Question about 1999 Hyundai Accent

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Engine hunting car runs and the engine will hunt when warm after car standing for a while

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If the car is a fuel injected model there are three possible answers.
1/. If the oil is very old it may be affecting the gasses in the exhaust thus causing the Lambda sensor to give incorrect information to the computor-change the engine oil.
2/. Check that the throttle body is clean inside, any tar residue in the body or bypass port can cause hunting.
3/. The coolant temperature sensor may be faulty and giving an incorrect signal to the computor.

Posted on Aug 06, 2008

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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

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

I replaced the governor diaphragm in my 2h in my hj47 1984 ute and now the engine is hunting at idle between 650 and 860 rpm, it doesn't matter if it is cold or warm. Engine doesn't hunt at hi


You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..
This is for car and truck problems related to factory installed systems not add on aftermarket systems.
This post can't be removed or moved, please re-post the question in the correct product category. Thanks

Oct 11, 2012 | Cars & Trucks

1 Answer

1991 Honda Accord Miss-fires dies


I would try replacing the ignition control module and the distributor pickup as the next most likely cause of this problem. Also I would do the following

This problem can be caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control



Jun 20, 2012 | 1991 Honda Accord

1 Answer

Engine hunting


what a lovely car -if it was a manual ,i have a diesel manual one and its a flier ,as for this iam not sure so try reading the codes but if this is a gearbox related fault car then its the scrapyard as this car has no value in the UK but if stuck for spares look here in spain as no end of these cars running around and well appreciated here they are as well .This hunting when cold is the puzzle as it could be gearbox related whereby the gearbox computer is operating the engine RPM idle to stop creep but iam just not sure as i never see any autos of rover just manuals

May 08, 2012 | Cars & Trucks

2 Answers

Rpm hunting


check for a vaccuum leak this is where i would start if it rolled into my shop. possibly a PCV valve sticking or a hole in the hose, this hose should run from the valve cover, or crank case and then to the intake, or carb.

Apr 25, 2010 | 1998 Isuzu Trooper

1 Answer

Engine mgt light stays on all the time, generally runs ok when warm but starts poorly and hunts on idle


You need to get it looked at, get a vehicle diagnostic check done, you can buy the fault code reader off ebay for about £30 then its yours for future cars. Could be one of the o2 sensors failed which is making your car run lumpy which was the problem with my T4.

Feb 23, 2010 | 2000 Volvo S40

2 Answers

Stalling & hunting idle


does throttle sensor check out correctly???

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