experience backfires, or popping when decelerating.
How do you know if you’re running too lean?
Running lean, on the other hand, refers to when a car’s engine receives too much air and too little fuel. When this occurs, you may notice symptoms like sluggish acceleration as well as jerking. Some of the most common causes of a lean-running engine include clogged fuel injections, bad fuel pump and a vacuum leak.
Is my carb rich or lean?
If the insulator near the plug tip is a nice light tan colour then it’s running approximately correct at that load/rpm. If they’re white then it’s running lean, if they’re a dark brown or worse colour then it’s running rich.
What’s the problem with Nissan Maxima code p0171?
A Nissan TSB for Nissan Maxima dated March 2004 mentions replacing an air/fuel sensor as a solution for the code P0171. Another Ford TSB for a number of late 90-s Ford vehicles describes a problem with MAF sensor contamination where both codes, P0171 and P0174 would appear together.
What causes an engine to run lean for a long time?
Long-term fuel trim (LTFT) There is also a long-term fuel trim (LTFT), which is a long-term compensation of the base air/fuel ratio. For example, if over time, the engine gradually develops a small vacuum leak, it makes the engine run leaner (more air and less fuel).
How does the PCM adjust the long term fuel trim?
In a long term, the engine computer (PCM) will compensate this condition by adjusting the long-term fuel trim (LTFT) to add more fuel. The long-term fuel trim is also displayed as a percentage with a “-” or “+” sign in a scan tool.
Can a vacuum leak cause a Nissan Maxima to idle?
Nissan Maximas with a vacuum leak can idle very rough, like the engine is struggling while the car is stopped at traffic lights. A vacuum leak can also cause the engine to idle at a higher than normal rate, around 2,000 RPMs or higher.
Can you hear a vacuum leak in a maxima?
In some cases, the Maxima’s vacuum leak may be in just the right area or large enough that you can hear it. If you hear a hissing noise under the car’s hood that is similar to a fast leak on a bicycle tire, it is a sure sign of a vacuum leak.
A Nissan TSB for Nissan Maxima dated March 2004 mentions replacing an air/fuel sensor as a solution for the code P0171. Another Ford TSB for a number of late 90-s Ford vehicles describes a problem with MAF sensor contamination where both codes, P0171 and P0174 would appear together.
Long-term fuel trim (LTFT) There is also a long-term fuel trim (LTFT), which is a long-term compensation of the base air/fuel ratio. For example, if over time, the engine gradually develops a small vacuum leak, it makes the engine run leaner (more air and less fuel).