Intermittent no start

Tiny
UPMM019
  • MEMBER
  • 2001 CHEVROLET MONTE CARLO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 157,000 MILES
Intermittent no start is the best way to describe this issue. We will get into the car to go and turn the key and nothing. Come back later in the day then it starts. Happens multiple times a month. Has a new battery. I think the other stuff is still OEM. I.E. Ignition, starter, etc. Not sure if this will aid at all but times while driving the security light will come on and then go off, again very intermittently.
Saturday, August 28th, 2021 AT 4:49 PM

5 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

When you are unable to start the vehicle, does the security light flashes?

When it fails to start, does it make any noise when you turn the key? Any clicks?

It could be triggered by the security system or could be a faulty ignition switch. If it clicks then it could be the starter.

https://www.2carpros.com/articles/starter-not-working-repair

Please let me know.

Thank you.
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Saturday, August 28th, 2021 AT 9:09 PM
Tiny
UPMM019
  • MEMBER
  • 217 POSTS
I think I can hear the fuel pump run for a second or two. No clicks as if battery was low.

I don't think the security light was blinking either.
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Sunday, August 29th, 2021 AT 11:15 AM
Tiny
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  • MECHANIC
  • 6,383 POSTS
When you turn the key and there was not noise. Then it is likely an intermittent issue with the ignition switch, the electrical switch that the lock cylinder attaches. Many of these vehicles have issues with the dash mounted ignition switch.
Overtime the connector inside the switch wears off and you will get intermittent no start.

Here is a helpful video:

https://youtu.be/pM8-ugbMDTs

Let me know of any questions.
Thank you.
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Sunday, August 29th, 2021 AT 11:45 AM
Tiny
UPMM019
  • MEMBER
  • 217 POSTS
So you don't think it has anything to do with pass lock?
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Sunday, August 29th, 2021 AT 3:33 PM
Tiny
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  • MECHANIC
  • 6,383 POSTS
The pass lock gets its signal from the ignition switch. So yes it could be pass lock, but then again if the switch is not sending the signal to the pass lock it won't start the car. It will typically flash the anti-theft/security light.
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Sunday, August 29th, 2021 AT 3:42 PM

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