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?
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. 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: Starting issues when it's cold outside

This is common for most cars in extreme winter months when the temperature drops. As you may know, car batteries create electrical current based upon chemical reactions inside the battery cell. When these chemicals are subjected to extreme cold, these...

Q: SUV stalling, sputtering, and losing power

I am not really sure what you mean by the "fuel backup". If your vehicle has an electronic throttle body, then this can certainly contribute to this problem. Other things like fuel pressure, bad catalytic converters, cam and crank sensors,...

Q: Q: Limp Mode

There are a number of things that may cause the vehicle to go into limp mode such as faulty transmission control components or various engine control components. Typically, when this happens the check engine light will come on triggering some...

Related articles

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...
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...
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...