Question about 1989 Isuzu Trooper

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My trooper when it warms up it idles up and down?

The engine revs from 1000 rpm to 2200 rpms every time you mash the clutch.

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  • gladiator_44 May 04, 2009

    I have the same problem and was told it was a vaccum problem but he couldn't find where it was after 4 hrs

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These Isuzu engines will automatically raise the idle RPM when they begin to run hot... this is done to increase the cooling fan speed for more air flow thru the radiator..... is your temperature gauge showing above normal ...? if so, check your cooling system... I put a 160 degree thermostat in mine. (was 180)

Posted on Apr 23, 2009

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Check EGER valve and vacume hoses..

Posted on Feb 16, 2009

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2007 V8 diesel sport. Missing badly at idle (650 RPM) when cold, runs smoothly if revs raised to 1000 RPM. Does not appear to miss under full power, and will generally run smoothly at idle when warm.


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have them serviced and raise the idle to 750 rpms as the lower idle speed may not be raising the combustion pressure temperature to ignite badly sprayed fuel ( diesel has to be atomized not squirted )

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1 Answer

1997 acura cl 2.2 revs up to 1500 rpm and down to 1000 rpm just several seconds after start


Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

Mar 16, 2014 | Acura Cars & Trucks

1 Answer

Where is the slave cylinder on a 2005 suzuki forenza


M/T car with a clutch
the slave is the device that pushes the clutch lever , as it enters the clutch bell housing (the hunk of alum. that is between the engine and trans 'bell shaped..)
400 or 4000? , my guess is you mean, 4000 rpm
3000 on the round is normal./
the engine should idle at 800 rpm.
that is just 1 tick below the 1 (1 = 1000 on the scale see the 1k or
x1000 on the dial, that means all numbers are times 1000.
so point 8 rpm is 0.8 x 1000 or 800.

do not ride the clutch pedal or you will buy many a clutch.
the save bad, never cause, slipping clutch. (near impossible)
the hyd, clutch actuator is self adjusting as clutch wears.
the clutch will grind gears if the slave fails. the slave annoucces its bad in advance buy loss of fluid on ground and level drop on the cutch master cylinder.
post the symptoms, and ask for help based on those facts.
a slipping clutch is a bad clutch. (or soaked in oil, and same )
please repost real RPMs using the x1000 scale factor for best answer
and when they happen.

Feb 12, 2013 | 2005 Suzuki Forenza Wagon

1 Answer

When car is idle it will rev from 2000 rpms to 1000 rpms and it will do so for a little bit. but after car has been driven awhile it runs fine.


You have a vac leak. It's related to cold vs hot. Possibly throttle body gasket. IE: when it warms up the metal expands and seals the leak, when cold it contracts and exposes leak.

Jan 03, 2011 | 1994 Isuzu Trooper

2 Answers

When in park honda odyssey revs up and down between 1000 and 2000 RPMs


is the check engine light on also? it sounds like the idle air control valve is bad. this controls the idle of the vehicle. when it is stuck open it causes too much air into the engine and causes it to rev. when it gets to a set rpm, the pcm cuts fuel. then it turns the fuel back on, then the engine revs, then it cuts fuel........code p0505 will prob be set

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1 Answer

The engine rpm's increase when the engine gets warm.


spray a samll amount of either near each vacum line connection if the rpms go up theres your leak!!

May 30, 2009 | 2005 Mitsubishi Lancer

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