How do you fix a lean fuel trim?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
How is rich fuel mixture diagnosed?
Bad smell: One of the common symptoms of a rich engine is a strong smell of rotten egg from your exhaust pipe. This awful smell is caused by an excess amount of unburnt gas in the exhaust pipe. The catalytic is burning fumes, but if the air-fuel mixture is very rich, it won’t burn all the unburnt gas.
What does rich and lean mean?
Lean or Rich Mixtures When an air/fuel mixture has too much fuel, it is rich. When there is not enough fuel, it is lean. An AFR higher than stoich = lean. An AFR lower than stoich = rich.
What happens if air-fuel ratio is wrong?
Yes, an incorrect air-fuel ratio can cause engine oil to go black. Specifically, a rich condition pushes smokey, un-burned fuel exhaust past the piston rings that gets absorbed by the engine’s crankcase oil. If your O2 sensors are really faulty, however, you will have a Check Engine light illuminated on the dashboard.
How do you adjust the fuel mixture in a Toyota?
Loosen the clamp screw and rotate the gear wheel a few teeth as necessary. Clockwise leans the mixture, counter-clockwise richens the mixture. After adjustment, replace the top plastic lid (see Warnings below). WARNING #1 – Use caution when cutting the top lid seal with a hobby knife so that plastic lid is not cut or damaged.
What’s the trouble code number on a Toyota?
For example; if the check engine light blinks once and pauses followed by six blinks the trouble code number would be 16. If no code is present the check engine light will stay on constantly, to restart code gathering turn the ignition key to the “OFF” position, wait three minutes and turn the ignition key back “ON” again.
What are the trouble codes for Toyota 22RE engines?
Early 22RE engines: CODE DESCRIPTION / PROBABLE CAUSE (S) 1 Normal operation (no code stored) 2 Open or shorted Air Flow Meter (AFM) cir 3 No signal from igniter 4 times in succes 4 Open or shorted Water Thermo Sensor (THW