Question about Mitsubishi Montero Sport

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I put rapid fire spark plugs in and the manual calls for standard, would this cause a small vibration at idle?

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Aslong as you did not damage or bumb the sparkplug heads ok

Posted on Oct 12, 2010

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Code 300 is for a random miss-fire.
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My 2004 Neons electical system pulsates. Headlights, dash lights, etc all go slightly from bright to dim. Occasionally all the gauges will flutter rapidly. Seems to idle too low at stop lights 5-600 rpm)...

hi it sounds like it could be your alternator i think you call them generators in the US, try testing it with a volt meter, connect it to the battery and start car, if it puts out 13 to 13.5 volts on idle and 14 to 14.5 volts when you rev the engine it is ok, anything under that or even over that meens that it is faulty hope that helps

Feb 13, 2010 | 2004 Dodge Neon

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Jeep just had head gaskets put on. its miss fireing between cylinders 3 and 5. motor has vibration n exhaust is makin poppin noise . what could cause this

The easiest thing is to make sure the firing order is correct with the spark plug wires. You may have 5 and 3 spark plug wires crossed. Also, was this vehicle running ok before the head gasket repair???

Jan 16, 2010 | 2001 Jeep Grand Cherokee

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When it idles it acts like its missing I put

Check and make sure your distributor cap and rotor are not corroded and gunked up. If a spark plug is ever dropped, the center electrode could be cracked leading to a improperly firing spark plug (causing a misfire). parts get dropped during shipping all the time.

good luck!

Nov 18, 2009 | 1993 Nissan Altima

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My car does not idle properly,when i start the car its ok but when i put the car in drive it starts to vibrate,when the car is moving it does not vibrate as i slow down or come to a stop it vibrates agnin,

Check your spark plug wires check if there in properly on. Another problem when a car idle check for any small vacuum or air leak from a hose.

Apr 05, 2009 | 1999 Hyundai Accent

2 Answers

94Metro Has a bad vibration at idle, gets worse in gear stopped

check all motor mounts first. if they are ok then check to make sure all cylenders are firing. try pulling one plug wire off the spark plug and see if the engine changes sound or anything. if it does, put the wire right back on then move to the next one and repete. if you pull one and it does not change then that plug is not firing. could be caused by a crack in the porcelian in the plug or bad plug wire connection or bad wire

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1 Answer

Miss firing

could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.

Nov 27, 2008 | 1994 Ford F150 Styleside Supercab

1 Answer

My 1998 chevy truck 1500 vibrates so bad when i stop or when idle

You left out a lot of needed information but I will try to help out.
You can pull the spark plug wires off one by one while the engine is running to see if you have one or more cylinders are not firing. Depending on how long it has been I would do a tune-up first, replace spark plugs and wires, filters, fluids etc.
With that done and if all cylinders are firing pull the transmission dip stick and look at the fluid, I am assuming you have an automatic tranny. The fluid should be a light red, if it is brownish and has a burnt smell then you could have a problem with the clutches inside your transmission which can cause this same problem.
Good Luck.

Nov 23, 2008 | 2000 Chevrolet Silverado 1500

1 Answer

93 cavalier vibrating

your probably feeling a rough idle of the engine. need a tune up?

in park the engine is not loaded down, just idling at a low rpm=rough
in drive with brake on you have put some load on motor also at low rpm=rough
in drive on the road engine is at higher rpm, = smoother

generally 4 cylinder motors idle a bit rough, especially if one spark plug is not firing right or fouled or one bad spark plug wire. tune up may fix it. if it is not stumbling real bad or stalling then you can live with it.

Nov 22, 2008 | 1999 Chevrolet Cavalier

1 Answer

Runs rough and vibrates when idling

make sure the firing order is ok, that means every plug wire belongs to a specific spark plug and can't be swap to another
if the do not help then reinstall the old distribuitor cap and see if that cures the problem i have seen some aftermarket caps arking internally
also doble check spark plug for loose and retie

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