Question about 1987 Nissan Pathfinder

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Engine starts then stalls, is it the fuel pressure reg or injector(s)?

Engine starts but then stalls, if pedal is pumped, it will run but rough. When then fuel return line is removed from the fuel injection pressure regulator, it starts and runs and will rev although I've got another tube on it and fuel is draining in a container. Do you think the problem may be with the regulator (too much pressure and flooding it while if the lines off drops the pressure?) or one of the injectors? Thanks

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  • Nissan Master
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Generally speaking, too much pressure should not cause any problems. The injectors should be able to open and close. Its possible there is a blockage in the return line to the tank and that is causing the pressure or flow in the main line to drop but I doubt it.
Have you checked pressure with a gauge yet ?

Posted on Jul 14, 2013

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the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.

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Engine idle very lumpy and wanting to stall on gear down shift. Sometimes poor on starting until fuel gets through then car runs well but very smelly.


SYMPTOM 1: ROUGH IDLE IN THE COLD

The engine will not idle smoothly, or it stalls during idle when the engine is cold. When the engine is cold and you take your foot off the gas pedal, the engine runs very rough and may even stall. When you run the engine at higher speeds, it seems to run fine, or at least it runs more smoothly.
Possible causes:
  1. If you have a carburetor, you may have a bad accelerator pump or power circuit.
    The Fix: Replace accelerator pump or replace the carburetor.
  2. There may be a vacuum leak.
    The Fix: Check and replace the vacuum lines as required.
  3. There may be some type of ignition problem.
    The Fix: Check and replace the distributor cap, rotor, ignition wires, and spark plugs.
  4. The ignition timing may be set wrong.
    The Fix: Adjust the ignition timing.
  5. There may be a fault in the computerized engine control system.
    The Fix: Check engine control systems with a scan tool. Test the circuits and repair or replace components as required.
  1. The EGR valve may be bad.
    The Fix: Replace the EGR valve.
  2. The engine may have mechanical problems.
    The Fix: Check the compression to determine the engine's condition.
  3. Idle speed is set incorrectly.
    The Fix: Set idle speed to the car's original settings.
  4. The fuel injectors may be dirty.
    The Fix: Clean or replace the fuel injectors.

SYMPTOM 2: ROUGH IDLE WITH WARM ENGINE

The engine will not idle smoothly, or it stalls during idle when the engine is warm. When the engine is warm or hot and you take your foot off the gas pedal, the engine runs very rough and may even stall. When you run the engine at higher speeds, it seems to run fine.
Possible causes:
  1. If you have a carburetor, you may have a bad accelerator pump or power circuit.
    The Fix: Replace accelerator pump or replace the carburetor.
  2. There may be a vacuum leak.
    The Fix: Check and replace vacuum lines as required.
  3. The fuel pressure regulator may be operating at too low a pressure.
    The Fix: Check the fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (This is not really a do-it-yourself kind of job.)
  4. Idle speed set incorrectly.
    The Fix: Set idle speed to specs.
  5. There may be some type of ignition problem.
    The Fix: Check and replace distributor cap, rotor, ignition wires and spark plugs.
  6. There may be a fault in the computerized engine control system.
    The Fix: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (This is not really a do-it-yourself kind of job.)
  7. The EGR valve may be bad.
    The Fix: Replace EGR valve.
  1. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  2. The fuel injectors may be dirty.
    The Fix: Clean or replace fuel injectors.

SYMPTOM 3: FAST IDLING

The engine idles too fast. After the engine has run long enough to become warm, the idle speed does not come down to normal. You really notice it when you come to a stop and must have to push ******* the brake pedal to keep the car from moving.
Possible causes:
  1. If you have a carburetor, you may have a bad accelerator pump or power circuit.
    The Fix: Replace the accelerator pump or replace the carburetor.
  2. The engine may be overheating.
    The Fix: Check and repair the cooling system.
  3. The fuel pressure regulator may be operating at too low a pressure.
    The Fix: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (This is not really a do-it-yourself kind of job.)
  1. The ignition timing may be set wrong.
    The Fix: Adjust the ignition timing.
  2. There may be some type of ignition problem.
    The Fix: Check and replace the distributor cap, rotor, ignition wires and spark plugs.
  3. There may be a fault in the computerized engine control system.
    The Fix: Check the engine control systems with a scan tool. Test the circuits and repair or replace the components as required.
  4. There may be a vacuum leak.
    The Fix: Check and replace vacuum lines as required.
  5. You have a bad idle speed control unit.
    The Fix: Replace the idle speed control unit.
  6. The alternator may not be working properly.
    The Fix: Replace the alternator.

