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My engine keeps stalling while driving?

Tiny
BIGINAMERICA
  • MEMBER
  • 2 POSTS
Thanks for your comment, the 1 gal. Was in fact enough but it took the night to trickle into the right places. In the morning it started without a problem and stayed on. Thanks for reaffirming that it was just related to the steep slope and the low gas.
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Thursday, January 7th, 2021 AT 1:13 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Glad to help. Let us know if you have questions in the future.

Joe
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Thursday, January 7th, 2021 AT 1:13 PM (Merged)
Tiny
MIKEY1157
  • MEMBER
  • 3 POSTS
  • 1993 NISSAN SENTRA
I have a 1993 Nissan Sentra 1.6l E with 187000 miles on it and it has developed a problem when it warms up. The car will stall out when I accelerate. I will then have to sit on the side of the road for a couple on minutes then it will start. I can limp along up to speeds of up to 35 40 MPH, but if I push it, it will stall out again. After serveral re-starts, it wont start again utill it cools down. Once cool, it runs fine.
I have replaced all of the ignition components, Checked fuel pressure, and filter. I do have a loud muffler that will need replacing soon. Should I check the TPS or is it failing due to the loss of back bressure from the muffler?

Any ideas would be appriciated
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Thursday, January 7th, 2021 AT 1:13 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Sounds like a fuel pump going bad on it. I think you acess it from under the rear seat. Once you pull it out you may find a bad electrical connection or ground that may solve it before you replace the pump. Get a fuel pressure gauge and check the pressure when the car is unable to start. IF it isn't in spec, then you know the rest!
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Thursday, January 7th, 2021 AT 1:13 PM (Merged)
Tiny
SEZRIB
  • MEMBER
  • 1 POST
  • 1992 NISSAN SENTRA
  • 4 CYL
  • 2WD
  • MANUAL
  • 160,000 MILES
I started having problems with the power; I need to constantly downshift, and even then it's sluggish. Engine idles rough at stoplights, and sometimes stalls on turns. Starts right back up after stalling, though.
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Thursday, January 7th, 2021 AT 1:14 PM (Merged)
Tiny
KEVIN12881
  • MEMBER
  • 336 POSTS
Have you kept up with tune ups? Try some of the following, number 7 is not it Engine lacks power. See one of the following: 1.) Incorrect ignition timing. 2) Fuel filter clogged and/of impurities in fuel 3) Faulty or incorrect gapped spark plugs. 4) Air filter dirty. 5) Spark timing control system not working properly. 6) Faulty ignition coil(s) 7) Brakes binding. 8) Auto Trans fluid not correct 9) faulty distributor cap or wires 10) EGR system not functioning properly. 11) Use of sub standard fuel. 12) Low or uneven cylinder compression pressures 13) Air vacuum leak at intake manifold or plenum
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Thursday, January 7th, 2021 AT 1:14 PM (Merged)
Tiny
WILLIAMD00
  • MEMBER
  • 7 POSTS
  • 1992 NISSAN SENTRA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 202,000 MILES
Only when car is idling and I attempt to press gas pedal car shuts off
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Thursday, January 7th, 2021 AT 1:14 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

If it stalls when you press the gas, I have a feeling the fuel pump isn't producing enough pressure. Is the check engine light staying on when the engine is running?

If the light isn't staying on, I recommend starting with fuel pressure. Here is a link that explains in general how it is done:

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

Here are the directions specific to your vehicle. The specs are in the directions and the pictures correlate with the directions. Note: I realize most people don't own a fuel pressure gauge. However, most parts stores will lend or rent one to you.

____________________________________________

FUEL PRESSURE TEST
Fuel Pump Fuse

Pic 1

NOTE: To obtain an accurate fuel pressure reading the engine must by running. Basic fuel pump operation can be verified in a no start condition by observing gauge reading while cranking engine. Fuel pressure should be approximately 43 psi (294 kPa).

1. Remove fuel pump fuse from underdash fuse box.
2. Start engine.
3. When engine stalls, crank or attempt to restart engine 2 or 3 times to release pressure.
4. Turn ignition switch off and reinstall fuel pump fuse.

NOTE: Steps 1 through 4 are provided to release fuel system pressure to eliminate fuel spray.

Fuel Pressure Gauge Connection

Pic 2

5. Disconnect fuel line from fuel filter and connect a suitable pressure gauge as shown.
6. Disconnect and plug vacuum line from fuel pressure regulator. Connect vacuum pump to pressure regulator.
7. Start engine and idle.
8. Fuel pressure should be approx. 43 psi (294 kPa). If pressure is correct proceed to step 10, if not OK continue.
9. Using pliers, gently pinch fuel return line at fuel rail. If fuel pressure rises to approx. 43 psi (294 kPa) pressure regulator is defective. If pressure still is low or did not change, check fuel filter before replacing pump.
10. Slowly apply vacuum to the pressure regulator while watching fuel pressure.
11. Fuel pressure should decrease as vacuum increases, down to approx. 33 psi (226 kPa) at 20 in.Hg.
12. If fuel pressure does not respond to the application of vacuum, check fuel return line for restriction prior to replacing fuel pressure regulator.

___________________________________________________________

If you find the fuel pump is bad, here are the directions for replacement.

PROCEDURES

CAUTION: Do not perform these procedures while smoking, near any open flame, electrical contacts or other potential source of ignition.

Fuel Pump Fuse Location

Pic 3

1. Release fuel pressure:
A. Remove fuse for fuel pump.
B. Start engine.
C. After engine stops, crank engine two or three times to make sure that fuel pressure is released.
D. Turn ignition switch off and install fuse for fuel pump.

2. Remove rear seat bottom and back cushion.

Fuel Pump Access Cover

Pic 4

3. Remove Inspection hole cover.

CAUTION: Use rubber gloves to prevent fuel from contacting the skin when removing the fuel hoses and pump.

4. Disconnect electrical connector and fuel hoses.
5. Remove the six screws.

Gauge/Pump Assembly Removal

pic 5

TECH TIP: The sheet metal for the top of the fuel tank is REALLY SHARP! One way to protect yourself is to take some door edge moulding and apply it to the lip of the tank opening. Vacuum hose sliced lengthwise will work too.

6. Remove fuel gauge sending unit and disconnect the fuel hoses and connector.

Fuel Pump Removal

pic 6

7. Remove fuel pump from fuel pump bracket by pinching the tab and lifting the pump out of fuel tank bracket.
8. Installation procedure is the reverse order of removal noting the following:

Always replace fuel tank O-ring with a new one.
Verify the two hoses to the plastic cover plate are installed correctly. The engine won't run if the hoses are reversed.
Tighten screws to specified torque 2.4-3.1 ft.lbs.
After installation, run engine and check for leaks at connections. Also verify the fuel gauge works.

____________________________________
Let me know what you find or if you have other questions.

Take care,
Joe

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