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?

A: Hi there. This happens frequently on this v...

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・Save up to 30%

Get a quote

What others are asking

Q: Don't have a owner manual needing number for the park light and dash lights fuse

The parking lights have power from fuse number 17 and is a 15 amp fuse. The headlight switch and parking light relays are powered from this fuse. You should first verify fuse is good then test light switch and parking...

Q: My car trembles or idles hard when I'm at a temporary stop. It feels like the car wants to move before I'm ready.

This problem may be related to a dirty or faulty idle air control valve. This valve is a unit that reads the air intake as it is mixed with fuel, prior to being injected into the motor. The computer then...

Q: Brand new motor will not start

Hi there. From the description you have provided, changing the vehicle engine, shorting the alternator and now a no start, is going to require proper diagnoses. The computer recognizing a fault in the auto shutdown relay circuit, is encouraging, the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...