Skip the auto shop - Our mechanics make house calls

Q: Battery jumped, but idling, missing, goes up/down

asked by on

Since my battery died several weeks ago, it doesn’t work well. It idles, goes up/down, & has a miss in it. When my mechanic jumped the battery, he reset the computer and codes because the ‘check engine light’ had been on. For a while it will run okay, but then go back to the idling, missing, and up/down. Could the plugs/coils or the emissions have anything to do with the problem?

Hi there. This happens frequently on this vehicle when there is a loss of power. I usually start by checking the fuses to make sure that none of them failed during the jump. If they are fine then I scan the computer for codes to see why the check engine light is on. That will give me most of the information that I need. It may be as simple as the throttle body needing to be cleaned. It resets when the battery loses power which makes it hard for the computer to control the idle of the vehicle. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the source of the issues.

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: So I had my car washed and then when I tried to turn it on, it says that traction control is off. It doesn't turn on.

Hi there. It sounds like you have a dead battery. If the battery is low enough then the vehicle will act like this. I would usually start by checking the battery. A load test would indicate that the battery is...

Q: car stalling,and running hot and idling up high. 1996 Toyota Camry

Hello. If your car is running hot, this needs to be addressed first. If there are other problems with your car, you can't diagnose them without being able to run the motor without overheating. If it is shutting off from...

Q: Engine swap with Ej20x, Ecu question

I will describe a scenario that will work and you can then judge your actual circumstances based on that. The initial issue is not the "country of origin" but rather whether the block and heads are identical, in every respect,...

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.