If you have a relatively new battery, though, but the engine won’t start, trickle charge your battery by using a 12-volt trickle charger. Fuse and relays. The fuse on your starter circuit, Ignition, EIS, or Fuel Pump should be checked next if the battery is not the issue.
If your vehicle won’t start, it’s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter. It can be hard to determine if you’re dealing with a battery or an alternator problem.
If the engine holds compression well, and the fuel system is working correctly, but it still won’t start, that tells us that your car’s spark plugs may not be working. The spark plugs ignite the air/fuel mixture inside the engine’s cylinders. It’s the resulting explosion that actually powers your car.
What sensors can cause a car not to start?
The most common sensors that will stop your car from starting include the camshaft sensor, the crankshaft sensor, the mass air flow (MAF) sensor, the manifold absolute pressure (MAP) sensor and the throttle position sensor.
What would cause my Mercedes not to start? – Related Questions
Why won’t my car start but the battery is fine?
Bad Starter
If the battery seems fine, the problem may be in your starter. A starter is a small motor that draws electrical current from the battery to start the engine. When a starter fails or malfunctions, you may hear a clicking noise when turning they key in the ignition.
What are the most common engine starting problem?
Dead Battery
A dead battery is the most common reason why engines fail to start up.
Can O2 sensor stop car from starting?
The O2 sensor will not cause the no start. The no start can be caused by the fuel pump or the ignition system. You should check the engine for spark and fuel pressure, when it is not turning on to help narrow the problem down.
If your vehicle has a bad oxygen sensor, it could run irregularly or sound rough when it idles. A faulty oxygen sensor can impact your engine’s timing, combustion intervals, and other essential functions. You could also notice stalling or slow acceleration.
Can a throttle position sensor stop a car from starting?
When a TPS goes bad, then the car’s throttle body won’t function properly. It could either stay shut or it won’t close properly which is a severe issue. If it stays shut then your engine is not going receive air and it won’t start.
Will a temp sensor keep car from starting?
The sensor will not cause a no start. It could cause a hard start and a rich or lean condition only.
What happens if the temp sensor goes bad?
The coolant temperature sensor can fail and transmit cold signals to the computer. This action confuses the computer and stimulates it to enrich the fuel mixture unnecessarily. This can cause the fuel mixture to be vibrant such that during combustion, the fuel can’t be adequately consumed within the chamber.
What happens when a temperature sensor fails?
If the coolant temperature sensor malfunctions, it could cause your car engine to get overheated. While sometimes a faulty sensor sends a permanent cold signal to the engine, it can also send a permanent hot signal.
Can a mass air flow sensor cause a no start?
Mass Air flow Sensor (MAF). As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. In addition, a faulty mass air flow sensor might cause the Check Engine or Service Engine Soon light to come on.
Here are some of the most common symptoms of a faulty mass airflow sensor:
The engine is very hard to start or turn over.
The engine stalls shortly after starting.
The engine hesitates or drags while under load or idle.
Hesitation and jerking during acceleration.
The engine hiccups.
Excessively rich or lean idling.
What are the symptoms of a mass airflow sensor failure?
Stalling, jerking, or hesitation during acceleration
A bad MAF sensor can cause too much fuel to be left in the combustion chamber, creating untimed detonations. You’ll experience this as poor drivability such as hesitations or sudden jerking motions, particularly during acceleration.
How do I reset my mass airflow sensor?
Resetting the Mass Air Flow Sensor by Disconnecting the Battery
Remove the old MAF sensor and replace it with a new one.
Before you connect the sensor with its harness, disconnect the battery from the ground cable.
Leave it like that for around 10 minutes.
The whole system will be reset now.
How do you reset car sensors?
Do I need to disconnect battery to change MAF sensor?
After changing a mass air flow sensor, you should disconnect it from the car battery for around 15 minutes.
What can make a mass airflow sensor go bad?
Contamination is a key reason why MAF sensors fail and require replacement. As air, dirt and other debris get into the sensor, the parts become contaminated and fail. Drivers often notice sluggish performance, rough idling, poor acceleration or even stalling.
What are the symptoms of a bad oxygen sensor?
Signs a Vehicle has a Bad O2 Sensor
Check Engine Light Comes On.
Noticeable Loss of Fuel Efficiency.
Sulfur or ‘Rotten Egg’ smell from Exhaust.
Black smoke from exhaust.
Emission levels reach high levels.
Your engine hesitates, skips, begins bucking or has power surges.