My car has a problem. When I start the car when it cold it start with no problem. But when the car is hot it doesn't start I have to wait until it cools down plz help

Bruce Bracey

• 1000 Answers
• Posted on Feb 09, 2009

SOURCE: 95 saturn won't start when hot

Blair, I would take a look at he TPS (throttle position sensor) located on the throttle body. In other words, it sounds as thought sensor when heated is changing its value to "open" or "shorted".
If the car starts OK when cold, use a hair dryer to heat the TPS when the engine is cold to see if you can duplicate the problem.
Also is the a service engine light on? Codes?
If you have a "digital volt/ohm meter" available you can read the variable resistance of the sensor when the problem occurrs to determine if the sensor is defective.

SOURCE: car starts cold start stalls after short time

Sounds like the Idle Air Control Valve which is a dealer part.

SOURCE: car will not start when hot, D4 light is flashing, car will start

I had a '91 Accord. When the car would get hot, i.e., sitting closed up in the hot sun, the car would not start. Not even turn over. I don't know what the D4 light is. I called John Eagle in Houston where I bought it brand new. The service supervisor said it was probably the main fuel relay. I think that's what he called it (it's been a few years). This relay shuts the gasoline off to the engine when the car gets too hot. It is a safey thing so that the car won't catch on fire, like in the case of an accident. He said to open all the doors and raise the hood so the car can cool off. Sure enough, after about 15 minutes or so, the car would start right up. If I remember correctly, I think the relay is located under the carpet on/near the firewall on the driver's side. Seems like the Honda OEM part was about $80.00. Don't know if this helps or not, but I thought I would throw in my two cent's. Good luck.

SOURCE: WHEN ITS HOT OUTSIDE MY 1996 VW PASSAT WILL NOT START

The car is having overheating problem,its not battery(change top gasket)

SOURCE: ford taurus 2001 car start but once the car is cut off it won't start up again until it cools off the car is not running hot.

After you kill it, when you try to start it back up, does the starter turn the motor? Or is it froze up (will not turn over)?