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This sounds like the Idle Air Control Valve. This is located on the throttle body, and it controls idle speed and the fuel/air ratio when the accelerator is disengaged. Another problem could be loss of fuel; try changing the fuel filter and having your fuel pump tested for proper pressure. If that's not the case, try checking your Fuel Pressure Regulator. There are a number of things you can do, but since you don't seem to have a Service Engine Soon Light, it's difficult to diagnose the problem.
Check to make sure you installed the fuel filter in the right direction for flow, if the vehicle was working fine before hand then your problem is located in something you replaced, if not have the fuel pump checked for flow rate it may be starting to get weak and needs to be changed.
I would recommend you try to perform a fuel system pressure test. The specifications are available by calling the dealer. It seems you have a fuel delivery problem, possibly a bad fuel driver module or pump and that is located in the fuel tank. Follow the precautions when performing the test. If you hard accelerated and the vehicle stumbles or has a "dead spot" on acceleration then it's a good indication that it's a fuel delivery issue. The reason for the speedo going wacky is because the vehicle is not performing properly !!
The engine runs as long as you maintain pressure on accelerator? The most probable cause is a clogged fuel filter. Once the filter becomes clogged, when you release the accelerator, there is not enough fuel pressure to maintain the proper amount of fuel through filter. Have the fuel filter replaced and that should clear the problem.
The fuel filter is located inside the fuel pump on a 2005 nissan altima. The fuel pump is under the back seat. You must remove the bottom cushion on the driver side. Before removing the fuel pump you must remove the negative battery cable and relieve fuel pressure. trouble with filters hesitation in starts could be some bogging and when acceleration poor fuel output but it depends on what ur car is doing?some of these same symptoms could be duel to idle air conrol valve controls idle and hesitation in acceleration
If the problem of your car is the fuel filter .You have to locate the fuel filter and prepare the equipment or tools to be used in checking the or repairing the fuel filters.there are two filters , the primary filter and the secondary filter.Disconnect the fuel lines at fuel filter observe safety practices. if the present fuel filter is dirty and not any more use full then replace and install new fuel filter. If the problem is the fuel lines then you have to locate the fuel pump then prepare the tools or equipment to be used in servicing the fuel lines.Visual inspection on duel line for learage.Disconnect lines at fuel pump and fuel tank.Use compress air to remove sediments on fuel lines .Re install fuel lines to the unit.Locate the fuel pump . Prepare the tools or equipment in repairing the fuel pump.So that fuel pump will operate properly. locate the fuel pump.Disconnect the fuel lines from the fuel pump.Remove fuel pump from the engine.Dis assemble fuel pump.Check daiphram for defects .Replace defective parts.Assemble and install fuel pump.If you don't have time to do it then it is advice. that you go to the toyota car shop and let the mechanic to do the job .One of the kind of engine that I studied as a mechanic are toyota 3K ,and 4K .
Hi, this is a common symptom of a clogged fuel filter that is straining the fuel pump itself.
When you accelerate, this initiates a rapid fuel flow through the lines. if the filter cant pass the proper amount, its will stall or hesitate the engine and cause sputtering or loss of power. due to this clogged filter, the pump cant keep up with your acceleration demands at this time. the reason for the power pick up upon De acceleration, is because the lower amount of fuel is able to pass through quite easily but, as soon as you demand more power, the clog will obstruct the more intense flow of fuel to the injectors.
Simply replacing the fuel filter and pump will fix this issue.