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Engine shuts off bogs down while on highway and stalls?

Tiny
JASON BROWN2
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 7.4L
  • V8
  • 4WD
  • MANUAL
  • 173,390 MILES
I need a diagram of the intake egr, pvc, carbon can.
Tuesday, May 31st, 2016 AT 5:49 AM

42 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure as well as vacuum leaks auto parts scans for free and rent gauge. if hoses are soft for vacuum replace them.

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

and

https://www.2carpros.com/articles/engine-stalls

Check out the diagrams (Below). Please let us know what you find.
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Tuesday, May 31st, 2016 AT 9:54 AM
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
  • 1997 CHEVROLET SILVERADO
  • 213,150 MILES
When I put a load on and take it to 2,500 to 3,000 rpm's and let shift the engine bogs out and barely has enough power to move at 25 mph. Engine will completely shut off at this point if I open the throttle too far. This whole problem resolves itself if I park the truck and turn off for about ten to fifteen minutes.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

This could be a couple of things.

Low fuel pressure from a weak fuel pump. The pressure needs to be checked.

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

It could also be a clogged catalytic converter. The back pressure needs to be checked to confirm.

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

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
Okay, thanks. I will look into it.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Keep us updated.

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
This problem started after I replaced my rotor and cap. I forgot to include that.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, start with verifying you installed it correctly.

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
It should be. I put it back the way it came off. I did break the front screw thread so I got a c clamp on it.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Do the other checks.

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
She has low fuel pressure and I don't know why cause I replaced everything in the fuel system injectors, pump, sending unit, fuel filter, the injectors came with a pressure regulator. The injectors are the mpfi upgrade over the sfi ones
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the fuel pressure?

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DKLEIN
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET SILVERADO
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 99,999 MILES
When accelerating normal everything is fine, but if I tromp down regardless of speed it slows down and almost dies out the tach doesnt jump like the trans. Is slipping but almost as if its dumping out
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
I dont recall a 4cyl in a silverado. Whatever it may be, you should check your fuel psi. If it's dropping off a lot under hard accelleration, you might have a bad fuel pump.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
22 to 23 psi.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What motor is in the truck?

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
5.7 350.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, Te specs are below.

Your pump is not working at all.

Roy

Fuel Pressure

Central SFI. 60-66 psi
SFI. 56-62 psi
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
Okay, so pump is garbage then.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, that is correct.

Roy
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)
Tiny
DAVID7158
  • MEMBER
  • 10 POSTS
Okay, thanks.
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Thursday, September 3rd, 2020 AT 12:30 PM (Merged)

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