Question about 1999 Jeep Grand Cherokee

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Fuel pressure rail

4.0 litre engine .when engine is idle for ten minute it goes off

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  • yadayada
    yadayada May 11, 2010

    Kinda unclear what you are asking, what does this have to do with the fuel rail?

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Is remote start avtivated?

Posted on Nov 11, 2008

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I have a Nissan Maxima QX 1996 model. Only in the morning (but the weather is already hot!) at the first time I tried the engine is not starting... Battery and starter motor is working for minutes and...


You migh have an Injector leak down problem, the fuel rail goes empty and while you keep cranking the fuel rail fills up building pressure and then the engine starts, this normally happens if the vehicle is parked for more then 3-4 hours.

Aug 11, 2011 | 1996 Nissan Maxima

3 Answers

1999 Grand Cherokee Limited, 95,000 miles, 6 cyl engine The Jeep stumbles, coughs and almost backfires when slowly accelerating from an idle speed. This occurs during the first 5-10 minutes the vehicle...


Hi.

If fuel pressure is low and you have already replaced the fuel pump, then the problem is usually the fuel pressure regulator. The pressure regulator is in same assembly with fuel filter. The assembly is located to the fuel tank, bolted to the truck's frame. The pressure is tested connecting a gauge like this : Set Sealey VSE952 to the port on the fuel rail. The pressure on Grand Cherokee must be around 49 psi plus or minus 5 psi. If engine runs but pressure is below 44.2 psi , check for a blockage in fuel supply line between fuel rail and fuel pump module (e.g.kinked line). If the line is not blocked, replace fuel pressure regulator and filter. Test pressure with and without fuel cap on.

Another test to be done is reading pressure, then shutting the engine off with the gauge connected. If pressure goes down too quick, then the regulator is defective. After 5 minutes the pressure should not go below 24 psi. If it does replace the regulator.

If regulator is OK check for leaks at the injectors that can cause fuel pressure drops.To check for injectors leakage clamp off the rubber hose of the pressure gauge tool between fuel rail and the port. If pressure staysr above 24 psi and before was dropping, then a fuel injector or the fuel rail is leaking.

Below a diagram representing the fuel rail and test port. The engines from same years like your six cylinder have the port and rail in the same position.


ginko_260.gif



Regards.

Ginko

Aug 04, 2011 | 1999 Jeep Grand Cherokee

1 Answer

Tourqe specs for 2.8 liter motor.


Camshaft Sprocket: 15-20ftlbs
Camshaft Rear Cover: 6-9ftlbs
Torsional Dampener: 67-85ftlbs
Exhaust Manifold: 15-23ftlbs
Water Pump: 6-9ftlbs
Thermostat Housing: 15-23ftlbs
Intake Manifold: 23ftlbs
Timing Chain Dampener: 14-19ftlbs
Rocker Arm Cover: 6-9ftlbs
Rock Arm Nuts: 15-20ftlbs
Oil Pan: 15-23ftlbs(M8 Bolts) 6-9ftlbs(M6 Bolts)
Main Bearing Caps: 63-83ftlbs
Connecting Rod Main Cap: 34-40ftlbs
Cylinder Heads: 33ftlbs(+ an additional 1/4 Turn)
Engine Mounts: 34ftlbs
Oil Filter Adapter to Engine: 34ftlbs
Oil Filter Adapter Bolt: 63ftlbs
Oil Pressure Switch: 10ftlbs
Oil Pump Drive Bolt: 25ftlbs
Oil Pump Mounting Bolts: 30ftlbs
EGR Valve: 19ftlbs
EGR Tube Nut: 19ftlbs
Fuel Line Nuts: 17ftlbs
Fuel Rail Attaching Bolts: 88in.lbs
Fuel Rail Inlet Fitting: 35ftlbs
Fuel Rail Mounting Bracket: 28in.lbs
Fuel Rail Outlet Fitting: 30ftlbs
Fuel Pressure Connector: 88in.lbs
Fuel Pressure Regulator Bracket: 28in.lbs
Idle Air Control Valve: 30in.lbs
Idle Air/Vacuum Signal Housing: 30in.lbs
Intake Air Plenum Bolts: 16ftlbs
Thorottle Body Attaching Bolts: 18ftlbs
Throttle Position Sensor: 18in.lbs
Crankshaft Sensor: 71in.lbs
DIS Assembly to Block: 15-22ftlbs
Knock Sensor: 14ftlbs

Dec 15, 2010 | 1989 Chevrolet Celebrity

3 Answers

2000 Malibu Starts then looses fuel pressure I have replaced the fuel pump and the fuel pump relay still same problem


Keep in mind that you have several components there:
- Fuel Pump Sender Assembly,
- Fuel Pressure Regulator,
- Fuel Rail Assembly, and
- Fuel Injectors.

1.- Fuel Pump (Sender Assembly) - TESTING
Refer to the accompanying charts for fuel pump diagnosis and testing.

