Hard starts when engine is hot?

2010 LINCOLN MKS
145,000 MILES • 3.7L • 6 CYL • 4WD • AUTOMATIC
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LADUKEJUSTIN
  • MEMBER
  • 1 POST
I purchased the car listed above a couple weeks ago and noticed that when the car is hot, i'm having a lot of hard starts. i have had the battery tested, changed spark plugs, changed oil, tested fuel injectors and the problem is still there.
Apr 12, 2021 at 4:15 PM
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4DRTOM
  • ✓ASE Certified Mechanic
  • 467 POSTS
  • ASE Certified Mechanic
If its only happening once its warmed up one thing could be the temperature sensor or another sensor the computer needs info from that is only failing after its hot. This sounds like the crankshaft angle sensor or the fuel pump has gone out, when you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds? These guides should help us fix it.

https://youtu.be/dCjmRL3p4Cs

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

ad

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Also, lets run the codes to see what come up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Please run down these guides and report back.

Tom
Apr 14, 2021 at 4:58 AM
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