Skip the auto shop - Our mechanics make house calls

Q: Trouble starting when the engine warms up, humming noise

asked by on

When I try to start the car in the morning after it sat for the night and the engine is cold, it starts immediately and runs great. However, after the engine is warmed up, it develops starting problems. If I drive it and park it for a short while and attempt to start it again, it would take me about half an hour to restart the car. When I continue driving, it would make humming sounds as well. Moreover, the dashboard keeps showing the service engine soon warning on and off. The battery checks out fine. What is causing this?

Thanks for writing in about your 2000 Saturn LS2. This sounds like an ignition module or a starter problem. When the ignition module or starter are subjected to extreme heat when faulty, it will cause the same symptoms you are describing. This is a known issue among many manufacturers. This can be a difficult problem to detect and would need a trained eye. Have a professional, such as one from YourMechanic, inspect your starting problem and make the right repairs.

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
  1. Home
  2. Questions
  3. Trouble starting when the engine warms up, humming noise

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: Warning lights come on while backing down a hill, Infiniti G25

There is a short somewhere causing the lights to work intermittently. However, to provide more insight as to where the short might be, I would need to know exactly which lights are illuminating intermittently. I'm guessing that it is not...

Q: Engine swap? Have both VIN numbers don't want to buy if not compatible 2000 saturn LS2

Hi there - since the engine type is "R" for both VINs (position 8 in the VIN), yes, these engines should be compatible. I would recommend using the engine management (computer) and engine wiring harness from the donor vehicle, just...

Q: Running lights won't turn off - 1990 Mazda B2200

It is possible that the electrical relay for the running lights, or the light switch itself, is stuck closed, or has burned contacts. A professional mechanic with good electrical diagnostic training, like YourMechanic, can diagnose this possible electrical issue and...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...