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I changed the engine on my io 4g94 but the engine would not idle and go off changed the pressure pump and the throttle please help

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  • Cars & Trucks Expert
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If the engine was a s/h unit you will need to use the doner cars computer or change all sensors relays and solinoids from your old engine good luck PAUL@FIREFOX

Posted on Nov 11, 2014

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DIESELMUDDER
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SOURCE: Mitsubishi Pajero IO 4G94 GDI engine:I am changed

will engine start if u spray carb cleaner or start fluid in air intake hole ,?? if it wount then all the fuel pressure in the world wont fix an ing problem .

Posted on Oct 24, 2014

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Why is my '94 Camaro V6 idling too high?


Changing a fuel pump shouldn't affect the idle.Was it ok before the pump was changed? Look for any source of vacuum leak under the hood from the hoses causing unmetered air to enter the engine. Make sure the throttle is not stuck open slightly. Is the check engine light on? If so have the codes scanned for possibleTPS or IAC problems

May 03, 2015 | 1994 Chevrolet Camaro

4 Answers

I have a 99 geo metro.4 cyl no start condition.new fuel pump/filter.will start with ether and hold about 2000rpm if holding throttle..will not idle or start withought the ether...help please.


First off.... You have to make sure it IS getting fuel. Are you sure the fuel pump is getting 12volts... the fuel filter is installed in the right direction? Have you disconnected the supply line at the throttle bodt to verify fuel pressure and volume? If it starts with ether... there is definately a fuel supply issue from the tank

Apr 11, 2015 | Geo Metro Cars & Trucks

1 Answer

Mitsubishi Pajero IO 4G94 GDI engine:I am changed new fuel pump in tank,its pressure is good.And than I'm also test front fuel pressure pump too good.But engine isn't start to running.what's wrong in this...


will engine start if u spray carb cleaner or start fluid in air intake hole ,?? if it wount then all the fuel pressure in the world wont fix an ing problem .

Oct 24, 2014 | Mitsubishi Pajero Cars & Trucks

1 Answer

Hi just bought i999 1.6 audi a3 and it has started to pulse when idling and oil light comes on when engine reaches nornal temp what could this be please help


If by pulsing you mean that the idle is fluctuating up and down, this is caused by oil/sludge build up in the throttle valve. To rectify this remove the intake pipe at the throttle valve. Use engine cleaner/degreaser on a rag to clean out throttle valve around throttle butterfly. Open butterfly manually to assist access. The oil pressure light coming on is usually caused by the oil pump pick up becoming blocked by carbon and sludge in the oil sump. If you have a suitable oil pressure gauge, check the oil pressure at the oil switch. Oil pressure should be 3.5- 4 bar at 2000 rpm at operating temperature. If pressure ok, Pressure switch may be faulty. If pressure low you will have to remove oil sump and clean out or replace oil pump pick up. If not done, may result in major engine damage. Sludge and carbon build up caused by oil not being changed often enough. Best to use a synthetic oil.

Jun 13, 2010 | 2007 Audi A3

1 Answer

Fuel pressure low at pressure monitor


HI. There are some areas that will need to be checked for faults, in this case. Check the following:

1. Fuel filter- If this device is clogged, or faulty, it will decrease the flow of fuel to the injector assembly. If the filter hasn't been changed recently, this will be a good place to start.

2. Fuel pump- This device may be weak, or grounded poorly. check the ground, and all wires the link the pump to the power source. replace any corroded contacts and connectors. wires,as well, if needed.

3. Fuel pressure regulator- The fuel pressure regulator is used to keep the fuel pressure in the fuel rail consistent and change the fuel pressure depending on the throttle position. The fuel rail is in a fuel loop between the fuel pump feed and return lines. Because the fuel delivery requirements change depending on the engine's throttle position and engine loads, the fuel injection system must be able to adapt to meet the fuel requirements of the engine's operating conditions during idle, acceleration and steady cruising.The fuel pressure regulator has a small vacuum line attached to it that allows the pressure regulator to change the fuel pressure in the fuel loop depending upon the intake manifold pressure which changes as the throttle position changes. When the throttle is opened, the manifold vacuum pressure drops off, causing the pressure regulator to increase the fuel pressure in the fuel loop, which increases the amount of fuel delivery at the injectors to provide for the additional fuel needed for the engine to operate properly.At idle, the manifold vacuum increases and the demands for the rate of fuel delivery are decreased so the pressure regulator decreases the fuel pressure in the fuel loop.

1. Look for visible evidence of fuel leaks.
2. A pressure regulator can become defective due to foreign material or a ruined diaphragm.


The result will be hard starting, poor idle quality, and lack or power. Burned spark plugs can result from operating with a lean air/fuel mixture, as well. replace this device if faults exist.

Nov 18, 2009 | 2001 BMW 330

1 Answer

Olds alero 2.4 idle fuel pressure


most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Dec 10, 2008 | 1999 Oldsmobile Alero

1 Answer

1999 Dodge Ram 1500 Extended Cab 4x4


idle air control motor on back of throttle body maybe malfunctioning and not allowing it to idle

Oct 21, 2008 | 1998 Dodge Ram 1500 4WD

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