Engine will not stay started

Tiny
QUINCYF93
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
The only way it will fire up is if I build the fuel pressure by turning the key 4 or 5 times. Then it will fire up then turn off within 40 seconds. When I try to hit the gas pedal it just makes the engine shut off. I changed the fuel pump and cleaned my throttle body.
Sunday, July 28th, 2019 AT 11:26 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,591 POSTS
This sounds like you have a throttle pedal position sensor or throttle actuator that is not working correctly. To be sure lets run the codes to see what we find. here is a guide:

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

Please run down this guide and report back.
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Monday, July 29th, 2019 AT 11:40 AM
Tiny
QUINCYF93
  • MEMBER
  • 3 POSTS
Unfortunately none of the codes are popping up because I got a new battery. But I already replaced the TPS unit.
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Monday, July 29th, 2019 AT 3:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,591 POSTS
The codes will still be there even with a new battery because they stay in the computer memory until cleared. But it could be a clogged catalytic converter that is causing the issues as well here is a guide to help. Please run the codes

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please run down this guide and report back.

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Tuesday, July 30th, 2019 AT 10:49 AM
Tiny
QUINCYF93
  • MEMBER
  • 3 POSTS
I ran the codes & nothing popped up. They where cleared.I got a new catalytic converter put on a month before this started happening
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Tuesday, July 30th, 2019 AT 11:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,591 POSTS
You could have a bad gas. When you had the tank out did you use a flashlight to look for water in the fuel? Also, can you please shoot a quick video with your phone so we can see what's going on? That would be great. You can upload it here with your response.
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Wednesday, July 31st, 2019 AT 9:54 AM

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