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Why does my 1995 F150 need to cool down before able to restart

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This would be a problem known as a "heat-sink" problem. There are several causes to a problem like this. One problem is the engine is too lean to start when it is hot. Modern engines run extremely lean and need to reset to a richer mode to restart.

Sometimes the O2 sensors do not cool down fast enough to reset the mode, or the brain is not responding to the reset signal from the O2's.

Another possibility is an overheated electric Relay. If you look at many relays you usually will see more than 2 or 3 terminals on them. These extra terminals work in a sequence. They need to release from their "ON" mode to reset to a "start" sequence. If any terminal is not releasing, the circuit will not complete.

One thing you should try is to get a fuel pressure reading from the test port to see what you have available. Now although the injectors can be checked separately,(with a Noide tester or Voltmeter) for the most part you want to find out if you are lacking fuel or spark on a "hot" restart. Having fuel pressure does not mean the injectors are opening, but no pressure would tell you a fuel pump or Relay is not working.

Some of the testing tools are available at big chains like Autozone under their free loaner programs.

Another fairly inexpensive part would be a water temperature sender and/or a new thermostat. These would affect the RESET process.

Posted on May 13, 2014

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Starter might be hot

Posted on May 13, 2014

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