Question about Jeep 1999 Grand Cherokee Laredo

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What would cause vehicle to have rough idle,sputter, backfire, and stall?

I replaced the fuel filter because the fuel from the fuel rail was brown. Fuel now looks good, but no change in how the vehicle runs. Also sounds like it may have a vacuum leak, and seems like it is getting too much air.

Posted by Anonymous on

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Check the fuel pressure and flow ,if ok check hi cables and plugs, the injectors have a gauze filter under the inlet fuel connecter , if the fuel was very dirty they may be clogged.

Posted on Mar 31, 2015

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Posted on Jan 02, 2017

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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.

Sep 28, 2016 | AC Cars & Trucks

1 Answer

Turning on the a/c stalls the engine


Hi,

I think this is a vacuum related problem. You could look carefully at the big flexible connection tube from the air cleaner to the intake body, for splits.

I had a Toyota in which this tube went hard with age and split underneath, and produced a rough idle.

Another possiblity is that the air conditioning idle-up vacuum switching valve has failed. This should operate when you turn on the A/C, to raise idle to about 900 RPM or so. They often malfunction only when they get hot, in Toyotas, so they are hard to diagnose. It has to be taken off the engine and tested with a 12V supply, when warmed.

I don't think it would be the fuel filter, as that should last the life of the engine.

It is possible also that the fuel pressure regulator, or overpressure fuel return valve, on the fuel supply rail have malfunctioned. To diagnose these you need to measure fuel pressure with a gauge.

Hope this helps

Nov 09, 2011 | 1995 Toyota Camry

1 Answer

Vehicle idle's fine but when you step on the gas it spits and sputters and backfires it is not out of time, new timing chain.


Sounds like it might be caused by low fuel pressure to the injectors. Maybe the fuel filter needs to be replaced. If that doesn't help, then it might also be the electric fuel pump in the gas tank.

Mar 13, 2011 | 1998 GMC Sonoma

1 Answer

97 kia sephia, replaced battery, plugs, wires, cap, rotor, air filter, fuel filter, added heet water removal and lucas fuel injector. It sputters, backfires/pops when accelerating and it has no power,...


As you have replaced all the obvious things that could cause the symptoms it may be a good idea to have a cylinder compression test done , if comes back OK i'd try a fuel addative , one that covers the catalytic convertor , as there are many sensor's involved in the fuel/exhaust system as you know , this addative will clean any residue affecting there reading's , hope this helps

Apr 06, 2017 | 1997 Kia Sephia

1 Answer

Car would not start after beginning to idle rough and then stalling out. AAMCO said that it was the fuel pump and wanted to change fuel pump and module. I had the pump changed but not the module, the...


Hello. The fuel pump module and the relay are totally separate parts. But both necessary for the fuel to be pumped at the correct times. YES that fuel system needs to be purged and the spark plugs, fuel filter and air filter all need to be changed. That brown color is most likely a combination of water, rust and gas. Regards, Joe
PS if you want more info about your fuel system go to this link:
http://www.v8sho.com/SHO/fuelpump.html

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1 Answer

After unusual below freezing weather here in california my 94 prizm is idling really rough and sputters in gear what might be the problem


Sounds like water in the gas. Colder temperatures can lead to condensation in the gas tank. Water then enters the fuel line, causing sputtering, rough idle, and occasional stalling. Try a bottle of Dri-Gas or other similar product with your next fill up. If the problem persists, you may need to change your fuel filter.

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I just bought a 91 honda accord se and when you go to stop it stalls or suts off. any ideas of what may be causing this


Check your 91 Accord's ignition coil. The coil goes bad at apprx. 150k miles and cause the car to run rough, hard to start(long cranking time) in the morning, stall after the vehicle has warmed up, cut out while driving and backfire horribly when accelerating from a standstill.

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Sputtering backfiring, stalling randomly when i engage the clutch. help!


everytime i try to start my truck, it turns over then stalls out on me. any idea?

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