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Not starting after sitting all winter

Tiny
PHIVAL
  • MEMBER
  • 2005 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 358,000 MILES
Truck has been sitting all winter. Fuel pressure 55 PSI KOEO. Has injector signal from PCM. When cranking rpm shows 330-390 RPMs. Has spark. When trying to start WOT starts for a second then shuts off. Truck was running everyday prior to this. Has new battery and plugs and wires. No codes.
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Sunday, March 28th, 2021 AT 7:05 AM

21 Replies

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

Does the theft or security light go out after about 10 seconds with the key on?

This sounds like the security system is shutting it down. I attached a guide below for you to try to see if it gets it out of the security lock.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Roy
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Sunday, March 28th, 2021 AT 7:36 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
The key is not chipped.
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Sunday, March 28th, 2021 AT 7:57 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, if you spray some starter fluid in the air filter, does it start and stall?

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

I would also check the compression to be sure the timing chain is good. You need 140-160 pounds.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Sunday, March 28th, 2021 AT 8:02 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
140 170
170 195
140 165
190 170
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Sunday, March 28th, 2021 AT 9:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that is good.

What about spraying the starter fluid in the air filter? Did it start and stall?

Roy
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Sunday, March 28th, 2021 AT 9:49 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
When I squirted fuel into throttle plate I had to step on accelerator as if it was flooded. It did not start with extra fuel being squirted into the throttle plate.
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Sunday, March 28th, 2021 AT 10:22 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you verify the spark by removing one of the wires and checking?

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Roy
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Sunday, March 28th, 2021 AT 10:36 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
Yes had a wire connected to plug from coil and grounded plug.
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Sunday, March 28th, 2021 AT 10:58 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
After you shut the engine off, does the fuel pressure bleed down? Looking to see if you may have an injector leaking.

Roy
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Sunday, March 28th, 2021 AT 11:03 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
About the coil no misfire codes. It may leak down 2-3 PSI.
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Sunday, March 28th, 2021 AT 11:25 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, I would remove the valve covers and make sure all the valves are moving.

Roy

Valve Rocker Arm Cover Replacement - Left

Removal Procedure

imageOpen In New TabZoom/Print

1. Remove the engine sight shield, if required.
2. Remove the Connector Position Assurance (CPA) lock.
3. Disconnect the main electrical connector (2) to the ignition coil wire harness.
4. Remove the harness clips (1).
5. Reposition the engine harness, if necessary.
6. Remove the spark plug wires from the ignition coils.
Twist each plug wire 1/2 turn.
Pull only on the boot in order to remove the wire from the ignition coil.

ImageOpen In New TabZoom/Print

7. Remove the ignition coil bracket studs.
8. Remove the ignition coil bracket.

ImageOpen In New TabZoom/Print

9. Remove the positive crankcase ventilation (PCV) hose.

ImageOpen In New TabZoom/Print

10. Loosen the valve rocker arm cover bolts.
11. Remove the valve rocker arm cover.

ImageOpen In New TabZoom/Print

12. Remove and discard the old gasket (1).
13. If required, clean and inspect the rocker arm cover.
Images (Click to make bigger)
Thumb
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Monday, March 29th, 2021 AT 4:41 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
We had a big storm so after I finished pushing snow with the loader I started back onto the truck. Tried to start it with WOT twice and it started. Try ing to figure it out. Runs the same as before. No codes. Thanks for your time.
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Sunday, April 4th, 2021 AT 2:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you check the actual fuel pressure?

Roy
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Sunday, April 4th, 2021 AT 4:21 PM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
Yes 59 PSI. I also bought another fuel pump gauge to check. They both had the same PSI.
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Sunday, April 4th, 2021 AT 6:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Then the next step is to check fuel quality. From sitting a long time, the fuel itself may be the issue.

Roy
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Monday, April 5th, 2021 AT 3:37 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
Checked that. Quality is good, no water, clean. Put fuel in a open container and it burns.
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Monday, April 5th, 2021 AT 4:26 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, circling back to spark, you may have a weak spark. Did you verify battery voltage to all the coils?

Roy
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Monday, April 5th, 2021 AT 4:38 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
No, I did not.
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Monday, April 5th, 2021 AT 5:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
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I would verify this and get back to me with the results.

Roy
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Monday, April 5th, 2021 AT 5:33 AM
Tiny
PHIVAL
  • MEMBER
  • 11 POSTS
Okay.
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Monday, April 5th, 2021 AT 5:50 AM

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