Question about 1994 Mitsubishi Montero

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Glow plugs stopped working on a pajero 2.8td 1994 model, plugs and buzz bar are ok.

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  • neil newington May 11, 2010

    MY 2.8 MITSUBISHI CHALLENGER MAKES A SOUND LIKE BIG ENDS BUT ISNT BIG END, ONLY AT ABOUT 1300 REVS AND PUFFS OUT SMOKE AT THAT TIME OF THE SOUND, DRIVES OK PASSED THEM REVS OR UNDER THEM REVS WITH NO SOUNDS AT ALL ????

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My glow rail would come on for a very short time, then turn off (less than 1 second).
Replaced the control wire for the glow relay, with a test lead from battery to relay control terminal - relay was working fine (relay is between batteries).

Checked the engine temperature sensor (located on top of the housing where the top radiator hose attaches to the engine).
Take out and test in a pot of water (need a 19mm deep socket to remove).
At 0 deg C should be 8.6K ohms
At 20 deg C should be 3.25K ohms
At 40 deg C should be 1.5 K ohms
At 80 deg C should be 300 ohms
I replaced the temperature sensor with a 8.2K ohm resistor (engine cold).
Then tried with a 1.2K ohm resistor (engine hot).
Each time I tested the glow rail at the relay (with a multimeter) it would turn off after about 12-14 seconds, which is normal, to protect the glow plugs and battery drain (they come on again when engine is starting).

When I put the temperature sensor back in, the glow rail was working fine again - only thing I can think of is that the contact between the sensor and the plug, may have had a oxide formed and caused a high resistance or open circuit, indicating to the glow controller that the engine was hot and did not need glow activation.
So try taking the plug off the temperature sensor, and reattaching it again it might be all it needs, to clean its contacts.

Posted on Feb 06, 2010

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Check the timer

Posted on Feb 01, 2010

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