Skip the auto shop - Our mechanics make house calls

Q: 1. Car jerk 2. Battery

asked by on

After driving 30-40mins perfectly my car starts jerk while i guess 2nd gear change and low performance as well on pickup after that i stop my car and off engine and start again its work again smooth for 30-40mins then again its start jerk.

And

While driving car sometimes near meter i see battery icon and engine stop and some time battery icon blinks many times but car working perfectly plz note my battery wires are fine and i placed new battery...

My car has 320000 miles.
My car has an automatic transmission.

The jerking reaction may be related to what is known as the mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this is dirty or faulty, this causes an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bot of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel.

The battery icon suggests you have some kind of failure or problem with your charging system. This consists primarily of your battery, alternator and voltage regulator. the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. I would suggest having a professional from Your Mechanic come to your location to take a look at your vehicle.

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

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 dies while driving - 1993 Ford Thunderbird

You need to check the large fuse links at the harness from the alternator to the battery. If the fuse link is blown the battery will not get charged. If you are having trouble pinpointing the problem, a local expert...

Q: Exhaust manifold leak gaskets

The heat generated by this engine at the higher power levels required to haul these rigs around causes much more expansion and movement of the exhaust manifold relative to the block. The manifold expands, and either cracks, or warps, and...

Q: My 2004 suburban has D 3 2 1 what should I drive in D or 3

The computer controlled automatic transmissions in today's vehicles are designed to be completely intuitive. You will not gain any performance advantage, or gain in fuel economy, by driving around town with the shifter in the 3 setting. For the best...

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...