Hi i have mitsubishi pinin 4x4 2.0 GDI engine, when starting on a warm engine it often has a 5 sec missfire then goes ,cold start no probs , its had full service mits main dealer only recently had new plugs platinum , oh i use premium fuel only 97oct & once a week give it 4 to 5 rpm to clear it out but am baffled why the odd missfire when warm?

Symptoms seem to show the engine is running rich, like the choke is on in a carb system. It could only mean it's hard to start after warm up and the plugs are always wet with fuel. This is normally cared for by the computer. When first started, computer places the engine into a "cold start" mode, raising the idle and giving it more fuel into the cylinders until engine is warm. Then the computer tells the engine to go to normal "run" mode and all is well. Now, if the temperature sending unit/sensor cannot tell the computer the engine is warm because it is faulty, stuck in a closed position, the computer doesn't get this message because it doesn't get sent out. I feel that if you replace the said sending unit/sensor, you will see that the black smoke/unburnt fuel has stopped after warm-up. Then all is well in Pajerotown.

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Sounds like a high voltage ark through either through a crack in the distributor, or through a crack in the wires to it or near one of the spark plug boots. It probably will be visible as a blue spark at night. Otherwise you might just replace the cap and wires!

i have a mitsubishi pagero exceed gdi v6 3500cc it stall the engine and responde well while cold but on load it starts to die. somebody told me to replace the fuel enjection pump, but i don´t know where to buy. will that solve my problem.
please help me on that.

I had the same poor idleing car was stoping at every junction,so yesterday i had the throttle body off and i have cleaned it inside by the flap including the flap the muc on there was unbelieveable now the car drives smooth no stalling issue no poor idleing!
Make sure u DONT take the sensors off either side otherwise u get in more problems.
Good luck.
Mik

Since you vehicle is 7 years old. The temperature is due for a change.

the temp sensor give the exact engine block temperature information to the computer (ECU).

An old sensor or sensor giving incorrect temp to the ECU will cause this problem.

The correct term is call close loop. When the engine at start up the computer will only count on the temp sensor to report temp.

When temp is reaching 195F,the mode change to open loop. All sensors comes into play and at the point the fuel inject will scale down for the warm up state.

Running rich condition can be cause by an old temp. sensor.

Change the sensor and the RICH condition after warm up will go away.

Hi,
is your car a GDI engine? If it is GDI you can't really hear the pump working when you put ign on.
Give me some details and I might be able to guide you there.
Chassis, engine numbers, GDI ??

sounds like the cabbruter is losing pressure cheak tubes may be lose or damaged

try resetting the base idle,disconnect the battery,leave for ten minutes,reconnect the battery,start the car and do not rev the engine for ten minutes.hope this helps