Question about Mitsubishi Lancer

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I have a 1998 mitsubishi lancer with a 4g93 engine. when the car is warm it sometimes doesnt idle at a stable level. EG when the car is in neutral the revs drop as low as 450 then it revs itself back up to about 700-750 revs which it what it used to be at when warm. But it then drops and then rises again. when i rev the engine the brightness of the lights on the car get brighter so i am thinking it could be something to do with the alternator. i first noticed this problem about 1 day after i was driving in heavy rain and accidently went through a large puddle. any comments would be helpful, thanks

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Posted on Jan 02, 2017

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SOURCE: Lancer cedia 2001 4g93 1800cc

in addition to what the wiz has said it can also be cause by a faulty water pump (usually mounted on the front of the engine & can be easiliy found by looking for the pullies & belts driven by the engine). Water pump faults can include a faulty or loose pully for the pump ie broken belt, or too much "play" in the belt pully assembly, a leaking water pump, blown gaskets/seals. In short anything stopping or restricting the flow of coolant from your radiator to the engine block is going to cause over heating so also be aware of dodgy radiators & blocked or damaged lines ect. You should be able to easily trace the hoses going from your radiator, engine & pump as this is the path water takes to cool the engine.

Enjoy & good luck!

Posted on Jan 12, 2009

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SOURCE: 2006 dodge grand caravan does it have a engine rev limiter?

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Posted on Sep 13, 2009

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SOURCE: mitsubishi lancer service engine light comes on and rpm's high

same as mine
2000 Lancer cedia

Posted on Oct 19, 2009

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SOURCE: Car idles erratically-surges and revs up and down

First use a scanner and pull the codes out of the computer.
After you do that go to the shop manual and do exactly what it tells you to do to verify the item/items the code/codes are directing you to.Do the necessary repairs and erase the codes.
Surging and irratic idel as you described are due to a worn/dirty "Fast idle Cam Valve". This valve usually can be found on the fire wall somewhere behind air intake plentium.This valve can be easily tested by removing the two small screws that hold the top plate down and squirting a drop of oil into the valve, then relace the top plate and start the vehicle. The surging should disappear.
If it does you have two options a) clean it with gum out and hope it worked.b) replace it Its not that pricey and fairly simple to do. Use the shop manual if you decide to do this. Replacement is the better option.
With regards to the temp. gauge on dash board its either the wiring , the temp sensor its attached to, or the gauge its self.
If it has one wire coming from the temp sensor ,put the key in the ignition turn to on position BUT DON"T start the vehicle . Then ground the wire from the sensor and look at the gauge if it moved to the overheat position the gauge works and the wiring is good . Therefore, the sensor is most likely the culprit. If there is more than one wire coming from that sensor use the shop manual to test the items invovled.
If you still believe the engine isn't getting warm, let it idle for a while and turn on the heater. If your getting heat your ok. To double check it without any fancy equiptment see if the cooling fan comes on. Good luck

Posted on Mar 04, 2010

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