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After an engine swap/replacement vehicle ran, but now will not start?

Tiny
JWITTEN
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
Put motor from 2005 trailblazer in the 2007. Same size motor. The motor ran for awhile but now will not start. Tried everything. The fuel pump is kicking on. Do not know what it could be. Could it be security.
Sunday, September 20th, 2020 AT 12:06 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Does the theft or security light go out after about 10 seconds with the key on?

https://www.2carpros.com/articles/how-to-reset-a-security-system

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

Can you check the fuel pressure to see if the pump is producing the correct pressure?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Can you check to see if it has any spark? When you crank the engine, does the tachometer on the dash move up a little showing RPM? That will tell me if the crank sensor is sending a signal to the ECM.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/how-to-test-an-ignition-system

I would also check the compression to be sure the engine is not damaged internally.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Sunday, September 20th, 2020 AT 2:20 AM

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