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this is a USA form and we dont have Balenos,
but do have lots of G16b (16valves)
that is called hot idle speed hut, its a software bug, in the ECU.
this same bug cost toyota 2bill bucks in fines. but not suzuki nobody cares. on them.
a barn find car, done many, too many.
That sure can be many things but in order its clear.
THE ISC is failing , in fact its doing the hunting, if you unplug its 2wires, it stops hunting.
the cause is really air leaks, the ECU is programmed to hold hot idle at 800, rpm , if it cant. it ILLEGALLY hunts it.
a lreal car, would just send the valve closed command over and over and not hunt it, as hunting can kill, drivers with bad skills.
First car i saw this on was a 91, Vitrara, Sidekick. G16a.
then a 96 G16b,
you have a vacuum leak.
that is the cause.
and I bet lots more ... for sure, last one like that I did had 15 majors.
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.
The most common causes for "idle hunt" is a dirty throttle body or faulty idle air control valve. The computer uses the control valve to regulate idle speed. There could also be a vac leak somewhere.
The battery could still be bad and if you don't have a totally good battery in the car it won't run right. Take to one of the parts stores and they can check it for you for free. Probably as simple as a battery.
I had the same on a customers car, 5 years and $$$ in a dealer later I was given a shot, the factory mis fitted a manifold gasket and it was sucking in air, I used a length of screenwash pipe to listen under the inlet manifold and found it.
engine lite on? would ck to make sure there is plenty of coolant in system. low coolant may cause idle hunting. also could have a vacuum leak or air intake restriction. ck air filter
Sounds like it could be losing fuel pressure to the rail, try turning ignition on for 10s, then off then on then off then try start. That should make sure the pump has pressurised so will see if it is pressure.
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