Question about Mitsubishi Montero

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94 montero with a 3.5 drops a cylinder or two under acceleration, also idles rough and at about 450 tom 500 rpm will die sometimes

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I would look at the plug wire's at night, this is when it is easy to see any leaky wires, there will be a glow around the bad wires, spraying them with water also helps to figure out which wires are at fault and causing a miss-fire

Posted on Sep 08, 2008

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Posted on Jan 02, 2017

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Acceleration hesitation


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Idles roughly, then low when stopped or in park, then dies. Decreasing gas mileage. Slow to accelerate


Sometimes that's caused by a vacuum leak near the manifold area.

Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
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2001 MONTERO SPORT RUN FINE,BUT DURING IDLE WHILE ON "D" OR ON STOP LIGHT THE RPM START TO GO BELOW 500 AND THEN IT WILL GO UP TO 700.SOMETIME IT WILL DIE. IF THE RPM START TO GO DOWN I PUT IT TO...


run the fault codes
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when it happens, leave in drive apply the handbrake and take the foot of the brake
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It runs rough sometimes it dies, I have tuned it up , plugs dist cap, wires rotor the computer , It has very poor gas milage .it has a 2300 with automatic trans,


have the intake gasket checked. spray carb/choke cleaner around intake gasket and if rpms change then you have a bad gasket which causes rough idle bad fuel econ

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84 crx starts fine and idles fine in park and neutral, but dies immediatly when shifted to drive or reverse. Will run very roughly if pumping accelerator. What's going on?


You might want to check the engine for a vacume leak.Once the rpm's drop it may have a big enough vacume leak to not keep it running under a load.

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I know this will sound Stupid But, Change the Cap Cap. If the Seal is Bad on the Cap it will allow air Into the Fuel tank and Cause your Rough Idle.

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Mitsibushi montero 1997


when battery is disconnected sometime the system needs to reset itself like the idle speed control goes out of wack. What I recommend is to make sure you didn't know any vacuum hose or any air intake hoses were not broken in the process of replacing alternator. Double check everything and make sure its all in-tact. If all is good then start vehicle and step on accelerator holding RPM at 2500 for 3 minutes, then let go this should reset the idle speed motor. Contact if you need more help. Good Luck

Dec 30, 2008 | 1997 Mitsubishi Montero

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