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

2007 CHEVROLET TRAILBLAZER
175,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
JWITTEN
  • MEMBER
  • 1 POST
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.
Sep 20, 2020 at 12:06 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 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
Sep 20, 2020 at 2:20 AM
Advertisement