Skip the auto shop - Our mechanics make house calls

Q: Occasional problems with the engine startup

asked by on

My car has been having starting problems lately. It used to happen occasionally when I drive it for longer than 45 minutes. Now, it occurs randomly and more often. It can be turned on again if I wait for about half an hour and try again. At the dealership, they couldn't diagnose what the issue is. Do you have any idea what the problem is and how to fix it? Thank you in advance.

A: There are a couple of things that come to m...

There are a couple of things that come to mind. A faulty crankshaft position sensor has been known to cause this problem. Scoping the crankshaft sensor on a warm startup would be one way to determine if this is the case. Another could be a faulty ignition switch. Some powertrain control module functions turn on when the key is turned on, so if the powertrain control module does not power on, then no faults would be recorded.

As the switch warms up while the engine is on, the contacts heat up as well and this could be why the problem only occurs when the vehicle has been operated for a while. You may want to enlist the help of a mechanic, such as one from YourMechanic, who can read sensor statuses during operation to determine the cause of the starting issue and how it can be corrected.

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: What's wrong its not a head gasket

Hello. Usually oil that quickly drains into the cooling system is caused by a blown head gasket, or damaged cylinder heads. If you have verified that those things are not the source of your issue, then I would move on...

Q: Security light constantly on or flashing, battery light flashes, radio locked, power locks and dome lights don't work. Please help

Hi there, thanks for writing in. I'd be happy to provide my insight. I would not replace the BCM without a thorough diagnosis first. GM vehicles such as yours suffer from two small wires that break in the steering column....

Q: AC blowing through defrost vents

So maybe we should start with what problems you don't have. Just Kidding. Let's start with the Defroster. The problem is probably the vacuum box under the hood may be damage or a vacuum line connecting to it could be...

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...
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 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.