When attempting to accelerate the engine bogs down?

Tiny
WAYNE YOUNKER
  • MEMBER
  • 1986 NISSAN TRUCK
  • 4 CYL
  • 4WD
  • 117,350 MILES
Truck starts and idles just fine. However, when I try to give it gas to accelerate it bogs down. It started with this a happening on uphill. Now it is happening all the time.
Tuesday, March 12th, 2019 AT 9:42 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Welcome to 2CarPros.

The first thing I recommend checking is fuel pressure. It sounds like it is starving for fuel. Here are the directions listed for your vehicle. The directions include pressure specifications.

1. Release fuel system pressure.
2. Disconnect fuel inlet hose from injection unit and tee in a suitable pressure gauge.
3. Start engine and check for fuel leaks, then check pressure gauge reading. At idle, fuel pressure should be approximately 14 psi on 1986 Pickup and 1987-88 2WD Sentra or 36 psi on 1987-88 Pathfinder, Pickup, Van and 4WD Sentra.
4. Release fuel system pressure, then remove pressure gauge and reconnect fuel line.

Here is a link that shows how it is done in general but with more detail:

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

Let me know the results.

Joe
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Wednesday, March 13th, 2019 AT 9:29 PM
Tiny
WAYNE YOUNKER
  • MEMBER
  • 2 POSTS
My truck is not fuel injected. It has a carburator.(Sp) I'm going to replace the fuel filter today to see if that helps.I also will check fuel line pressure. Thank you.
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Thursday, March 14th, 2019 AT 7:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
No problem. If you have a carburetor, with the engine off, open the choke plate so you can see into the carburetor. Next, have a helper pump the gas from the inside of the car. You should see a mist of gas shoot into the venture. If there isn't any, then the accelerator pump is bad. That will cause a bog until the air fuel mixture regulates itself.

Also, I strongly recommend checking for vacuum leaks. Make sure the base plate gasket where the carburetor, and intake meet, isn't leaking. I've even seen the carburetor, loose in some cases. I have also seen play in the shaft that holds the throttle plate allow air to cause problems.

Let me know.

Joe
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Thursday, March 14th, 2019 AT 5:35 PM
Tiny
DBAKE
  • MEMBER
  • 1 POST
Did not fix problem?
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Saturday, March 4th, 2023 AT 12:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Hi:

What type of problem are you having? Also, let me know if it is the same year, make, and model vehicle.

Let me know.

Joe
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Sunday, March 5th, 2023 AT 9:03 PM

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