The fuel injection system remains under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.

eb744a2.jpg

Fig. 3.1L engine OBD system check to be done before fuel pump relay circuit diagnosis


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Fig. 3.1L engine fuel pump relay circuit diagnosis (1 of 2)


b3b739d.jpg

Fig. 3.1L engine fuel pump relay circuit diagnosis (2 of 2)


db78a73.jpg

Fig. View of the fuel pressure test port (Schrader valve)-3.1L engine

A - 3.1L engine fuel system pressure test (1 of 4)
B - 3.1L engine fuel system pressure test (2 of 4)
C - 3.1L engine fuel system pressure test (3 of 4)
D - 3.1L engine fuel system pressure test (4 of 4)

c8a9798.jpg

Fig. The fuel pump/fuel sender module assembly is mounted in the fuel tank


2.-
Fuel Pressure Regulator - REMOVAL & INSTALLATION

(the fuel pressure regulator, which is located on the fuel rail assembly)

NOTE:
Before removing the fuel regulator assembly, place a clean shop towel under the regulator to catch any fuel drips

  1. Properly relieve the fuel system pressure.
  2. If not done already, disconnect the negative battery cable.
  3. On the 3.1L engine, remove the intake manifold plenum, as outlined in .
  4. On the 2.4L engine, remove the fuel rail. Refer to procedure earlier in this section.
  5. Detach the vacuum line from the regulator.
  6. Place a shop towel under the regulator to catch any fuel that may drip out. Unfasten the fuel pressure regulator retaining screw, then remove the regulator by twisting and pulling it from the fuel rail.
  7. Remove and discard the O-ring seal. Inspect the filter screen for contamination and replace if necessary.
To install:
  1. Prior to assembling the pressure regulator to the fuel rail, lubricate the new rail-to-regulator O-ring seal with clean engine oil.
  2. Place the O-ring on the pressure regulator and install the pressure regulator to the fuel rail.
  3. Install the retainer or coat the regulator mounting screws with an approved thread locking compound and secure the pressure regulator in place. Tighten the mounting screw to 76 inch lbs. (8.5 Nm).
  4. If removed, install the fuel rail assembly to the engine.
WARNING The fuel return pipe must be connected before tightening the regulator retaining screw to prevent the regulator from rotating. Rotation of the regulator could damage the retainer and spacer bracket and lead to a fuel leak at the regulator inlet.
  1. Connect the fuel feed line and return line to the fuel rail assembly, use a backup wrench on the fittings to prevent turning.
  2. Attach the vacuum line to the regulator.
  3. On the 3.1L engine, install the intake manifold plenum.
  4. Connect the negative battery cable. Turn the ignition to the ON position for two seconds, then turn it to the OFF position for ten seconds. Turn again to the ON position and check for fuel leaks.

continue...

May 24, 2010 | Chevrolet Malibu Cars & Trucks

1 Answer

Engine idles erractically.1990 Olds Cutlass Ciera, 3.3 L engine


purchase a fuel pressure tester and screw it on to the fuel rail schrader valve access point turn key on there should be 30 - 40 lbs. of pressure present if not either the fuel pressure regulator is bad ( located near fuel rail) or the fuel pump has become weak.

Sep 11, 2009 | 1990 Oldsmobile Cutlass Ciera

1 Answer

1998 ford winstar 3 litre keeps stalling new fuel pump ,new filter , pressure at rail, no codes, have spark any ideas? thanks


WELL THIS VAN HAS MANY ISUSES NEED TO JECK FOR VACUME LEAK AT IN TAKE AND THE PLENUM IF ITS PLASTICK THEY TEN TO CRACK OR THEY HAVE GASKET FAILER VERY COMEN ON THIS CAR OR YOU MAY NEED TO CHECK EGR VALVE IF STUCK OPEN IT WONT IDLE THEN YOU HAVE THE IAC VALVE IDLE AIR CONTROL VALVE YOU CAN USE BRAKE CLEAN AROUND IN TAKE BUT BE VERY CARFULL FLAMIBAL SHOULD HAVE FIRE EXTINGSHER NEAR YOOU WHEN DOING THIS

Aug 19, 2009 | Ford Windstar Cars & Trucks

1 Answer

04 jeep wrangler hard to start, runs fine when running.


does it have a vacuum controlled fuel pressure regulator, if so check it for leaks into the intake. Also check fuel pressure

Feb 27, 2009 | 2005 Jeep Wrangler

1 Answer

1999 jeep c. 4.0 litre engine. Fuel drips from muffler wont start


How is this car running? Remove the vacuum line from the pressure regulator on the fuel rail and check to see if there is any gas coming out of the line. If you see gas then the regulator is bad.

Dec 13, 2008 | 1999 Jeep Cherokee 4WD

1 Answer

4.0 litre engine, auto transmission, long cranking time before it starts. When it starts there is a smell of gsoline, rich.


CHECK INJECTOR LEAK DOWN. INSTALL FUEL PRESSURE GAUGE, PRESSURIZE FUEL SYSTEM BY LETTING ENGINE RUN FOR A MINUTE, SHUT ENGINE DOWN, AND OBSERVE FUEL PRESSURE. IT SHOULD NOT DROP BY MORE THAN 15-20 PSI IN A HALF HOUR. IF IT DOES PRESSURIZE FUEL RAIL AGAIN AND REMOVE FUEL RAIL WITH INJECTORS STILL ATTACHED AND LOOK FOR FUEL DRIPPING OUT OF INJECTORS. IF FUEL IS DRIPPING REPLACE INJECTORS AND SEALS.

Aug 12, 2008 | 1996 Jeep Cherokee Sport

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