Skip the auto shop - Our mechanics make house calls

Q: Why is my minivan difficult to start when the engine is warm, but not when it is cold?

asked by on

I recently had trouble starting my car and as a result had the fuel pump changed. After about a week, I began having trouble starting the car once I had driven it, and the engine is warmed up. It turns over, and after a few times of trying to start it, it will eventually start, but sounds like it might stall when this is happening, then no problem driving after that. It starts just fine when it is cooled down. No odd smells or issues of the vehicle stalling. 6 months ago the van had stalled at an intersection, and the CAM sensor was replaced. No problems until the fuel pump died. I haven't tried changing out O2 sensor or MAP sensor or anything yet.

My car has 140500 miles.
My car has an automatic transmission.

Hey there. There are a couple of reasons why this could be happening. I have seen a faulty coolant temperature sensor cause this problem on warm start up. There also could be a problem with the crankshaft position sensor not reading properly and causing a hard start. I have also seen fouled spark plugs cause this issue as well. The spark plugs could be fouled from the hard starting issue you had before you put the new fuel pump in. The oxygen sensor will not cause your car not to start if it has gone bad. I suggest having a certified technician from YourMechanic come and diagnose this hard start in person so that the right repair can be performed.

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
  • Home
  • Questions
  • Why is my minivan difficult to start when the engine is warm, but not when it is cold?

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: Car Periodically Won't Start, Battery is perfectly fine.

Hello, thank you for writing in. If the engine is not turning over when you try to start the car then the starter is not receiving power, or is not using the power. Several components must pass the electricity through...

Q: Car overheated and then shut down

Hello. Though there are many places that coolant can leak on this vehicle. The most common cause of a fast leak is a failing water pump or a crack in the radiator. I have also seen a lot of coolant...

Q: I am leaking all of my coolant near the rear passenger side tire. What could be the exact cause and how much to fix?

Hey there. This vehicle has a dual A/C and heat system. This means you has a complete A/C heat system mounted in the rear of the vehicle inside the passenger side. The rear system has A/C lines and heater hoses...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...