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.

A: Hey there. There are a couple of reasons wh...

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

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car stutter starts, but only after driving it for a few minutes.

Hey there. This may also be caused by what is called the fuel pressure regulator. This is a unit that helps to maintain the fuel pressure at the proper level. When this is not working properly, the fuel pump may...

Q: My car won't move when i press the gas pedal i have never had a problem before. I did notice a leak but i thought it was the oil from the transmission.

You should check for any codes that could be stored in the ECM (computer) as the check engine light is on. This will give you a starting place to check for the condition that you are having. Since the vehicle...

Q: OK my car was stalling out so I started checking the obvious battery alternator plugs wires not the problem

Start by checking power to the relay. If there is no power to the relay this would suggest you have either a bad wiring problem to the relay or potentially a bad ECU driver that supplies the power to the...

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...
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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...