Will not stay started after replacing ignition cylinder

Tiny
IGENIUS92
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 4.2L
  • V6
  • 144,000 MILES
Hello, I have the vehicle listed above and I lost the key for it. So I changed out the old ignition cylinder with key. I had to drill the old one out didn't damage anything but the actual ignition cylinder to get it out and believe me it wasn't easy, lol. I got it out and put the new ignition cylinder with key in now as I start the vehicle it wont stay started like it's not getting enough gas or something can anyone help?
Saturday, June 6th, 2020 AT 11:07 AM

12 Replies

Tiny
AL514
  • MECHANIC
  • 5,499 POSTS
Hello, I'm assuming this problem wasn't happening before you replaced the ignition switch?If you're concerned about a fuel issue, here is a quick guide to help with that, and actually if you go to AutoZone or advanced auto they will rent you the tool for free, you get your money back when you return the fuel pressure tester, as for many other tools, they will scan the computer for diagnostic trouble codes as well for free.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, June 6th, 2020 AT 4:08 PM
Tiny
IGENIUS92
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Well, it wasn't doing that with the fuel before I changed the ignition lock cylinder so could it be a pass like anti theft mode that would prevent the fuel pump from engaging?
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Saturday, June 6th, 2020 AT 4:14 PM
Tiny
AL514
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It's a possibility, but I would do a fuel pressure test first to see if that's what you're actually losing. It could be a bad switch too, I know it's new, but we've been having a rash of bad aftermarket parts, the start circuit and run circuit and 2 different circuits coming out of the ignition switch, so finding out what's dropping out first, like ignition power (run position) from that new ignition switch is first.
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Saturday, June 6th, 2020 AT 4:24 PM
Tiny
IGENIUS92
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  • 205 POSTS
Okay, so I by past the fuel pump relay and I hear it triggering, the fuel sounds liken it's getting to the engine but it wont stay started it will crank over and then shut off.
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Saturday, June 6th, 2020 AT 4:40 PM
Tiny
AL514
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You need to run a fuel pressure test and see what's going on, you need to verify that you are not losing fuel pressure. Go to AutoZone or advance Auto and they let you rent one you just have to pay for it and then give you your money back when you return it. Is the security light flashing on the dashboard when you're trying to crank it over?
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Sunday, June 7th, 2020 AT 8:53 AM
Tiny
IGENIUS92
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  • 205 POSTS
Security light on? I believe so yes.
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Sunday, June 7th, 2020 AT 12:15 PM
Tiny
AL514
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Does it stay on while cranking? It should go out, if not the running for 2 seconds and shutting down is normal. You may need to have the new key programmed/re-coded to the security system. Most shops can do this with a scan tool.
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Sunday, June 7th, 2020 AT 4:51 PM
Tiny
IGENIUS92
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This very well may be. What's the average cost for something like that?
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Sunday, June 7th, 2020 AT 4:52 PM
Tiny
AL514
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It actually shouldn't be too much, just make sure they have a scan tool that can get into the security system to relearn the new key.
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Sunday, June 7th, 2020 AT 4:58 PM
Tiny
IGENIUS92
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Okay, thanks.
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Sunday, June 7th, 2020 AT 4:59 PM
Tiny
AL514
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Let us know how it goes, we like to hear back as to what resolved the problem.
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Monday, June 8th, 2020 AT 10:42 AM
Tiny
IGENIUS92
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Okay.
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Monday, June 8th, 2020 AT 12:45 PM

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