Skip the auto shop - Our mechanics make house calls

Q: Car problems pinpoint issue based on symptoms.

asked by on

Slightly low idle when stopped. Accelerating is slow and steady hesitant can't depress gas pedal all the way just a little or causes the car to sputter chugs sometimes jerk. Occasionally the car won't have any power or turn over when I put the key in and turn then I pull it out couple times it starts right up. Loss of power on incline. When at highway speeds car runs fine slow accelerating. CEL is on. Codes come back MAF and cylinder 4misfire could be faulty that's why I want advice on symptoms themselves. No abnormal noises are heard. What is most likely causing the problems combined.

The Mass Airflow sensor is most likely the cause of your issues. If the sensor fails to give the computer accurate readings, the engine will have a misfire. This is likely the cause of the second code you are receiving. You may want to start by removing the sensor and cleaning it. The sensor can become dirty and have collect build up which skews the readings it sends to the computer. Clean the unit, reinstall it, clear the troubleshooting codes, and then test drive. If the code sets again, you will need to replace the sensor. For exact instructions for the removal and cleaning of the unit, you will want to look for your SPECIFIC make and model. These can be found online or in a repair guide.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car jerking when accelerating from stop.

The valve covers on these engines are known for leaking oil into the spark plug holes. The seals are part of the valve cover and may need to be replaced. A qualified mechanic, such as one from YourMechanic, can check...

Q: Car hesitates while accelerating, EGR valve is a recurring issue - 1999 Isuzu Amigo

Hello. If replacing the EGR valve did not fix the issue, then the EGR valve was likely not the failed component. I would check to make sure that there are no exhaust leaks in the EGR system, as any of...

Q: Car vibrating/shaking when idling

This may be related to an idle air control valve or potentially low fuel pressure. The idle air control valve monitors air intake as it is mixed with fuel prior to being injected into the motor. When this is not...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...