Does not start after replacing mass airflow sensor and MAP sensor

2010 CHEVROLET TAHOE
166,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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JDAVIS673
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After I got the reduced power to engine warning the engine shut off then was rear ended. Once towed I was able to put a scan tool on and it gave codes for the mass airflow sensor and MAP sensor being bad. I replaced those and the throttle position sensor. Now the engine will not start. Unsure of what to do next.
Dec 6, 2021 at 12:08 AM
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JACOBANDNICKOLAS
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Hi,

If you disconnect the MAF, will it start? By disconnecting it, it should put it into a preset mode which allows the engine to continue running. Also, what codes did you find when it was originally checked?

I want to try a test. Will it start for a couple of seconds if you use starting fluid?

Let me know.

Joe
Dec 6, 2021 at 6:41 PM
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JDAVIS673
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I removed the MAP, and it didn’t start. I’m thinking it might be a switch on the fuel pump or something like that that gets tripped when in a collision. Not sure though.
Dec 6, 2021 at 8:39 PM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
I looked through the wiring schematic for the starting system and don't see a traditional automatic shutdown relay.

How hard were you hit from the rear? Also, have you checked to see if the engine is getting spark and fuel? Will it start with starting fluid and then shot down?


Let me know.

Joe
Dec 7, 2021 at 7:48 PM