Question about 1993 Honda Prelude

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Idle problem when car is in neutral sometime it idles at 1000 and other rime at lie 600 or so have no idea what the problem is dont even know where to start some help would be great

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  • stevenasmar6 Jan 26, 2009

    battery brand new but not sure about alternator

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Is your battery is in good condition also check your alternator load is correct....

Posted on Jan 23, 2009

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I have a 99' bmw 323ic and my problem is it idles erratically and when it does it starts to lose power. Any Ideas?


hi there,

it sounds like one of three problems a faulty knock sensor/throttle position sensor/or idle valve sensor

sadly only way to know is diagnostic check up and see the fault code

Jan 18, 2012 | 1999 BMW 323i

1 Answer

My pontiac engine get dead every time i release the gas pedal or slowing down even in neutral, i tried to look for idle adjustment but i dont know where it is located. also sometimes the gear is stock up...


Don't try to adjust the idle speed. Very very bad thing to do. Have your idle air control unit checked. Probably shot, or carbonrd up. Also have your throttle body cleaned.As far as the shifting goes, have the shifter interlock checked. These are both things that are better left to pros, as the diagnosis requires special equipment, and information.

Aug 14, 2011 | 1993 Pontiac Grand Prix

1 Answer

My car shakes at idle speed of 800 rpm, doesn't


old engine mounts can cause that problem, even if they look ok sometimes

Apr 20, 2010 | 1994 Toyota Land Cruiser

1 Answer

Idle control


tps (throttle position sensor) controls the idle and the ideal idle is around 700-850

Oct 01, 2008 | 1987 Nissan Pickup

1 Answer

High idle


I have the same exact problem, but with idling roughly between 700 and sometimes upwards of 2000+ RPM.  I don't have the problem you do as far as the engine heat goes, but I definitely feel the tug, hear the engine sounding bogged down at stops, and when in neutral, finding it idling extremely high.  My check engine light had come on just this past month (with this problem occuring for a little over a year now), and it turns out I have a bad Throttle Positioning Sensor, which my mechanic says can cause the high idling.  I'm replacing the sensor this weekend with a dealer part, which I got for $102, so I'll post again once it's done to let you know if that fixed the problem or not.
Hope this helps,
Dan e-mail: dkisme2@hotmail.com

Sep 24, 2008 | 2000 Subaru Legacy

1 Answer

Turns off


Tach is short for tachometer and is a device that tells you the speed of the engine, generally in RPM X 1000. A typical speed for a 6 cylinder engine is about 600 to 1000 for idle in Park/Neutral, and 500-800 in Drive or Reverse. This was if you have this on your dash, and can get me some numbers, I can better assist you...accordianman

Jul 28, 2008 | 1988 Chevrolet Camaro

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