Why does my car lose power for a second when starting?
A momentary power cut during ignition is typically caused by a failing ignition switch, a weak battery connection, or an aging starter solenoid that momentarily drops voltage under heavy load. This intermittent electrical blip stops you from knowing whether it is a harmless quirk or an early warning sign of a complete no-start leave-you-stranded failure.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Replacing the ignition control module
- 2Testing the battery and alternator
- 3Inspecting exhaust manifold connections
- 4inspecting the starter visually
- 5taking the starter off to look inside
- 6attaching a video of the noise
- 7Testing the battery
- 8Checking if the battery terminal is loose
- 9Visiting an auto parts store to ask for a battery test
- 10Replacing the battery
- 11Testing and cleaning grounds and terminals
- 12Checking the starter relay
- 13Using a jump start when it slow cranks
- 14Disconnecting the battery briefly to reset
- 15Guessing potential failing components such as the fuel filter, fuel pump, or distributor cap
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“It seems like a battery or ground issue but I've tried replacing the battery and testing and cleaning grounds and terminals.”source ↗
“Having trouble diagnosing issues with a 2005 buick lesabre. 3.8 V6 auto. When turning the key, the power cuts off for a millisecond before starting and then the car runs fine.”source ↗
“Car starts perfect 95% of the time, but 5% of the time I can hear the starter spinning a but too long AFTER I startup.”source ↗
“I haven’t no!! I don’t know how I would do that lmaoo😭😭”source ↗
“Im having the same problem in an 04 pt cruiser. Runs fine and randomly stalls coming up to a stop.”source ↗
“It takes an extended crack time to start the car but once its starts it runs without issue.”source ↗
“Not sure if it’s fuel filter, fuel pump or maybe even the distributor cap.”source ↗
“So my 2019 Honda HRV started doing with this yesterday😭 idk if it’s the battery or alternator if anyone has any idea!!”source ↗
Where this came up
People with this problem also raised
- 54Vehicle cranks after fuel pump replacement but won't start
- 7Car won't start or shift gears after dead battery
- 11Intermittent car hesitation with no trouble codes
- 28Why does my car make a loud rattle when starting the engine?
- 7Thermostat showing low voltage and no power
- 9Car won't start after replacing ECU and electronics failed