Engine hesitates to start when warm

Tiny
AGUSTIN ROIG
  • MEMBER
  • 1996 TOYOTA RAV4
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
First thing in the morning when the engine is cold, it will start up with no problems. When the vehicle has been driven for at least an hour and gets hot, it hesitates to start. It will crank up but with hesitation when the engine is hot. Could it be a problem with the coolant temperature sensor? You help will be Greatly appreciated. Thank you.
Monday, November 4th, 2019 AT 9:18 AM

5 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Have you retrieved the engine codes? Here is a quick guide that can help: https://www.2carpros.com/articles/engine-cranks-excessively-before-starting
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Monday, November 4th, 2019 AT 9:49 AM
Tiny
AGUSTIN ROIG
  • MEMBER
  • 3 POSTS
Here is a video of what is happening when trying to start it when the engine is warm. Also when you touch the radiator it is extremely hot.
Video (Click to make bigger)
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Monday, November 4th, 2019 AT 10:38 AM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Sounds like a long hard crank condition that I usually get when a fuel pump is dropping pressure, or one or more injectors are bleeding down into the cylinder/s. The fuel pressure spec is 44-50 psi at idle, and should remain above 21 psi after 5 minutes of the engine off. Also verify the engine temp with a temperature gun if you think it is too hot. And again, make sure there are no memory codes in the engine computer.
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Monday, November 4th, 2019 AT 11:57 AM
Tiny
AGUSTIN ROIG
  • MEMBER
  • 3 POSTS
Did you receive my video?
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Monday, November 4th, 2019 AT 12:48 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Yes.
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Monday, November 4th, 2019 AT 1:37 PM

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