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Engine will not start and run?

Tiny
DAVIDBLANK
  • MEMBER
  • 2007 GMC ENVOY
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Started having problems with truck not starting. Thought was battery, replaced battery an alternator. Would work fine for a day or so then it would start over just turning over like getting no fuel. Pull fuel pump relay an put back in starts right up. Replaced relay still having same problem. Have any suggestions what we should try next?
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Sunday, June 2nd, 2019 AT 8:28 AM

49 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Can you check the fuel pressure when it will not start?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Sunday, June 2nd, 2019 AT 9:07 AM
Tiny
DAVIDBLANK
  • MEMBER
  • 8 POSTS
Yes, the engine cranks over but no start. If you pull the fuel pump relay then put it back in it starts right up. I replaced relay and is still occurring.
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Sunday, June 2nd, 2019 AT 11:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, this sounds like a classic fuel pump problem, here is a guide to help walk you through the repair with diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Check out the diagrams (Below). Please let us know what happens.

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Sunday, June 2nd, 2019 AT 11:37 AM
Tiny
DAVIDBLANK
  • MEMBER
  • 8 POSTS
Sorry it took a while to get back to you but you were right the fuel pump. Fixed it all good!
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Wednesday, October 28th, 2020 AT 11:05 AM
Tiny
RUSS1953
  • MEMBER
  • 23 POSTS
  • 2004 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 28,000 MILES
The engine will turn over but does not start. There is no spark at the coils over plugs. I check for power at the coil it had ten to twelve volts and I check for ground it was good. I did not check for a signal. How do I check for a signal at the coils? How do I check for voltage and signal at the crank sensor?
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try a security system reset first. See picture.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
RUSS1953
  • MEMBER
  • 23 POSTS
I have not tried to reset the security system yet, but I will. What cause the system to get off set? When I turn the key on the security light is on solid but it goes out in about three to five seconds about the same time the fuel pump stop running.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
They just do that they are electronic. It can be something else but try that first. Then scan for codes.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hello RUSS1953,

I am sending you a link that if you decide to conduct the scan yourself will be of help to you. The link features an article with written step by step instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning.

This is applicable even if your check engine light is not on.

Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

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

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
RUSS1953
  • MEMBER
  • 23 POSTS
The codes are P2101, P1516,2119 before these codes was read the battery cable had been disconnected because the battery went dead but these codes still show up every time I disconnect the battery cable I have a Innova 3040c scan tool that I uses and it also retrieved vehicle data does the engine have to be running to view live data? Will these codes cause no spark at the coils? I hope I can get to the root of the problem soon I am experiencing from this.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This was explained to you by cardio doc just yesterday and here you are asking the same question again. You have been suggested what to do repeatedly and should not be asking the same questions again
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
RUSS1953
  • MEMBER
  • 23 POSTS
I did a security system reset that didn't help still no spark at the coils not getting no signal from the PCM to the coils
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
CORYTAYLOR2908
  • MEMBER
  • 2 POSTS
  • 2004 GMC ENVOY
  • 101,333 MILES
I changed the spark plugs out in my envoy one at a time because it has individual coil packs on it and I dint want to get them crossed up. After changing the plugs I tried to start my truck and it would not start. I then checked each coil pack to make sure the connection was good and tried to start again, still wouldn't start. I then put the old plugs back I to make sure the plugs that I had purchased was not a bad set of plugs and it still will not start. What will cause that to happen.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Look around all the area to be sure that you did not leave any connectors undone. Start there

Roy
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
CORYTAYLOR2908
  • MEMBER
  • 2 POSTS
Everything is connected.
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to verify spark and fuel pressure.

Shoot some starting fluid in the air filter to see if it starts

Roy
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Wednesday, October 28th, 2020 AT 11:08 AM (Merged)
Tiny
JOE1953
  • MEMBER
  • 620 POSTS
  • 2004 GMC ENVOY
  • 4.2L
  • 4WD
  • AUTOMATIC
  • 204,000 MILES
I replace the fuel pump and fuel filter on my SUV. The first time I check the fuel pressure after I replace the new fuel pump it show about 56 psi the test port is connect to the fuel line at the fuel filter there is where I check the pressure is there another test port under the hood where I can test the pressure there? The engine will crank but wont start when I turn the key to run the pump will run for about two second and sometimes the pump keep on running and wont stop until I turn the key off. What causes the pump to keep on running? What to check and how do I fix all the problems? I want to get it going need a way to get around in.
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Wednesday, October 28th, 2020 AT 11:12 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back. it should be 50-57 psi at fuel rail and not drop more than 5 psi after ten minutes it may be a partially blocked line. if you spray choke cleaner into throttle body and it starts fine if not try resetting security system.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check out the diagrams (Below). Please let us know what happens.
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Wednesday, October 28th, 2020 AT 11:12 AM (Merged)
Tiny
JOE1953
  • MEMBER
  • 620 POSTS
Can you send me pictures of the test port at the fuel rail? I look for it but could not find it. Does the throttle body have to be open to spray choke cleaner into it? Where do I spray it in at? I tried to open the throttle body when press on the gas pedal it did not open. How do I check for a blocked line?
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Wednesday, October 28th, 2020 AT 11:12 AM (Merged)
Tiny
JOE1953
  • MEMBER
  • 620 POSTS
The engine was running good went to the store when got back into the vehicle to start it it would not start.
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Wednesday, October 28th, 2020 AT 11:12 AM (Merged)

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