Question about 1994 Mitsubishi Montero

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Problem on the rpm

Hi there, i am mario from Mozambique.when i am travelling on a hi speed ( 120 to 140 km/h ) after a one 1h or less, when i make a stop, the car remains between 2-3 rpm and it decreases it self after a long stop. even when i use the brakes the rpm remains on that level, the car wants to keep rolling it self even with my foot on the brakes. when i am travelling using the AC it does not happens. my car is a mitsubishi pajero ( montero ) v6 3500 dhoc 24v 1994. what shoul i do to fix the problem?

regards,

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  • mnhatitima Jun 11, 2009

    many thanks mr Debcalcampbe, i will talk to my mechanic and let him know this solution. meanwhile, i want to know if this problem can damage something on the car or even if the car could break it self while am travelling or something. in other words, how this problem can damage my car if it persists.

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Find the idle valve and remove it, cleaning the tip of it with a rag. Also clean the inside of the throttle plate on the intake manifold, in case it's hanging up and not fully closing when you come to a stop. The idle valve is located on the intake manifold. They're known for sticking when deposits from the engine intake system build up on the tips of the valve/plunger unit. You may need to use a bit of a solvent like alcohol, mineral spirits, or kerosene on a rag to gently remove the deposits off the idle valve or the inside of the throttle body/plate. Lastly, make sure you don't have a sticking vacuum advance unit inside your distributor[if you actually have a distributor on your Pajero] The plate for the advance unit can stick inside the distributor, keeping the unit advanced, but, I would be surprised if the RPMs were staying above 1500 at idle with a sticking advance unit. Hope this helps you out.

Posted on Jun 11, 2009

  • debcalcampbe Jun 12, 2009

    Excessive High Idle RPM leads to wasted fuel, wasted brake pads since you're struggling more often to hold the vehicle still when you're trying to stop it and more wear and tear on the engine and transmission. The key to your problem is the line comment, "When I use the A/C, it doesn't happen". When using A/C on a fuel injected vehicle with electronic idle control, you're sending a new signal to the engine ecu that controls the idle speed via its idle valve. Something is probably going on with the idle control system if using the A/C keeps things normal, and not using it creates or allows your high idle issue to happen. If if was an O2 sensor issue, it should happen regardless if the A/C was on or not. The A/C adds a load to the engine, but your complaint is while at a stop, with the idle control system not controlling the RPM's.

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Could be o2 sensor

Posted on Jun 02, 2009

  • fred syn Jun 12, 2009

    it might be a dirty oxygen sensor, my mits does the same thing some times

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PROCEDURE 1
EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
Inspection Conditions
Engine coolant temperature: 30°C (75°F) or less (The engine is stopped before the test drive is started).
Atmospheric temperature: 5 - 30°C (41 - 113°F).
Condition of A/T: Selector lever D range.
Fuel remained in fuel tank: 30 - 50% is recommended.
Time required: 16 minutes or less after started the engine.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position. Well be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 16 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

PROCEDURE 2
FUEL TRIM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: -10 - 60°C (14 - 140°F).
Condition of A/T: Selector lever D range.
Time required: 30 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 30 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 3
CATALYTIC CONVERTER MONITOR
Drive Cycle Pattern
Inspection Conditions
Atmospheric temperature: -10°C (14°F) or more.
Condition of A/T: Selector lever D range.
Engine coolant temperature: Not set.
Time required: 16 minutes or more.
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Test Procedure
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Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
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While traveling at 56 - 80 km/h (35 - 50 mph) for 10 minutes or more, fully close the throttle at least once in 2 minutes and decelerate for 10 seconds or more.
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PROCEDURE 4
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Test Procedure
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While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 56 - 80 km/h (35 - 50 mph) and travel for 16 minutes or more.
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Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 5
EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
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Inspection Conditions
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Atmospheric temperature: 5 - 60°C (41 - 140°F).
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Condition of A/T: Selector lever D range.
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