Van acts like the fuel filter is plugged, and losses power when going up hills

There are a few possible reasons why your 2003 Mitsubishi Express van might be having a lack of power, losing throttle, and stalling. Bad spark plugs: Spark plugs are responsible for igniting the fuel in your van's engine. If the spark plugs are bad, they will not be able to ignite the fuel properly, which can lead to a loss of power, stalling, and other problems. Bad fuel filter: The fuel filter removes impurities from the fuel before it enters the engine. If the fuel filter is clogged, it will restrict the flow of fuel to the engine, which can also lead to a loss of power, stalling, and other problems. Low compression: Low compression can also cause a loss of power and stalling. Compression is the force that pushes the piston down in the cylinder, which is necessary for the engine to run properly. If the compression is low, it will be harder for the pistons to move, which can lead to a loss of power and stalling. Clogged injectors: Fuel injectors deliver fuel to the engine in a fine mist. If the injectors are clogged, they will not be able to deliver the fuel properly, which can lead to a loss of power, stalling, and other problems. Mass air flow sensor: The mass air flow sensor measures the amount of air entering the engine. If the mass air flow sensor is faulty, it can provide the wrong information to the engine's computer, which can lead to a loss of power, stalling, and other problems. Throttle body: The throttle body controls the amount of air that enters the engine. If the throttle body is dirty or malfunctioning, it can restrict the flow of air to the engine, which can lead to a loss of power, stalling, and other problems. If you are experiencing these symptoms, it is important to have your van diagnosed by a qualified mechanic to determine the root cause of the problem. Once the cause of the problem has been identified, the mechanic can recommend the necessary repairs. Here are some tips to help prevent these problems from happening in the future: Change your spark plugs and fuel filter according to the manufacturer's recommendations. Keep your van's engine clean and well-maintained. Avoid running your van on low fuel. If you notice any problems with your van's performance, have it checked out by a qualified mechanic as soon as possible.

When was the last time you changed the fuel filter or air filter...common causes are air filter, or blocked air intake, dirty carb, bad plug, wires, distributer, distributer button, fuel filter, water in gas, old gas,plugged exhaust pipe and last but not least and believe it or not too much dirt under the gas peddle.... and in one case passing cable fell off the carb.

First check for any codes, then test vacuum with a good vac guage. When reving engine the vacuum should drop and then climb back up. Check for vacume leaks by spraying carb cleaner at any vacume hoses and intake areas but not at air filter.

then also check compression as well as look at spark plugs to see that they are all tan and no differences in any one. Go to YouTube and search for how to test engine with a vacuum gauge.

Most any problem with an engine can be diagnosed with a vacuums gauge but do use a second test method as you have learned replacing parts hoping to fix a problem is costly.

My best guess is a clogger/restricted fuel filter. Even if that is not your problem, you will feel good about changing it out. A lack of fuel will definately cause your loss of power.

You may also consider changing plugs, wires and other commom wear items.

Good luck!!!

Power loss can result from dirty air filter, plugged fuel filter, and excessive spark plug gap. Check these things and if stilll stumped get back to me.

SOUNDS LIKE YOU HAVE IT NARROWED DOWN TO THE EXHAUST SYSTEM.THE CONVERTER IS PROBABLY PLUGGED,CHECK THE TEMPS. COMING IN AND OUT.THEY SHOULD ONLY BE A FEW DEGREES DIFFERANT,IF THEY'RE ALOT HIGHER COMEING OUT IT'S PLUGGED.

change your fuel filter it may have imputities in the fuel causing the fuel flow problems

well i think the piston ring are already loose, causing insufficient air compression leading to lower power especially on uphill tracks. check also for the air-fuel ratio! too much fuel usually is the cause for thick smoke emission; too much air, causes also less power.

fuel pump is bad. they are under extented warranty from ford. take to dealer and "insist" they change it. there is service bulletin on this, but dealers often play "dumb".

it probably does need a tranny fluid change, but this wouldn't account for loss of power. The tranny is only reacting to the power provided by the engine. I'd think it's starting with power loss from the engine. The easiest and cheapest place to start is the fuel filter. It's probably getting plugged and restricting fuel flow when more power is required - as in going up a hill. The filter is about 8 to 12 dollars. The auto parts store can tell you where it's located.