Question about 1990 Isuzu Trooper

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Engine hunts and wont idle properly

Engine wont settle and it seems to hunt at times

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If the RPM's fluxuates at an idle at all times you have a bad spark plug or a bad spark plug wire

Posted on May 29, 2009

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Suzuki super carry 1.3 engine revs high low high low high low when clutch is put down engine revs very high


wow no year car stated nor a country x10 worse.
welcome to our USA forum!
the country with ZERO, carry cars. not a one. here
and due to that , no books here nor coverage at mitchells. either.
That is a G13 engine, (not m13) is my 1st guess.
Most Suzuki's with tiny engine and run a map sensors, not MAF
so is called SPeed Density system.

if yes, the that means ALL vacuum leaks cause fast idle.,
armed with that juicy fact, we know why it races.
you never said and actual RPM so no Tachometer?
only 2 causes. a huge vacuum leak
or unlikely the ISC stuck wide open with gunk inside, (clean it?)
ISC is idle speed control.
old suzuki's had man killler ISC software, my 91 did it.
and all others like it........
it would hunt idle like mad with any vacuum leak.(of any kind)
today this is very *******, this mode. (hunt)
toyata cost them $1billion in fines for this same deal.

but Clutch drivers have no problems with idle hunt, "skills"
what year/country.?
please showa photo of engine. ?
and win. a win/win
you win and I win not guessing all that.

fact 2 , is that that hunt tells me the ISC is moving fast.
so is not stuck. (99% says R3PO)
unplug ISC see the hunt end? sure.
the ECU has lost its wits. from..... this....
it sees a massive air leak (vacuum map readings ) and then (dumbblly ) hunts it like mad, (bad Firmware code) but real.
i can demo this is seconds hood up.
causes?
1: vacuum hose fell off.
2: same hose cracked.
3: brake booster diaphragm cracked, sucking air big time)
4: lots more,. even gunk under throttle plate blocking it open.
and more. lots more. can cause lots of vacuum leaks.

Dec 16, 2016 | Suzuki Cars & Trucks

1 Answer

My 4 cylinder 318i e46 bmw starts ok but as soon as it reaches idle rpm it shuts down. the only way to get it to run is to rev the engine to 3,000 to 4,000 a couple of times and then it seems to settl


The Ferrari Mechanic was correct, but you have not yet found the valve. The idle control valve is a small air passageway that bypasses the main throttle plate. You did not say what year of vehicle, but I am assuming it has Fuel Injection since the idle control valve was mentioned. Remove the Throttle body and clean it and all the little air passages in it. Then try. The throttle body is the apparatus between the large rubber air hose and the intake manifold.

Nov 20, 2014 | BMW Cars & Trucks

1 Answer

1993 geo tracker idle up and down


HOT ENGINE? (ill guess hot)
idle surges.(hunts) (very simple reasons or very hard to find.
the car has 2 engines. G16A and G16B
they work totally opposite, (8valve and 16v)
the vin number tells you the engine type ,digit 8 is engine code
6= G16B 16v
U= G16A 8v
i have factory book. its in chapter 0 these facts.
the cause of idle surge and hunt are:
1: ISC failures. the ISC can stick partially open and then hunts.
clean it and test it . see videos of how.
2: engine running so bad the ISC can nOT regulate idle speeds.

#2 is caused by up to 50 reasons.
8v , air leaks, cause racing idle and iSC goes nuts.
16v , all air leaks cause lean and if too lean the ISC goes nuts.

by nuts , i mean it hunts or gives up.

the list is endless, but the tests are basic,
i cant help you because no engine stated.

http://www.fixkick.com/IDLE-AIR/idle-index-home.html


ISC = IDLES SPEED CONTROLER (a system not just a PART)

Jul 08, 2014 | 1993 Geo Tracker

1 Answer

1998 suzuki swift idle problems 4 speed 1300cc


no engine type stated, there are 6 engines used.
but bad idle is caused by 2 things.
  • misfire.
  • or lean AFR, lean fuel mix.. causes HUNTING
the ECU can also cause the hunt if it can not hold hot idle to spec.
most cars is 800rpm.

Jun 26, 2014 | Suzuki Swift Cars & Trucks

1 Answer

Diahatsu Sirion 1998 3 cyl ECU reset


When the battery is disconnected it can cause a corruption in the CPU program. Use a code reader to reset the CPU and go from there.

Jan 29, 2014 | Daihatsu Sirion Cars & Trucks

1 Answer

Engine revs in park


This is called hunting. Can be caused by a bad mass air flow sensor. Could also be a sticking idle air control valve.

Jan 08, 2014 | Nissan Xterra Cars & Trucks

2 Answers

High rev at cold (winter cold!) idle


Your toyota technician should know what a "cold starting solenoid" is. It is the little thing that works your throttle until the motor warms up and something else takes over. I'd suggest going to another technician.

Nov 28, 2013 | 2003 Toyota Corolla

1 Answer

Idle up down


hunting or surging ilde. name the 2 RPMS, low and high , is it hot or cold engine this issue.? 400rpm or 1000 or 2000 all are diff.causes.
no year, stated. so cant help.
but ill answer in the generic,
1: the ECU (got a carb,? )
the ecu controls idle speed at all times.
if not , there is a problem (you)
A: air leaks in the induction will make motor race at some point the ECU/ISC loses control. and hunts. trying hard to correct it.
b: egr stuck open idle too low, iSC cant correct it,, bad EGR.
c: engine EFI running way too leak starving for fuel so it hunts for 2 reasons < ISC hunting, and lean does that.
lean is gross power loss and opening throttle bogs the engine.
so is double bad. ISC makes it worse,

all this breaks down to 2 reasons.
1: ISC bad. in some way (gummed up. or restricted inside)
2: bad fueling or air leaks. vacuum leaks.

try answers , the hot cold question and the 2 speeds, of the hunt.
lowest rpm and highest of the hunted range of RPM.

Nov 23, 2013 | Honda Civic Cars & Trucks

1 Answer

REAR SUSPENSION SETTLED ALL THE DOWN


You likely have a leaking air bag in the suspension, they last about 100,000 miles on average. Have a shop test the bags for leaks.

Aug 08, 2012 | 1999 Lexus LX470

1 Answer

I have a 4.3 engine wont start in morning unless i pour gas in throtle body wont give a shot of gas when i turn on key but will start all day after first start in morning


without knowing the year, make,model,and mileage it sounds like you have a partially blocked fuel filter. the problem occurs after the vehicle sits for long periods of time such as overnight. the trash in the filter has time to settle and block the fuel line so the engine doesn't get the fuel it needs to start. by pouring gas into the engine you are allowing the engine to start and pressurize the fuel system and force the blockage out of the way enough to allow fuel to the engine, as long as you start it up every so often the the trash in the filter cant settle enough to restrict fuel flow. this will be a very good place to start looking for a fuel flow issue.

Apr 03, 2011 | Chevrolet 1500 Cars & Trucks

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