SYMPTOM 4: STALLING UPON STOPPING

Car stalls when stopped quickly. You are driving along and everything is just fine ... until you let off the gas pedal and apply the brakes. The engine starts shaking and may even stall. Not a good thing to happen because you lose power steering when the engine dies and could risk an accident.
Possible causes:
  1. There may be a serious vacuum leak.
    The Fix: Check and replace the vacuum lines as required.
  2. There may be a fault in the computerized engine control system.
    The Fix: Check the engine control systems with a scan tool. Test the circuits and repair or replace the components as required. (This is not really a do-it-yourself kind of job.)
  3. Broken linkage.
    The Fix: Repair or replace the linkage as required.
Idling issues can be very frustrating, but with some patient troubleshooting, you'll have a real chance at figuring it out. Remember to always check your engine idle with the air conditioning and defroster turned off, as both of these systems are designed to change the idle when they are on due to the air conditioning system's demands on the engine.

Aug 25, 2017 | Cars & Trucks

1 Answer

1994 Chevy 3500hd 6.5 turbo diesel starts then stalls. I have to pump the gas pedal a lot before it starts again. Once started, it runs rough. Specially when I step on the pedal.


As there is no connection between the accelerator pedal and the fuel system then pumping the pedal will have no effect.. I would be checking and bleeding the fuel system from the filter to the pump and checking for a leak in the fuel supply system. Hard starting and running rough is an indication of air in the pump and in the lines to the injectors.

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1 Answer

1993 Ford F150 FUEL PROBLEM


Sounds like one of the injectors is stuck open, or the fuel pressure regulator is faulty.
You can disable the fuel pump and see if it clears up right before it runs out of fuel pressure. You can also check the spark plugs for ones that are fuel soaked.

Dec 19, 2012 | 1993 Ford F150 SuperCab

1 Answer

Car stalled and will not restart


It is possible to have fuel pressure and have injectors that are completely closed. There are light testers that plug into the injector harness to check the pulse to open an injector. Available at autoparts with Tool loaner program.

Try starting fluid to see if it wants to run, If it does, then injectors are not opening, then find cause like camshaft sensor. At that point, like other Expert said, it could be Vacuum leak.

Will not turn over can mean several things. Is it cranking? Is it engaging and not moving the engine? If the starter is not moving then you have to go through the interlocks with brake pedal and shifter. But these work after the engine runs and would not cause it to stall.

Try the starting fluid and see if the spark is working, then shift to fuel delivery if it tries to start.

Sep 25, 2012 | 2001 Nissan Altima

1 Answer

Sunfire runs rough at idle then seems to flood out to where it cant stay at a steady rpm when u adjust the gas pedal. will stall after idling for long time. fuel press reg seems fine. unhooked battery


the hole in the filler neck won`t cause this problem.do you have a check engine light on.this could set the light on as it can affect the evap/tank pressure sensors vacume.check for codes in the pcm(computer).rough running can be caused by bad plugs/wires compression,injector problems.timing sensors,anything to do with fuel or ignition.check for codes then check the other items.

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2003 SATURN VUE SERIVE ENGINE SOON LIGHT IS BLINKING ON AND OFF RAN THE OBDII READER AND CODE P0304 CYLINDER MISFIRE CAME UP I CHANGE SPARK PLUGS AND BOOTS BUT CAR STILL DRIVES ROUGH SHAKES AND WHEN PARKED...


The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.

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Driving 60mph power drops as though out of gas. Coast 2-300 yds pump gas pedal van back to normal. Now at home it starts then stalls, will only run 5-10 seconds. New plugs&wires distributor cap and...


signs of a bad fuel pressure regulator. the vehicle runs rough, the engine will not start usually in the mornings. many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. black soot on plugs, blake smoke from tailpipe, running rough, stalling. you could have residue in fuel tank and need to change fuel filter again. have a very good day !!

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it looks like your engine is having an over rich fuel mixture maybe, thatswhy when you press the pedal to the floor it starts becouse you allow lots of air to help clean the mixture while cranking, also you should have black smoke in the tailpipe until it cleans up and runs fine, i think youre having a leak in one our more injectors you should check them first for proper seal under pressure these is done in an injector test machine, second it may be a defective map sensor these trucks some times have a bad map and dont give a MIL (malfunction indacator lamp) and last but more rare to be is a blocked fuel pressure regulator chek fuel pressure it should be between 38 and 45 psi and it shoul hold these pressure when you turn off the engine if pressure drops fast its injector seal problems or fuel pump check

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1 Answer

1997 gmc k1500 seems to be running rich, very rich


If the engine is trying to flood, it will kill the engine. If you have the spider fuel system, it is noted for problems.
If it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure, also, check fuel injector pulse.
I don't know if this may be a problem? below
camshaft retard offset-1jibdyka02hdyoscptb5vkje-3-0.jpg

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