Question about 2002 Lincoln Navigator

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FUEL SYSTEM MY VEHICLE JUMPS WHEN IT AT A IDLE DO I HAVE A FUEL PROBLEM

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  • jessie395 Sep 25, 2008

    The Engine light is on when i'm at a stop sign it starts jumping erratcly could it be i've been putting the wrong gas or need to change my fuel lilter.

  • jessie395 Sep 25, 2008

    So it has to go too the shop for this it does'nt do it all the time do you still think it's a cylinder.

  • jessie395 Sep 26, 2008

    Paul you have been very helpful thank you for your time.

  • paul erickson
    paul erickson May 11, 2010

    is your engine light on?
    do you notice it at any other time?


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You have a cylinder not running
you need to get the codes pulled to see what cyl.

Posted on Sep 25, 2008

  • paul erickson
    paul erickson Sep 25, 2008

    you can stop by a auto parts store and they can run the scanner on your truck,
    im not guessing im trying to narrow it down. so you dont spend money on parts you dont need.
    later paul


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Rough idle in drive, correct rpm


Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
  • Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn. Fuel injectors have tiny nozzles to spray the fuel into the cylinder and they can become clogged over time. clogged or failing fuel injector creates a lack of fuel in the vehicle's engine. This can cause a rough idle, it can also cause symptoms such as slow acceleration or the car not feeling as if it has enough power. If the problem is addressed early, it is possible to clean the injectors, which will restore them to full function. If this condition is not addressed in a timely manner the injectors will need to be replaced. Incorrect Idle Speed: While the average idle speed falls between 600 to 1,000 RPMs, if your vehicle is experiencing a rough idle it could be due to an incorrect idle speed setting. A trained mechanic can easily adjust the idle speed, and it should stay at the proper speed. If an adjusted idle speed becomes inconsistent or changes at random intervals there may be a bigger problem that needs to be explored. Vacuum Leak: If the vacuum system has a leak, it can seriously affect the ability of the vehicle's computer to regulate the air to fuel ratio. This can lead to a rough idle and if the problem is not addressed the car may experience slow acceleration and a lack of power. Vacuum leaks should be inspected and repaired immediately. Incorrectly Installed or Damaged Plugs: Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle's engine may vibrate or there may be slipping or straining sounds coming from the engine. Defective or Clogged Fuel Pump: A rough idle can be related to fuel delivery issues. The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems. The job of the fuel filter is to screen out contaminants in the fuel, over time it will become clogged and need to be replaced. A rough idle is one symptom of a clogged fuel filter. Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs. Defective Airflow Sensor: A defective airflow sensor can be responsible for a rough idle. A mass airflow sensor detects the amount of air coming into the fuel injection system and sends that information to the vehicle's computer. The computer uses that data to deliver the proper amount of fuel to the air in the vehicle. Over time these sensors can malfunction or become dirty. One of the first symptoms of a malfunctioning airflow sensor is a rough idle. The car may also accelerate slowly and even stutter or stall as the problem progresses. Dirty Oxygen Sensor: Oxygen sensors measure how rich or lean the gases are as they exit the combustion chamber. Depending on the results, the amount of fuel entering the engine is adjusted by the vehicle computer. The ultimate goal is to maintain an ideal mixture that produces the lowest emissions. A dirty or failing oxygen sensor will usually trigger the check engine light and can lead to a rough idle, lower fuel efficiency and failed emission test.

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1 Answer

Going down the highway at 55-60 mph I just barely tap the gas and the vehicle jumps, I press the gas hard and it stops, leave off the gas check engine light blinks and jumping continues.


A blinking light usually means exhaust system probably catalic converter. You most likely have a small blockage in it which means exhaust can't get out correctly. Have vehicle scanned at autozone or similar.

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1 Answer

I cleaned out my choke with correct spray and now just replaced my idle air control sensor but the car is still


You are equipt with a idle speed control motor.There is no way cleaning is going to clear it,When the RPM jumps it is either working and trying to compensate for a vacuum leak.Have the vehicle running as it jumps up and down feel the EGR is it hot to touch? Becuase that can cause the jumping RPM,Check the PCV valve with the car running plug it does the RPM stabalize? If it does replace PCV. You are searching for a vacuum leak

Mar 10, 2012 | Cars & Trucks

1 Answer

2000 chevorlet silverado 2500 w 6.0 liter. Vehicle dies after start has rough idle and smells like fuel under heavy acceleration. Vehicle also bogs down when stopping heavier then usually. I have tested...


Sounds like a ruptured diaphram in the fuel pressure regulator. Fuel is being sucked into the motor through the vacuum line. remove vacuum line off regulator and see if there is fuel, or odor of fuel in the line , if so , the regulator is bad. Good Luck

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1 Answer

AT IDLE TRK'S RPM NEEDLE JUMPS ALL OVER PUT A


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My 1997 Mazda b4000 will not idle. I have replaced the ERG, and the IACV. The problem is still there. The trucks runs good other than the idle. One other thing, with the AC on the vehicle will idle. This...


Ok, you need to keep checking other related items. How is the charging system, tune-up history, vacuum lines, braking (vacuum booster), and the fuel system (how is the fuel line pressure and has there been any issues with water in the fuel)?

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1 Answer

High idle/low idle pattern


This issue is caused by the egr valve being stuck open, more than likely. Just remove it and clean the plunger on it. Also clean out the two ports that are in the intake. Check out saturnfans.com for more information. I hope this helps.

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